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Operator
Thank you for standing by. This is the conference operator. Welcome to the Ero Copper Second Quarter 2023 Financial and Operating Results Conference Call. (Operator Instructions) And the conference is being recorded. (Operator Instructions)
I would now like to turn the conference over to Courtney Lynn, Vice President, Corporate Development and Investor Relations, for opening remarks. Please go ahead.
Courtney R. B. Lynn - SVP of Corporate Development, IR & Sustainability
Thank you, operator. Good morning and welcome to Ero Copper's Second Quarter 2023 Earnings Call. Our operating and financial results were released yesterday afternoon and are available on our website as are our financial statements and MD&A for the 3 and 6 months ended June 30, 2023. On the call with me today are David Strang, Ero's Co-founder and Chief Executive Officer; Makko DeFilippo, President and Chief Operating Officer; and Wayne Drier, Chief Financial Officer.
We will be making forward-looking statements that involve risks and uncertainties from which actual results may differ materially. We would refer you to our most recent annual information form available on our website, SEDAR and EDGAR, for a discussion of the risk factors of our business and their potential impact on future performance. As a reminder and unless otherwise noted, all amounts are in U.S. dollars.
I will now pass the call over to David Strang.
David Maxwell Strang - CEO & Director
Thank you, Courtney, and thank you, everybody, for joining us today. During the second quarter, we continued to navigate a dynamic macroeconomic environment as we observed strengthening fundamentals in global copper demand, while at the same time experiencing softer copper prices driven by global economic concerns.
The transition to clean energy has intensified the need by governments and downstream industries to secure critical minerals supply as evidenced by impressive investments from nontraditional investors across the copper sector. Despite this positive backdrop, we saw lower copper prices during the period as well as a stronger Brazilian real. However, we're able to offset the impact of these changes in the copper price and exchange rate through the strong execution of our full year operating plan. This resulted in a noteworthy increase in copper production of nearly 30% compared to the first quarter.
Additionally, our Xavantina operations performed well, contributing to adjusted EBITDA of $49.1 million and adjusted net income attributable to the owners of the company of $22.3 million or $0.24 per share on a fully diluted basis.
We also made meaningful progress on our key growth initiatives, including the Tucumã project and the CaraÃba operations' new external shaft. I am pleased to report that we are approaching 50% physical completion at Tucumã project. Similarly, the pre-sink phase of development for the CaraÃba operations new external shaft was successfully completed, and we are gearing up for the main shaft sinking later this year.
Importantly, we have achieved over 95% visibility on planned capital expenditures at Tucumã and approximately 80% visibility on shaft capital, with total forecasted capital for both projects remaining within 5% of the original estimates.
Before I hand over the call to Makko to provide more detail on the progress around our key growth projects, let me give you an overview of our second quarter operating performance and the expected cadence of production during the second half of the year.
At our CaraÃba operations, we produced 12,004 tonnes of copper in concentrate at C1 cash costs of $1.52 per pound of copper produced. The higher mine tonnage and copper grades at all 3 of our mines were driven by planned stope sequencing, resulting in increased production and lower unit costs compared to the first quarter. While we continued to sell copper concentrate to our domestic smelter during the quarter on a limited and prepaid basis, the associated reduction in concentrate sales costs was offset by continued strengthening of the BRL.
As for the cadence of production in the second half of the year, we expect copper production to be slightly lower in the third quarter compared to the second quarter due to slightly lower planned mill throughput volumes and copper grades resulting from stope sequencing. However, we expect mill throughput volumes to increase in the fourth quarter with the anticipated commissioning of the new ball mill and drive quarterly production to its highest level of the year.
Putting aside any fluctuations in the BRL exchange rate, we expect these variations in production to be reflected in CaraÃba's C1 costs, with slightly higher C1 cash costs expected in the third quarter and lower C1 cash costs expected in the fourth quarter. As a result, we are reaffirming our full year copper production guidance of 44,000 to 47,000 tonnes of copper produced at C1 cash costs of between $1.40 to $1.60 per pound of copper produced.
Turning to our Xavantina operations. We continue to benefit from strong mine and processed gold grades of over 13 grams per tonne during the quarter. This represents an increase in grade of over 11% quarter-on-quarter and 100% year-on-year, effectively offsetting lower metallurgical recoveries that were impacted by elevated mill inventory at quarter end as well as elevated carbon content in several high-grade stopes mined and processed during the period. Consequently, we produced 12,333 ounces of gold and C1 cash costs of $492 per ounce of gold produced.
