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Operator
Greetings, and welcome to the U.S. Silica Third Quarter 2017 Earnings Conference Call. (Operator Instructions) As a reminder, this conference is being recorded. I would now like to turn the conference over to your host, Mr. Michael Lawson, Vice President of Investor Relations and Corporate Communications for U.S. Silica. Thank you. You may begin.
Michael K. Lawson - VP of IR & Corporate Communications
Thanks, good morning everyone, and thank you for joining us for U.S. Silica's Third Quarter 2017 Earnings Conference Call. With me on the call today are Bryan Shinn, President and Chief Executive Officer; and Don Merril, Executive Vice President and Chief Financial Officer.
Before we begin, I would like to remind all participants that our comments today will include forward-looking statements, which are subject to certain risks and uncertainties. For a complete discussion of these risks and uncertainties, we encourage you to read the company's press release and our documents on file with the SEC. Additionally, we may refer to the non-GAAP measures of adjusted EBITDA and segment contribution margin during this call. Please refer to yesterday's press release or our public filings for a full reconciliation of adjusted EBITDA to net income, and the definition of segment contribution margin.
Finally, during today's question-and-answer session, we ask that you limit your questions to one plus a follow-up to ensure that all who wish to ask a question may do so.
And with that, I will now turn the call over to our CEO, Mr. Bryan Shinn. Bryan?
Bryan A. Shinn - CEO, President and Director
Thanks, Mike, and good morning, everyone. I'll begin today's call by reviewing highlights from what I believe was an exceptionally strong performance in the third quarter, followed by an update on various strategic initiatives underway to create customer and shareholder value, and generate dependable growth from a continued position of strength. I'll conclude my prepared remarks with a market outlook for the remainder of this year and our initial views on 2018. Don Merril will then provide additional color on our financial performance before we open the call for your questions.
Third quarter revenue of $345 million improved 19% sequentially. Adjusted EBITDA was a record $96.7 million, and increased 29% sequentially. Very strong demand in our oil and gas sand business drove record sales volumes, up 3.1 million tons, up 15% on a sequential basis with capacity utilization running at almost 100% during the quarter.
Pricing gains continued, with mine gate pricing up over 5% sequentially. Sandbox also had a very strong quarter, continuing to rapidly build out and deploy new fleets to satisfy increasing customer demand and gain market share. Sandbox revenue grew 18%, primarily by adding new crews and equipment while increasing prices across the network. We exited the quarter fully-utilized, with 52 crews online, and subsequent to the quarter we grew to 58 crews in October. We believe Sandbox is currently the number 1 non-pneumatic solution for last-mile logistics, based on recently-announced competitor earnings.
Our total oil and gas business saw a 35% improvement in contribution margin to $96.1 million, driven by a combination of higher volumes and pricing, productivity improvement, and continued growth in Sandbox. During the quarter, we signed five new long-term supply agreements for both northern white and Permian local frac sand. These contracts are 2 to 3 years in length on average, and many were accompanied by a capacity reservation prepayment. To date, customers have signed contracts with approximately $75 million in prepayments, and we expect to exceed a total of $100 million in prepayments once we complete several other contracts that are in various stages of negotiation.
Given the number of contracts that we're signing, I expect that our percent of contracted sales for frac sand over the next few years will be substantially above 50%.
Also during the quarter, we completed the acquisition of Mississippi Sands, a regional sand producer with 1.2 million tons of low-cost, mostly fine-grade capacity, with a multi-modal distribution network that has very low landed cost into the Haynesville, Northeast and other key markets. The integration and projected synergies from the acquisition are tracking ahead of plan, and as expected, the new operation was accretive to our third quarter results.
Turning now to our industrial and specialty products segment, revenue in the quarter of $58.7 million improved 6% sequentially. Contribution margin for ISP reached a record $24 million, driven by a combination of strategic price increases and a mix of higher-margin products sold during the quarter, including cool roof granules. Operationally, we continued to drive down our production and logistics cost through numerous improvement efforts.
As you may recall, we used our best-in-class balance sheet during the downturn to invest in various projects, to de-bottleneck plants, automate processes, improve load-out times, and streamline our operations. As a result, our production and logistics costs per ton set new record lows during the quarter.
Let me now turn to an update on our capital allocation plans and recent activities. Investing in high-return growth projects continues to be a priority for us. As previously announced, we're on track to bring an additional 10 million tons of brownfield and greenfield capacity online in oil and gas by the middle of next year, increasing our total annual oil and gas production capacity to 23.5 million tons. Our expansion strategy in West Texas centered around providing a critical competitive advantage in the Permian, and that's having the shortest drive times from our mines to customer well sites. With La Mesa, located in the northern part of the Permian, and Crane County to the south, we expect to have substantially shorter delivery times to most wells in the Midland and Delaware basins compared with competition.
Also, as announced subsequent to the end of the quarter, we were pleased to receive a certificate of inclusion into the Texas Conservation Plan, or TCP, for the Dunes Sagebrush Lizard. Being part of the TCP helps preserve DSL habitat and is consistent with our decades-long company commitment to sustainability and environmental responsibility. Further, being part of this plan helps assure future operations at our new Crane County facility and is important to many customers when selecting suppliers for in-basin Permian sand.
We do not currently have plans for investment in new frac sand capacity beyond what we previously announced. We will, however, continue to invest substantially in Sandbox and in select ISP growth projects, given the attractive returns and as always, we'll look for favorable opportunities to consolidate the frac sand space.
As part of our capital allocation plan, we'll also continue to return cash to shareholders, in the form of a quarterly dividend, and today we are announcing a new, larger, $100 million share repurchase program which was recently authorized by our board. U.S. Silica is the only company in the sand space that has had the financial strength and flexibility to continually pay a dividend, fund substantial growth projects, complete accretive acquisitions and do share repurchases, all while maintaining our industry-leading best balance sheet.
Let's move now to our outlook, starting with the near term. We expect sand volumes to be up in oil and gas for Q4, but perhaps restrained by some frac crews that may extend their holiday time off. Also, plant downtime due to planned maintenance and brief outages for capacity expansion work at a few mines. We do expect to see continued pricing upside in oil and gas during the fourth quarter. Contract interest is at an all-time high, and we will continue to prioritize customers with capacity reservation fee contracts and long-term partners in this tight market.
For Sandbox, we expect strong growth and plan to increase from the 58 crews online today to 70 active crews by year-end. In ISP, we expect volumes to be down due to the normal seasonal slowdown in that business, and we also expect price to decline slightly for ISP in Q4, due to unfavorable mix as some higher-margin customers manage year-end inventories.
Turning to our outlook for 2018, we're forecasting total industry demand for frac sand to be in the range of 90 million to 100 million tons, assuming a recount that is essentially flat with today's levels, and profit per well up 15% to 20% year-over-year. We believe that approximately 45% of that demand will come from the Permian, where perhaps 25 million to 30 million tons could come online by 2018 year-end. However, that's far from certain given all the challenges, and we believe that new capacity will come online slower than expected, resulting in a tighter 2018 market with higher pricing than many are modeling.
Furthermore, we anticipate that trucking logistics will become a critical issue in the Permian, as new mines come online in disadvantaged locations served by secondary and tertiary roads. Customers are increasingly concerned about this issue, and are telling us that we're best positioned to serve them with our mine locations and Sandbox delivery system.
We're in the final stages of putting together our capital budget for 2018, and expect to invest substantially in Sandbox growth. We believe that Sandbox is positioned to support well over 100 frac crews by the end of 2018. More broadly, in oil and gas, we expect to remain mostly sold out of frac sand across our network in 2018 at attractive pricing given our strong contract portfolio and best-in-class combination of mines and logistics footprint.
ISP, which has grown contribution margin at a 10% CAGR for the last five years, is expected to continue that trend in 2018 with increased market penetration of new, higher-margin products, like our cool roof granules, and also through the introduction of additional, attractive new products. From an end market perspective, housing starts, which drive a significant part of the ISP business, are projected to be up nearly 5% according to the National Association of Homebuilders. Finally, we're looking at some very interesting M&A opportunities in the industrial space, some of which are significant in size and could potentially move the needle from a revenue and profitability standpoint.
And with that, I'll now turn the call over to Don. Don?
Donald A. Merril - CFO and EVP
Thanks, Bryan, and good morning, everyone. I'll begin by commenting on our two operating segments, oil and gas and industrial and specialty products.
Revenue for the oil and gas segment for the third quarter of 2017 of $286.4 million, improved 22% sequentially compared with the second quarter of 2017, driven by a combination of higher volumes including our acquisition of Mississippi Sands, higher pricing, and the continued growth of Sandbox.
Revenue for the ISP segment of $58.7 million was up 6% on a sequential basis from the previous period, driven by volume increases and strong contributions from new, higher-margin products.
Contribution margin on a per-ton basis from our oil and gas segment was $30.54, compared with $25.94 for the second quarter of 2017. The improvement in oil and gas CM per ton was primarily driven by higher pricing, increased fixed cost leverage, and higher activity levels at Sandbox.
On a per-ton basis, contribution margin for the ISP business of $25.84 improved 5% from the same period of the prior year, driven largely by higher pricing and a better mix of higher-margin products sold during the quarter.
Turning now to total company results, selling, general and administrative expenses in the third quarter of $29.6 million were up 14% sequentially compared with the second quarter of 2017. The sequential increase in SG&A is largely due to increased compensation expenses related to headcount to staff the growth in the business. For the fourth quarter, we anticipate our SG&A will be in the $30 million range.
Depreciation, depletion and amortization expense in the third quarter totaled $24.7 million compared with $23.6 million in the second quarter of 2017. The increase in DD&A was driven by incremental expense related to our capital spending, and higher depletion costs associated with more tons sold. DD&A for the fourth quarter 2017 is expected to run about $25 million.
Moving further down the income statement, interest expense for the quarter was $8.3 million. The effective tax rate for the 3 months ended September 30, 2017 was 26%. Our estimated full-year 2017 tax rate is approximately 23%.
Now, turning to the balance sheet, cash and cash equivalents as of September 30, 2017 was $463.7 million compared with $711.2 million at the end of 2016. As of September 30, 2017, our working capital was $560.8 million, and we have $45.2 million available under our revolving credit facility. As of September 30, 2017, our total debt was $511.3 million compared with $513.2 million at December 31, 2016.
During the third quarter, we incurred capital expenditures of $130.7 million, primarily associated with our previously-announced Permian basin growth projects and other maintenance and cost improvement capital projects. As stated in the press release, the company anticipates full-year 2017 capital expenditures to be at the high end of our second quarter guidance, or approximately $375 million.