We are reaffirming Xavantina's 2023 gold production guidance of 50,000 to 53,000 tonnes -- sorry, ounces, I wish it was tonnes, of gold at C1 cash costs of $475 to $575 per ounce of gold produced. With the completion of development to the Matinha vein during the second quarter, we expect higher gold production in the second half of the year as we commence production from this second ore source.
Regarding our 2023 capital expenditure guidance, we have increased our range by $15 million to $20 million to reflect proactive investments following a detailed review of major projects and support infrastructure at the CaraÃba operations during the second quarter. While the shaft project remains within 5% of budget, we have elected to invest in various upgrades in the second half of the year, which Makko will discuss more, to support our expanded life-of-mine operating plans.
It is worth noting that the non-CaraÃba components of our capital expenditure guidance as well as our C1 cash cost guidance remain unchanged. Nevertheless, we are closely monitoring the BRL to U.S. dollar exchange rate, which averaged approximately BRL 4.8 in July. The BRL has since weakened following a higher-than-expected 50 basis point rate cut by Brazilian Central Bank and -- sorry, Central Bank rate, combined with a more dovish tone expressed by the country's policymakers. If the BRL remains at current levels or strengthens again, we may consider adjusting the BRL 5.30 exchange rate assumed in calculating our full year operating cost and capital expenditure guidance ranges.
I will now pass the call to Makko to discuss the highlights around our year-to-date project execution, after which, Wayne will discuss our financial results for the quarter.
Makko DeFilippo - President & COO
Thank you, David, and good morning, everyone. During the second quarter, we continued to make excellent progress across our portfolio of growth projects. Advancement of critical path work streams at both Tucumã and our shaft project at CaraÃba is evident in the updated project photos we have included in our second quarter news release.
At Tucumã, as David mentioned, we are approaching 50% physical completion and are on track to achieve first production during the second half of next year. Contractor mobilization, hiring of key operational positions and the continuation of our training programs, which are focused on hiring locally, all progressed significantly during the period. And we now have a workforce of over 1,100 people on site.
Notable achievements this quarter include the completion of all critical path earthwork activities and completion of all large volume civil work. In addition, we commenced assembly and erection of structural steel for the primary crusher, the ball mill and flotation areas as planned.
During the third quarter, we expect to complete the construction of our water reservoir; continue to advance steel and electromechanical assembly throughout the process area; install our primary crusher and ball mill, which are both on-site; and install our main substation, which is completing final testing and should arrive on site in the coming weeks.
In summary, physical progress and procurement at Tucumã remains on track. And with over 95% visibility on planned capital expenditures for project completion, we are reaffirming our $305 million capital cost estimate. We expect capital spend at Tucumã to be second half weighted this year due to ramp-up on steelworks, electromechanical assembly and piping as well as a number of final equipment deliveries expected during the second half of the year.
At our CaraÃba operations, we are focused on executing our operational plans and advancing our Pilar 3.0 initiative, which includes the construction of a new external shaft for the Pilar Mine and an expansion of our mill capacity. The new external shaft project for the Pilar Mine is progressing according to schedule and was approximately 25% complete as at quarter end.
As David mentioned, we completed the pre-sink phase of the shaft during the period. Subsequent to quarter end, we successfully lowered the sinking stage into the shaft collar and commenced hoisting of the preassembled head frame into its permanent configuration. Our mill expansion project, which includes installation of a third ball mill and a new flotation upgrade, is on track to start commissioning and ramp up during the fourth quarter.
Looking ahead at CaraÃba. We remain fully on track to complete our mill expansion project and initiate the main sink on the new shaft by year-end. Underground at Pilar, we remain on schedule with development and permanent underground infrastructure installations for shaft handover to operations by the end of 2026.
It is worth noting that during the quarter, we completed a detailed assessment of support infrastructure at our CaraÃba operations. This thorough review identified new capital investments and upgrades totaling approximately $15 million to $20 million. These investments are specifically focused on bolstering the support infrastructure for the deepening project of the Pilar Mine, our underground paste-fill distribution system and overall tailings capacity. The primary objective behind these strategic investments is to enhance operating resiliency of the CaraÃba operations and support its extended mine life.