And with that, I'll turn the call back over to Bryan.
Bryan A. Shinn - CEO, President and Director
Thanks, Don. Operator, would you please open up the lines for questions?
Operator
(Operator Instructions) Our first question comes from the line of Ole Slorer with Morgan Stanley.
Ole Henry Slorer - Global Head of Energy Research, MD, and Oil Service and Shipping Analyst
Could you talk a little bit, Bryan, about kind of your total overview of the U.S. sand markets? You talked about signing contracts on pretty good terms, both for northern white and for regional sands in West Texas. I mean, you're taking a holistic approach by the looks of things and kind of going after everything. So could you tell us a little bit at a high level over the next 12 months, how you sort of see the dynamics play out? Will you talk about your customers about what they want, particularly maybe West Texas customers, and then maybe also talk a little bit about customers elsewhere? Will it come to the mix between all your different products and how you see them interact, particularly on the oil and gas side, of course?
Bryan A. Shinn - CEO, President and Director
We see robust demand in 2018 across the frac sand sector. We believe that we'll be somewhere between 90 million to 100 million tons of total demand, and you can calculate that a number of different ways. One of my favorites is, and it's probably the simplest, is just to look at frac crews. So today, our frac crew tracker has about 396 crews active across the U.S., and we expect that number is going to grow, and many people are saying maybe 450 frac crews next year. So a frac crew typically consumes about 225,000 tons per crew, or at least we think it will in 2018. So that kind of gets you towards the top end of the range of that 90 to 100. There's a couple of other ways to calculate it, but it looks like demand is going to be very robust in '18. And as we talk to our customers, I think they're preparing for that. What we're seeing is heavy, heavy requests for contracts, probably almost more than what I saw in 2018, quite honestly. We have more contracts now than we've ever had, and more demand for contracts. And I think particularly to your question, in West Texas, the kind of demand that we've seen there from our customers for our supply out of Crane and La Mesa, has really been overwhelming. And I think it's because we have well-positioned those two sites, so that we not only have great product and kind of bracket the Permian, but we've been very sensitive to logistics. And as I mentioned in my prepared remarks, I think the tightening of logistics and logistics bottlenecks in the Permian is going to be one of the stories of 2018, perhaps maybe the story in the sand market. And I think it's going to have knock-on effects in the completions industry for sure, and if we talk to our customers, they are very keenly-focused on last-mile logistics and how all this sand is going to move around the Permian. And I think it gives us a very strong competitive advantage there.
Ole Henry Slorer - Global Head of Energy Research, MD, and Oil Service and Shipping Analyst
Interesting, so clearly I'm sure you've noticed sort of the Wall Street panic over the past six months with respect to this adding up all the nameplate capacity in West Texas, and kind of concluding that the whole sand space will go in for a choppy ride in 2018. What do you think is the biggest difference in your view and this view, based on your conversations with your customers?
Bryan A. Shinn - CEO, President and Director
So we're on the ground looking at everything that's happening in West Texas, and our customers are as well. And what we have seen is that a lot of the capacity expansion plans are slowing. I don't think the mine site is going to come up nearly as fast as people believe, or as many folks have modeled today. Probably my favorite quote was from one of our customers who went out a couple of months ago and did this tour themselves to sort it out, and they came back and told us that what they saw in most of these sites was a wooden shack at the end of a long dirt road. So there just wasn't a lot going on. Now, we believe, as I think most do, that some capacity will come up, but the folks who are out there doing it right now and trying to get mines up are finding that it's much harder than they thought for a variety of reasons. So I think the capacity is going to come up slower, it's going to be much harder to bring on, Ole.
Operator
Our next question comes from the line of Marc Bianchi with Cowen.
Marc Gregory Bianchi - MD
Thanks. Maybe just following up on the last question from Ole, as it relates to all this supply that could potentially come on, it sounds like if it's just deferred for say a quarter or two, that doesn't remove necessarily the overhang that may be on the stocks, and not in the industry. What are you looking for, to really show that that new capacity may not come on at all? Or may not come on in a fashion to enable the prices to have a material impact? So it's kind of a timing question, but just curious for your thoughts there.
Bryan A. Shinn - CEO, President and Director
It's a really good question, Marc, and I tend to think about it from a customer's perspective. So what drives all of this is customer demand, and I feel like the jury is still out on the Permian Sands and how many customers are going to accept that. So irrespective of all the expansion plans and things that might be out there from a variety of different companies, what really matters most is how customers see this. So I was having a conversation with a very senior team at a customer a few weeks ago, and they said, look, the jury is still out for us. We're still doing a lot of technical evaluations. We're not sure about the long-term well results, etc., etc. So I think there's a chance that there's a bit of a bifurcation in the industry, so there's some customers who really like and feel like the local sands work well, and others that don't. I would say the other thing that could be a big restraining force here, and we're going to see it hit full force in 2018, is just the logistics bottleneck and all the issues that are going to come up, particularly for the mines that are being built in and around the Winkler County area. We had an associate that was out there a couple weeks ago, and he said he had to wait 45 minutes at one four-way stop because of all the truck traffic. That's just one example of the kind of bottlenecks and issues that are there. And, to the extent that limits customers from getting product in a timely fashion or significantly increases the logistics cost to deliver the product to the wellhead, I think that also could restrain some of the enthusiasm for local sand.
Marc Gregory Bianchi - MD
I wanted to switch over to the reservation fees that you're talking about now, and maybe this is a question for Don. Is the accounting for those reservation fees, is that matched with volumes, or how should we see that flowing through the incoming cash flow statement?
Donald A. Merril - CFO and EVP
A: Yes, it's exactly matched with volumes. We account for it as deferred revenue, so you'll see all of that show up on the balance sheet and then as people buy the volumes you'll see it go through the income statement.
Marc Gregory Bianchi - MD
Okay, so fair to say not much realized in the third quarter?
Donald A. Merril - CFO and EVP
That's fair, yes.
Operator
Our next question comes from the line of Jim Wicklund with Credit Suisse.
James Knowlton Wicklund - MD
Bryan, you said you've hit your capacity additions that you had planned, and you don't really have any capacity additions planned for '18. Your buyback is only $100 million when you've got a chunk on the balance sheet. So are we just being conservative? Is there consolidation in the industry a possibility, can you talk to us about use of capital other than for expansion of Sandbox in '18?
Bryan A. Shinn - CEO, President and Director
Certainly, Jim, and I think the thing I love about our balance sheet is that it gives us flexibility. My belief is, as you said, that we're going to continue to invest substantially in Sandbox. There's some really interesting opportunities on the industrial side of the business. We're still actively pursuing consolidation within the sand space, and so I think that is a possibility. But of course, returning cash directly to shareholders is as well, and as we noted in our prepared remarks, we're the only company in the industry that's consistently paid a dividend, bought back stock, done accretive acquisitions, and been able to invest in growth. And so we like having that sort of optionality, but to the extent that we can't do consolidation or some of the other things that we might like to do, we certainly have the capability to continue with increasing share buybacks.
James Knowlton Wicklund - MD
Perfect answer, and the market will be thrilled to death over your $100 million this morning. And my follow-up, if I could, there's concern -- I know that a lot of people you don't think that all the West Texas capacity's going to come on. There's some thought that if the Permian is 45% of the 100 million and you look at just 100-mesh, then it may be that by the end of '18, the Permian is either fully-supplied locally or even possibly over-supplied. Do you agree with that as a possibility, and would you rather if somebody came and said, gosh, I've got a sand mine for sale, would you be more interested if it was in West Texas? Or would you be interested more if it was someplace else?
Bryan A. Shinn - CEO, President and Director
So I think there's definitely a possibility that the market could be self-supplied by the end of '18, depending how fast some of the capacity comes online. The good news for us is, we play in all the basins, and one of the interesting facts -- we talked about all these contracts that we've signed and the others that are coming. A lot of the ones that have been signed and are in the pipeline are for northern white sand. So I think the death bell on northern white sand has been prematurely rung. Customers had a lot of desire for those products. Some of those contracts, believe it or not, are still in the Permian, but we have all the other basins as well. So I think it's one of the advantages of U.S. Silica, is that we have this diversification. And then with Sandbox on top of that, we have the ability to really economically get product almost anywhere, to any well site in the country, and it gives us great advantages.
James Knowlton Wicklund - MD
If I was an E&P company looking for surety of supply, I would much rather sign a contract with somebody with multiple mines in multiple locations, than just one. That's easy. Thanks guys, very much.
Operator
Our next question comes from George O'Leary from TPH & Company.
George Michael O'Leary - Director, Oil Service Research
Sticking on the prepayment line of questioning and just given what you were talking about, about folks still having the desire to sign northern white contracts, I was curious if you could provide a little color around, of the $75 million in reservation fees or prepayments that you have, what the mix is of that between regional versus northern white sands, or if it's more grade-dependent? Just curious how that's set up, and then maybe any color on the mix of those contracts would be helpful.
Bryan A. Shinn - CEO, President and Director
So it's a little bit difficult to break it apart because some of the contracts that we've signed include both regional and northern white sand. So it's kind of a mix, quite frankly. I would say that in terms of product mix, that the industry is looking for right now, certainly we've seen completions trend towards using more of the finer products, so 40/70, and 100 mesh are typically in greater demand than our coarser products, the 20/40 and 30/50. 20/40 is probably the product that's in least demand, but even with that said, we've been able to keep that product essentially sold out as well. I think it speaks to the overall demand in the market today, which is very strong and I believe it's going to go up substantially in 2018.
George Michael O'Leary - Director, Oil Service Research
Great, and then just one more from me. As we look forward to Q4, you guys gave some kind of qualitative guidance. I was just curious if you could provide any more color around the magnitude of the volume increase, and then if not there, maybe the mine gate price increase you guys are expecting? And then, how much Sandbox is going to contribute to contribution margins? So just any more quantitative color you could provide on the Q4 outlook would be super helpful.
Donald A. Merril - CFO and EVP
I think from a volume perspective, you're probably looking at a little bit up on the volume side. You've got a lot going on in the fourth quarter. We've got some capacity coming online, but we also have all the things in the fourth quarter that we always tend to forget about, like weather, and holidays, and things like that, that will affect it as well. Pricing, we are seeing a little bit of a price uplift as we walk into the fourth quarter. I would say it's going to be in the low single digits right now is probably what we'd see there, and Sandbox of course is continuing to grow. As we go from 52 crews, I think right now we're sitting at about 58 crews on our way to 70, so you're going to continue to see the uptick from Sandbox in the fourth quarter.