In the months and years ahead, we will continue to look at staged strategic investments in infrastructure and new technologies to improve operational performance, ensure operating resiliency and protect our frontline workforce.
I will now turn the call to Wayne to discuss our financial results.
Wayne Drier - CFO
Thank you, Makko. As David mentioned earlier, our second quarter financial performance reflected a notable increase in copper production mixed with lower copper prices and a stronger Brazilian real compared to the first quarter. This drove operating cash flows of $55.5 million that helped to fund capital expenditures of $126.9 million, which were primarily directed towards the ongoing execution of our organic growth initiatives.
We ended the quarter with a robust liquidity position of approximately $330 million. This included cash and cash equivalents of $124 million, short-term investments of $56 million and $150 million of undrawn availability under our senior secured revolving credit facility.
Regarding our Brazilian real to U.S. dollar exchange rate hedges, we reported realized gains of $2.8 million and unrealized gains of $2.1 million. Looking ahead to the second half of the year, we are hedged on approximately $15 million per month at an average floor rate of BRL 5.3 and an average cap rate of approximately BRL 6.3 to U.S. dollar.
We also remain hedged on approximately 75% of our copper production for the remainder of the year through a 0 cost collar hedge program initiated in January. Hedge contracts provide a full price of $3.50 per pound on 3,000 tonnes of copper per month through December 2023. It's worth noting that our realized metal prices for each quarter reflect settlement adjustments and other miscellaneous items not captured in C1 cash costs. Furthermore, average realized prices are influenced by the timing of the metal sales, which do fluctuate within a given quarter.
With that, I'll now hand the call back to David to share some final remarks.
David Maxwell Strang - CEO & Director
Thank you, Wayne, and everyone who joined the call today. Before we proceed to the Q&A session, I want to take a moment to express my sincere appreciation to our dedicated colleagues in Canada and Brazil. The commitment and hard work have been instrumental in not only executing our operating plans but also driving progress on our organic growth projects.
Additionally, I am pleased to announce the publication of our 2022 Sustainability Report earlier this week. This report outlines our strategy and performance across key environmental, social and governance topics. As the global decarbonization movement gains momentum and stakeholder interests converge, we are proud of our strong ESG profile, which we firmly believe will translate into positive financial outcomes, and we are excited about the opportunities to expand our contributions to the green economy as we execute on our growth strategy.
On a personal note, a lot of you know Courtney very well. I'd like to also extend our congratulations to Courtney, who was promoted to Senior Vice President of the corporation for Corporate Development, Investor Relations and Sustainability. And this is a true testament to her strength and what she adds to our team that we were pleased to be able to provide her with this promotion. So congratulations, Courtney, from us and the rest of the team.
And with that, operator, we'll now open the lines for questions.
Operator
(Operator Instructions) The first question comes from Dalton Baretto with Canaccord Genuity.
Dalton Baretto - Analyst
Congrats, Courtney. I wanted to start by asking about the realized price, and I understand Wayne just touched on it, but maybe just a little bit more context. Over the last few quarters, I mean, you've been realizing somewhere between a 10% and 15% discount to the LME. I'm just trying to understand really what's in there and whether that's kind of a go-forward assumption to make.
Wayne Drier - CFO
Yes, Dalton, I think we obviously have a number of adjustments that flow through that. And obviously, there are settlement adjustments as well, as I mentioned. So when you think about the final deliveries, there are weight adjustments and assay adjustments. And so I think when we -- when you look at what we realized versus the headline price, I think that's a fair assumption to make going forward.
Dalton Baretto - Analyst
Okay. Great. And then maybe I can just ask you another one. On the BRL implications, if the BRL does stay around BRL 4.8, BRL 4.9, and I understand the floor on some of your hedges is around BRL 5.3. If the BRL does stay around BRL 4.9, what are the implications on your C1 costs as well as on your CapEx estimates for the 2 projects?
Makko DeFilippo - President & COO
Yes. Dalton, this is Makko. I'll pick that one up. When you look at our business, and I think we've talked about this in the past, particularly in the operating cost level, our operating costs are about 95% denominated in Brazilian reais. That excludes things like diesel, which do have a dollar link component. So that's a 9.5:1 ratio on the BRL and -- 0.95:1 ratio on the BRL.
On our capital projects, it depends on which one you're talking about. The Tucumã, when you look at the remaining spend, is about 90% to 95% BRL. When you're looking at the shaft project, it's less. It's probably about 60% BRL. And on the mill expansion, it would be the same, 95%. It's predominantly labor at this stage.
Operator
The next question comes from Orest Wowkodaw with Scotiabank.
Orest Wowkodaw - MD & Senior Equity Research Analyst of Base Metals
David, can you please give us an update on the nickel exploration? And I'm still -- and I'm curious whether we should still be anticipating. I think you previously mentioned October as a target for more of a fulsome nickel update. Is that still the case?
David Maxwell Strang - CEO & Director
Thanks, Orest. I'm surprised Dalton didn't beat you to the punch on that one. With regards to nickel, we continue to advance the projects and moving them forward. I think where we are standing right now is we're hopeful to be able to have a more fulsome conversation with the market, probably more likely in November. But I don't want to get too into the weeds with regards to everything that's going on in and around the projects as we're working on them. But we want to be able to give the most comprehensive update we can with regards to how that's all coming together. And it looks like the best guidance I can give you right now is possibly November with regards to doing that.
There's a couple of items that we're working through with regards to land packages. And as they come to fruition, and we're hopeful they still come to fruition in the near term, so we'll be able to have a more fulsome discussion. So I think right now, the best indicators I can give you is sometime in November is likely when we would like to be able to have a more fulsome discussion with the marketplace about it.
Orest Wowkodaw - MD & Senior Equity Research Analyst of Base Metals
Okay. And just as a follow-up to that, should we be anticipating a potential maiden resource on the nickel? Or is that way too premature?
David Maxwell Strang - CEO & Director
I think it's a little premature that -- Orest. I mean what we're trying to understand with regards to the various areas that we have is what is the quantum of opportunity we have with regards to various nickel targets that we're dealing with. I think resources right now, I think, is premature. I think what we're trying to understand is what is the quantum of the opportunity throughout the Curaçá Valley in terms of the number of these that we can look at and we can start working on in a comprehensive fashion over the course of the next few years.
Orest Wowkodaw - MD & Senior Equity Research Analyst of Base Metals
Okay. Perfect. And just one follow-up to Dalton's question for Wayne about the realized nickel price -- or sorry, copper price. I realized this quarter was pretty volatile with respect to copper price. In a -- I mean going forward, in a flat copper price environment, which then eliminates the provisional pricing impact, what kind of run rate discount should we be anticipating to LME in that kind of environment? Because I feel like the discount this quarter was exaggerated to the downside.
Wayne Drier - CFO
Yes, Orest, I think this quarter, we did have one shipment, which was we had an anomalous settlement on assay. And so we decided to -- it's still out for umpire, but we decided to book that through. So that had an oversized impact on this number. I think going forward, it will be much more in line with what you've seen in the past, which is sort of 5% to 10%.
Orest Wowkodaw - MD & Senior Equity Research Analyst of Base Metals
And that 5%n to...
Wayne Drier - CFO
And that reflects -- just to add there, that reflects a lot of -- there are a lot of adjustments that come through that are really specific to the different contracts we signed with the various off-takers. As you know, we're not under long-term contracts. We do short-term contracts, and every short-term contract has different nuances as to the adjustments and sort of terms and conditions outside of treatment and refining charges.
Orest Wowkodaw - MD & Senior Equity Research Analyst of Base Metals
Okay. Because this is -- I'd say this is an unusual -- to see it this way in terms of it being reported. I mean, potentially, could -- are these not -- should not these be reflected in costs, in C1 costs, rather than a discounted LME price?
Wayne Drier - CFO
Look, we have a certain approach that we take. And the -- we're comfortable that these reflect discounts to the metal price. And we've been very consistent with this approach over the last few years. So we haven't changed our approach to that. And I think that's reflected in -- if you look back in our -- in prior reporting.
Operator
And the next question comes from Gordon Lawson with Paradigm Capital.
Gordon Lawson - Analyst
Can you please provide a little more color on the 45% completion at Tucumã in terms of the status of delivery of long lead items?