Operator
Our next question comes from the line of Scott Gruber with Citigroup.
Scott Andrew Gruber - Director and Senior Analyst
The contracts you're signing today have more teeth than what we saw last cycle, but the sustainability of these contracts is still a concern for investors. Can you just provide some more color, Bryan, on the strength of these contracts? The prepayments are clearly great, but the more color on how these contracts differ from last cycle and why they should be stickier than what we saw last cycle?
Bryan A. Shinn - CEO, President and Director
It's a good question, and as you can imagine, we've thought a lot about this. This is probably our Gen 4 contract if you will, and the thing I love about the capacity reservation fee and the way those contracts are structured, is that we get to take those prepays to earnings on a quarterly basis whether any tons get consumed or not. So if a customer buys tons, the prepay gets credited against that. If they don't, then we get to take that to earnings anyway. So I think that gives customers a real incentive to purchase the tons. So I think that's been a big learning for us. I think also the contracts that we're signing that are not capacity reservation contracts, we kind of have our choice of dance partners, if you will, given the demand for contracts right now. And so you can imagine that we're picking the kind of bluest-of-the-blue chip customers to sign with. So I feel really good that a higher percentage of our customer base will continue to be pumping, for example, on the service company side, even if the market turned down. So I would personally, as I look across our contract portfolio, feel much more confident around how we'd react in a downturn in terms of profitability and our ability to sustain these contracts as compared to probably almost any other time in the last 7 or 8 years, as we've really gotten into all this.
Scott Andrew Gruber - Director and Senior Analyst
Got it, and Bryan, when you listed your priorities for cash deployment you didn't mention any other greenfield projects in oil and gas. So just to be clear, is it fair to say that you're de-emphasizing additional greenfield projects, prioritize brownfield and then do some M&A?
Bryan A. Shinn - CEO, President and Director
So at this point, we don't have any other greenfield projects contemplated as we look at say, 2018. I feel like we'll be able to satisfy the needs of our customers and the industry demand with what we have on the board right now, and we're focused at this point much more on investing aggressively in sandbox to continue to take share there, focused on the ISP business, and making sure we have enough cash on the balance sheet to continue to do the kind of attractive M&A that we've done over the last couple of years.
Operator
Our next question comes from the line of Michael LaMotte with Guggenheim.
Michael Kirk LaMotte - Senior MD and Oilfield Services Analyst
Bryan, a couple of times you've mentioned being sold out for 2018, effectively 100% capacity utilization. I assume that includes Cadre, as well?
Bryan A. Shinn - CEO, President and Director
Yes, so that's basically across our network and when I think about being sort of essentially sold out, what that means in my mind is for the grade that's probably in least demand, which is 20/40, we think we can be sold out of that. But, there may be an occasional day or week where there's not a lot of demand for that. But, we also have the option in most of our mines to move products to the industrial business as well, and to kind of absorb just the ups and downs in the market. But, I'd expect that we'd be about as close to sold out as you could possibly get.
Michael Kirk LaMotte - Senior MD and Oilfield Services Analyst
Okay great, and then has the pricing around Sandbox, that's two quarters in a row now that you've talked about pricing moving up. I'm curious about contracted versus spot exposure in Sandbox, and if there have been any changes in the contracting model there that could lead to a change in the rate of change of price improvement in Sandbox over 2018?
Bryan A. Shinn - CEO, President and Director
So we have signed several new contracts at Sandbox and there's more on the way. I think given that over the last 12 to 18 months, Sandbox has been kind of a new solution out in the industry. Customers wanted to really take a look at it, and make sure that it made sense for them. I think what we found is almost universally once a customer tries Sandbox that they never go back, and some of our larger customers who have tried Sandbox are now asking for several new fleets. So I think there'll be more growth there, there'll be more contracts coming. I feel very good about the portfolio that we have of customers. And if you really step back and think about it, over the next couple years, pneumatic trucks as a way of transporting sand in the last mile, are just going to go away for a variety of reasons, not the least of which is regulatory-driven. So all that share of the market out there that pneumatics has is kind of up for grabs. And I think that Sandbox will get more than our fair share of that as we go forward, here.
Michael Kirk LaMotte - Senior MD and Oilfield Services Analyst
Maybe another way of asking a pricing-related question is, are you benefiting from the inflation that we're seeing in pneumatics? Is that giving you some pricing power in Sandbox?
Bryan A. Shinn - CEO, President and Director
It definitely is, and as trucking becomes more expensive, the delta between Sandbox and pneumatics goes up dramatically. So if you think about the amount of truck time that it takes to deliver a load of sand, with the Sandbox system versus pneumatics, in many cases it takes an extra 30% to 40% of the time for the truck to do what it needs to do if it's a pneumatic truck. So every time the rates go up in trucking, that just on an absolute dollar basis, like dollar per load of sand, that gap widens. And so all that's an opportunity for us to capture price, but also share some of that saved cost with customers. And I think customers look at it that way too, and as we go in and talk to the customers, we don't expect to get all that value. We want to share it with them, and I think that's what makes the model so powerful, is we typically go in and say look -- we can provide you much better service, better on-time delivery, meet upcoming EPA and OSHA regulations, and save you money at the same time. It's a pretty compelling value proposition.
Operator
Our next question comes from the line of Kurt Hallead with RBC Capital markets.
Kurt Kevin Hallead - Co-Head of Global Energy Research and Analyst
Just wanted to follow up on your commentary on the market demand dynamics going into 2018. You talked about frac crews and sand per crew, and how you can kind of get to that calculation. That's very helpful and useful. And you guys mentioned that you guys are going to be effectively sold out of all your capacity in 2018, so would that get -- I guess that would get us to around 20 million tons of oil and gas volumes for Silica in '18 if we kind of looked at it that way? Am I thinking about that correctly?
Bryan A. Shinn - CEO, President and Director
I think that's about right.
Donald A. Merril - CFO and EVP
A: It's a (inaudible).
Kurt Kevin Hallead - Co-Head of Global Energy Research and Analyst
Okay, so that would be about 20% of the market. It looks like this year you've been running maybe order of magnitude, 13%, 14%, 15% of the market, so that's the kind of market share uptick, and is that all coming on the heels of Sandbox, do you think? Or what else could be driving that market share, other than Sandbox?
Bryan A. Shinn - CEO, President and Director
I would say right now we're at sort of that maybe 15%, 16% share, and I think your number of somewhere around 20% feels about right for 2018. I think it's a couple of things, Kurt. As I talk to customers, I consistently hear that customers like our mines, they like our footprint, they like doing business with the company. And then, when you throw Sandbox into the mix, it just makes it so easy for them to make the choice. And we're starting to offer customers a choice as well of basically all-in delivered pricing right to the wellhead. So we now provide a mine-to-wellhead solution as kind of a new offering that we've been rolling out. And, I think customers really like that, especially in a tight sand market. Imagine we come in and say, well, we're going to handle your last-mile delivery and oh by the way, we have one of the largest sand networks in the industry so you never have to worry about going to get sand, or where you're going to get your sand. And it's been fascinating to me to watch, as things have tightened up in the industry. Customers typically have to go to 6, 7, 8 different trans loads that might be sourced from maybe three or four suppliers to get enough sand to do one well, and when U.S. Silica comes in and says, we'll just do it all for you and we give you an all-in price per ton right into the blender, it looks pretty darn attractive, I think.
Kurt Kevin Hallead - Co-Head of Global Energy Research and Analyst
And then as a follow-up on Sandbox, I think in the past you guys have indicated that each Sandbox crew generates about $1 million in EBITDA on an annualized basis? Is that still the case?
Bryan A. Shinn - CEO, President and Director
Yes, so the good news is that number's going up. We've increased, in many cases, the number of boxes that we have per crew and we tend to get paid per load of sand that we deliver. And as the sand intensity per well is going up, that means more sand, more loads delivered. And so I think we'll probably now, maybe more like in the $1.2 million to $1.3 million per crew, and I think there's a chance that that continues to trend up based on what we're seeing out there.
Kurt Kevin Hallead - Co-Head of Global Energy Research and Analyst
Okay, so if you exit '18 at 100 million crews, that means over $100 million of EBITDA just from Sandbox alone? Pretty impressive. All right, and then lastly just on share repo, any general sense on the cadence of that, and do you think that $100 million is something that you'll run through throughout the course of '18 or something that extends out into '19? Any thoughts on that would be appreciated.
Bryan A. Shinn - CEO, President and Director
Sure, Kurt, and I think we'll look carefully at that and obviously it depends on a number of factors and circumstances, but we continue to believe that our equity perhaps doesn't reflect all the upside that's in the stock. And, I think we'll definitely be out there in the market purchasing shares.
Operator
Our next question comes from the line of William Thompson with Barclays.
William Seabury Thompson - Research Analyst
Brian, just as a follow-up on that last question, so you guys counted on the EBITDA per Sandbox fleet. You gave us some math around the pressure pumping crews and sand per crew. Should we think about it, the way to think about that business is if you're doing $1.2 million EBITDA per fleet and frac crews are doing 225,000 tons per crew, you're capturing about $5 of EBITDA per ton? How should we think about being able to capture some of the value proposition that Sandbox provides?
Bryan A. Shinn - CEO, President and Director
I think you're in and around that, that math, and as I said it kind of just becomes straight math at some point when you think about what's being generated there. The exciting thing for me is, it looks like we have the opportunity to continue to capture more value, particularly as we transition to some of these all-in to the wellhead models. I think the value is just going to go up, and we're really providing tremendous convenience for the customers. And so far, they're willing to pay for that.
William Seabury Thompson - Research Analyst
And in terms of the 90 million to 100 million tons of 2018 frac sand demand, that 15% to 20% year-over-year, tons per well growth, in terms of where we are today how much growth do we factor in from today's levels to maybe year-end '18? So we've seen a pretty good growth year-to-date.
Bryan A. Shinn - CEO, President and Director
In terms of sand per well, Will?
William Seabury Thompson - Research Analyst
Yes, correct. Just trying to figure out, reconcile where we are today versus that forecast in '18.
Bryan A. Shinn - CEO, President and Director
Yes, so I think it's probably -- if you look at it given all the intensity increases already, it's probably a little bit less on a year-end to year-end basis, but not much. I think you're in that kind of range. Maybe I'd use 12% to 15%, given that we've already seen some increases. But, it's -- we have a pretty good view for what's happening, given the amount of frac crews that we serve today, and that's why I just find it ironic that we've seen some reports out there that sand intensity per well is decreasing. We live this every day on the Sandbox side, and we know exactly what the intensities are, and they continue to go up pretty dramatically.