Makko DeFilippo - President & COO
Yes. Gordon, this is Makko. So when you look at our long lead items, effectively, all the purchases have been placed. As I said, the longest lead items, which we've been on ball mill and primary crusher, those have arrived on site. When I go through the manufacturing punch list across the remaining long lead items, those are in near completion stage at most of our providers for those pieces of equipment. And we expect deliveries to occur throughout the balance of the year on all long lead items that we purchased or put deposits on in the last 12 to 14 months.
Gordon Lawson - Analyst
Okay. Great. And looking at the pre-stripping, seeing how far it's ahead of schedule, are there any plans to mine and stockpile the sulfide ore prior to the mill completion?
Makko DeFilippo - President & COO
Yes. If you look at the schedule, Gordon, it's a great question, we're about 2.7 million cubic meters advanced or approximately 5 million tonnes on the pre-strip. We anticipate reaching first sulfide ore in November of this year, so sometime during Q4. And we will accumulate a stockpile of ore in advance of commissioning, which we anticipate occurring in 2024, as you know.
David Maxwell Strang - CEO & Director
I'll even add on to that, Gordon. What I'm pretty impressed with the group is the detail they've gone into even with the stockpile. We -- obviously, everybody knows that we're going to be mining very, very high grades in the early part of the mine's life.
And the team has actually put together a plan, whereby we're going to have both a high-grade and a lower-grade stockpile. So that as we go through recommissioning and we are starting to work and make sure everything works, that we're not wasting high-grade material, running it through as we're testing, but rather using lower-grade material for that test work. And I've got to commend Makko and the team with regards to -- the thinking with regards to doing that and the granularity that the team is working towards even with regards to that nuance.
Operator
(Operator Instructions) The next question comes from Stefan Ioannou with Cormark Securities.
Stefan Ioannou - Analyst of Institutional Equity Research
Congratulations, Courtney. Just curious, in past calls, you sort of -- you mentioned seeing potential -- district potential beyond Tucumã. I know it's always hard to comment on these things, but is there anything where you can update us on that front in terms of what you're seeing in that area maybe next?
David Maxwell Strang - CEO & Director
Nothing right now with regards to that, Stefan. We are working -- we've mentioned that we're working on a project with Soma. I think it's a little early to get into too much detail with regards to what we're seeing there. The team is also widening its viewpoints with regards to a more regional review in terms of the general area around the Tucumã project. So nothing new to report there with regards to that.
Operator
The next question comes from Jackie Przybylowski with BMO Capital Markets.
Jackie Przybylowski - MD & Metals and Mining Analyst
I'll add my congratulations to Courtney as well. Well deserved. I was wondering on the changes to your CapEx guidance that you've given for 2023, can you talk a little bit about which projects you've brought forward or added to the list for this year, for the second half?
Makko DeFilippo - President & COO
Yes. For sure, Jackie, this is Makko. So when you go through -- I think it's important to note that it's a various number of line items. No single line item is above $2.5 million. These are a series of small investments, operational improvements in the areas related to some of the permanent infrastructure for the Deepening project, which frankly, we won't have the opportunity to go back into once the shaft is in operation.
And we're advancing some of the installation on our permanent infrastructure, as well as in tailings and the underground distribution system for the paste-fill line. Those are the main buckets. And as I said, it's a series of investments and line items that cumulatively add up to about $15 million to $20 million.
Jackie Przybylowski - MD & Metals and Mining Analyst
Can I ask -- just as a follow-up, sorry. What prompted those projects to be brought forward? I know you mentioned coordinating with the shaft. But is this related to the fact that your balance sheet is in better shape than you had anticipated? Or just the shaft is moving forward more quickly than you had expected?
David Maxwell Strang - CEO & Director
I'm going to take this one. In terms of Makko taking over the role as COO, he decided to do a comprehensive review. And he felt that certain projects needed to be moved up in terms of the overall profile of some of the items with regards to efficiencies in the business, along with some projects that he felt needed to be spent sooner rather than later.
Operator
This concludes the question-and-answer session. I would like to turn the conference back over to David Strang for any closing remarks.
David Maxwell Strang - CEO & Director
I'd just like to thank everybody again for coming on the call. I hope everybody is having a great summer. And as always, we are available for questions. And please feel free to reach out to Courtney, myself, Makko and Wayne, if you have anything further you'd like to get a clarity on.
Thanks again, operator, and thanks to everybody. Bye-bye.
Operator
This concludes today's conference call. You may disconnect your lines. Thank you for participating, and have a pleasant day.