William Seabury Thompson - Research Analyst
And then since no one's asked about ISP, obviously you got it to 10% CAGR growth in terms of contribution margin. Can you talk about the moving parts to continue to drive it? Obviously you've talked about that business as a GD-plus-plus growth and you're kind of moving onto higher-value products. Maybe just a little more color there?
Bryan A. Shinn - CEO, President and Director
Sure, so we have several products in the pipeline which, some of which are going to launch I believe in 2018. We also have a couple of what I'll call sort of larger, chunkier opportunities, which are very specific growth, that I'm pretty excited about. And of course, what's not included in any of that 10% CAGR guidance is M&A obviously, and we've got several things on the board right now. We probably have a more robust pipeline in ISP than we've had in the past, and there's other things there that have $25 million, $50 million, $75 million of annualized EBITDA and then growth on top of that. So I feel like there's some real potential here to step change the ISP business, and we're going to work real hard on that in 2018.
Operator
Our next question comes from David Deckelbaum from KeyBanc Capital Markets.
David Adam Deckelbaum - Director and Equity Research Analyst
Curious what the Sandbox expansion -- one, is it fair to assume that most of the expansion's going to be in the Permian, or effectively all of it? And two, how many of your new contracts for supply are being bundled right now with Sandbox?
Bryan A. Shinn - CEO, President and Director
So I'd say over time what we're going to see is that the Sandbox distribution amongst basins essentially resembles the rig count and where the frac crews are. We're already in several basins, in fact in most basins already. So I think that will sort of normalize out over time. And sorry, what was your second question, David?
David Adam Deckelbaum - Director and Equity Research Analyst
It was just how many of the new contracts on the supply side include Sandbox agreements, or is it not included right now as a bundled offering on the long-term contracts?
Bryan A. Shinn - CEO, President and Director
So the long-term contracts typically are not bundled all-in to the wellhead pricing, although I think we've got a couple of those. So typically, what we would see, is that there's a sand contract, but then as we're discussing the sand contract we talk about last-mile delivery, and in many cases it ends up being two separate contracts. As you can imagine, customers will -- they understand the frac sand piece and what they want to buy, but Sandbox, you have to run a demo and they want to kind of see it in action. And so in many of these cases, these are new customers who have never used Sandbox before. So there's a bit of a longer cycle time, a sell cycle there. You have to convince them that it all makes sense, and things are as advertised. So we don't want to hold up the sand contracts, kind of waiting for Sandbox demos. So we tend to de-couple that in many of the cases.
David Adam Deckelbaum - Director and Equity Research Analyst
If I could just ask one more quickly, you talked about Permian supply not coming on perhaps as quickly as people think, and at the same time you announced a new mine in La Mesa over the last quarter. Can you talk about the opportunity that you see in La Mesa for the industry? Do you think this is a more limited scope in terms of leases that are available out there for sand development? Because I do think it's at least the geography that caught people off guard.
Bryan A. Shinn - CEO, President and Director
So we spend a lot of time looking for the right sites, and I believe that we have the two premier sites in the industry today. Obviously, there's always other locations out there that people are looking at, but all the ones we looked at, quite frankly, had some level of compromise. Either there was a logistics issue, or there was a water issue, or there wasn't natural gas on the site, or any one of a number of factors. So you can't say there's not other land out there because there is. But, I feel like over time what's going to happen is the best sites are going to get picked up, and then the ones that are left have some sort of defects or deficiencies. And quite honestly, it's a lot like Wisconsin, or Minnesota, when there was kind of a gold rush mentality up there. People came in, found the best sites, and got those, and then the people who came in later had to make compromises. So I feel really good about what we have. I think we've got the premier mine sites in the Permian, and I think we're going to do real well with both of them.
Operator
Our next question comes from the line of Chase Mulvehill with Wolfe Research.
Brandon Chase Mulvehill - Director & Oil Services Analyst
I guess I'm going to come back to the 2018 comment that you're effectively sold out, and so that's about 20 million tons of volumes in 2018. How much of that is actually contracted, and how much of that contracted is actually contracted at fixed price?
Bryan A. Shinn - CEO, President and Director
Historically, we've said we've wanted to be between say 50% and 75% of our oil and gas volume under contract. I would say that given the high demand that we're seeing, it is sort of the higher end and there may be a quarter or two where we actually go over the 75%, just the way the contracts stack up. And most of the pricing in these contracts is fixed. There are some contracts that adjust with recount, but I would say the majority of these are fixed-price contracts.
Brandon Chase Mulvehill - Director & Oil Services Analyst
And then, you've got some 4 million of brownfield capacity in the two Permian mines coming online. Can you talk about the timing of when you expect that capacity to come online?
Bryan A. Shinn - CEO, President and Director
So in the Permian, we've said that the Crane County site will be online by the end of this year, and so we think it's probably the last half of December. So we're not going to see much of that in 4Q, but we'll certainly see it ramp in 2018. And then La Mesa, I think we're in the sort of March-April time frame for ramp-up there. And then for the other brownfield sites, I think we will see some capacity come online in 4Q, but most of that will be wrapping up again in 2018. So I think you add it all up and there's a few tons that come online in 4Q here, but most of it really starts to ramp in 2018.
Brandon Chase Mulvehill - Director & Oil Services Analyst
Okay, and in 2018 is there any optionality for further brownfield around La Mesa or Crane County or Mississippi Sands?
Bryan A. Shinn - CEO, President and Director
There's always some tweaks you can do here and there, but I tend to look at what we're permitted for. And so the capacity we have, is capacity we have permitted right now. And so that's what I'm counting on for 2018. I'm not looking for any dramatic expansions there at this point.
Brandon Chase Mulvehill - Director & Oil Services Analyst
I'll squeeze one more in and kind of talk about the railroads. What are you seeing from a pricing standpoint, from the railroads, and what's their general view about potential risks to rail volumes?
Bryan A. Shinn - CEO, President and Director
We have really good relationships with our primary rail carriers, and I would say that the behavior we're seeing for them is relatively standard. They're giving incentives in some locations, raising prices in others. It's all sort of dependent on the ebb and flow of the materials. I would say that they recognize that there's perhaps some volume that they're going to lose, as the Permian gets some of its own capacity. But, at the end of the day, the sand volume by rail is still a relatively small part of the overall network for carriers like the UP and the BNSF. So I certainly don't see them doing anything unusual or out of character as a result of what's going on down in the Permian.
Operator
Our next question comes from the line of Ken Sill with SunTrust Robinson Humphrey.
Kenneth Irvin Sill - MD and Senior Oilfield Services Analyst
I've got a question on Sandbox. So the crews are getting bigger, the fleets are getting bigger. Is that proportional with you guys' expectations for increased EBITDA contribution, or is the capital cost going up a little bit less quickly than the EBITDA contribution?
Bryan A. Shinn - CEO, President and Director
I think what we're seeing is that the EBITDA contribution is going up fairly substantially. Certainly there's a bit more capital cost here, but it's not like we have to replicate the whole crew to get those extra tons that are coming through now. So really, all we have to do is build some more boxes, and then the chassis that carry the boxes get hooked up to the truck. So the rest of it is fairly the same. I think it's kind of a plus-1, quite honestly, and I love it when we get more boxes in a fleet. It's just more profit that comes out of that.
Kenneth Irvin Sill - MD and Senior Oilfield Services Analyst
That's a good formula. Then, on the fixed-price contracts, do you guys have escalators in there? I'm assuming at least from the paying for labor drivers, for driving the Sandbox fleets, you've got the same cost pressures everybody else does.
Bryan A. Shinn - CEO, President and Director
Yes, so on the Sandbox side we definitely have the ability to pass on -- and in all the contracts -- the ability to pass on increases in trucking costs. Obviously, I think everybody recognizes, including our customers, that those costs go up and down over time. So there's no problem getting those kinds of contracts signed.
Kenneth Irvin Sill - MD and Senior Oilfield Services Analyst
And then kind of a detail question on the contracts where you've got the deposits. As you bring those deposits into income as the volume is sold, that doesn't actually -- does that increase the margins on those contracts, or the margins are pretty much in line with everything else, you just add the deposit which offsets the purchases?
Bryan A. Shinn - CEO, President and Director
Yes, so the margin stays the same. The customer just sees a lower price on their invoice, so the margin that we book is the same as whatever the kind of "nameplate margin" is in the contract. But, since the customer has already paid for that ton, or part of that ton, they'll get a credit of X dollars per ton.
Donald A. Merril - CFO and EVP
They'll earn a certain amount of that capacity reservation fee back per ton that they buy.
Kenneth Irvin Sill - MD and Senior Oilfield Services Analyst
And I'll just squeeze one more in here. Looking forward, so the market's kind of almost myopically focused right now on the Permian, where you're letting out a -- basically, your volumes are sold, you're going to be fine. If you're looking out past 2018, oil prices are up higher, what regions do you see outside of the Permian as being the most likely to see growth? And, what is the threat of additional in-basin capacity in some of these other regions where we really haven't seen a lot of in-basin capacity added?
Bryan A. Shinn - CEO, President and Director
I think we'll see the Bakken come back. DJ Basin, I would say the Mid-Con is going pretty well. So I think there are some mines in other basins. For example, we have a mine in Oklahoma that serves the Mid-Con, and so that's where a lot of the sand that's already serving that basin comes from. So I think you'll see those, but the Permian seems like it's kind of its own thing. There's such a critical mass there of drilling and completions, that making an investment in a big mine site there makes more sense than doing that in perhaps some of the other basins. So might we see the occasional mine pop up here or there? Perhaps, but we're not expecting that to be some kind of a megatrend, if you will, that happens around the industry.
Operator
Ladies and gentlemen, that's all the time we have for questions today. I would like to turn the floor back to Bryan Shinn for closing comments.
Bryan A. Shinn - CEO, President and Director
Thank you very much. I'd like to close the call today with a few key thoughts. First, I believe that we are extremely well-positioned to capitalize on all the important market trends that we talk about today, and I really appreciate all the questions that help us clarify that a bit more. I think we'll have a strong finish to 2017 and substantial growth in 2018. Second, I want to thank our customers, especially those who have recently signed frac sand contracts with us, and we want to thank them for choosing to work with U.S. Silica and putting their trust in us. We look forward to exceeding your expectations with our best-in-class assets and team. And third, I want to thank your investors for their interest and support, and I look forward to meeting and speaking with many of you in the near future. Thanks, everyone, for dialing in, and have a great day.
Operator
Thank you. This does conclude today's teleconference. You may disconnect your lines at this time. Thank you for your participation.