David Strang
Analyst · Scotiabank
Thank you, Noel. Just to briefly touch on what Noel mentioned, across our operations and throughout our organization, we continue to prudently manage our business so that we are as well positioned as possible to withstand any unforeseen challenges that may arise as a result of COVID-19. Our commitment as an organization to the health and well-being of our local communities and employees remains of paramount importance to our leadership team, both in Brazil and North America.
Our Brazilian colleagues have continued to demonstrate the result to keep our operations safely running while managing and mitigating the impact of COVID-19. And the recent recognition we have been given as a company with respect to our ongoing ESG initiatives is a testament to their hard work and commitment to those principles.
In terms of production during the quarter, our results continue to reflect underlying -- solid underlying operational performance. We produced 11,178 tonnes of copper in concentrate at MCSA and 8,739 ounces of gold at NX Gold during the period.
Focusing first on our MCSA operations in the Curaçá Valley, we mailed 627,071 tonnes of ore, grading 1.98% copper and achieved average metallurgical recoveries of 90% during the quarter. Across the board, improvements were driven in large part by contributions from the Vermelhos Mine where 253,349 tonnes, grading 3.26% copper were mined during the period. A significant 56% increase in contained copper coming from Vermelhos when compared to the first quarter.
At the Pilar Mine, 371,794 tonnes, grading 1.4% copper were mined during the period, essentially in line with the first quarter, albeit with a modest increase in tonnes mined. As Noel mentioned, we achieved a new quarterly record with respect to C1 cash costs of $0.65 per pound of copper produced, reflecting the strong operational performance, continued currency tailwinds and improved byproduct gold and silver prices during the second quarter.
During the first half of 2020, C1 cash costs averaged $0.68 per pound of copper produced. We are maintaining our 2020 production guidance for our Curaçá Valley operations and previously revised C1 cash costs guidance of $0.70 to $0.85 per pound of copper produced. Similarly, we are maintaining our previously revised capital expenditure guidance range of $56 million to $68 million and $20 million to $25 million in exploration expenditures through September of this year.
As in prior years, we will aim to update our full year exploration spend guidance to include planned drilling during the fourth quarter when we release our third quarter results. Although all of our capital programs have and continue to run normally through the first half of the year, our full year -- excuse me, our full year guidance is subject to an elevated degree of uncertainty as a result of the COVID pandemic.
We continue to execute on and advance several key growth projects. Despite significant challenges associated with COVID 19, our project team was able to deliver and fully install our new high-intensity grinding mill in early July, only a week or 2 behind schedule.
Instrumentation and control system integration are on track for completion this week and commissioning is underway through a creative effort that involves both on-site teams who underwent strict quarantine measures working alongside a virtual multinational commissioning support team. We expect full commissioning and handover to operations by the end of August. This is an incredible accomplishment with significant contributions from our entire project team globally. And I would like certainly -- I would like to congratulate them all on this call.
Looking into the second half of the year on the back of commissioning, we expect to see a significant improvement in overall stabilization of metallurgical recoveries in the mill. Our ore sorting testing campaign, which has been running at a commercial scale since January, is substantively complete, and we have now tested 8 different discrete ore bodies throughout the Curaçá Valley out of our variety of grades. The results are highly encouraging.
We will continue to operate the test program through the third quarter on the last planned orebody, while data analysis, process integration and operational optimization work continues to fully quantify the benefits of preconcentration. Based on work to date, we believe that ore sorting will be an integral component to further optimization -- to further optimize the production portfolio for the various operations of the Curaçá Valley as well as new discoveries in the future. Additional detail on the work performed and the results of the test campaign are expected during the third quarter.
In addition to ore sorting, I am very excited about the completion of a laboratory upgrade project that will allow us to do multielement analysis in-house, specifically platinum group metals. This project was completed at the end of the quarter, and we are ramping up daily sample volumes over the next several weeks as scheduled.
Once fully integrated, we expect this addition to other borrowers to significantly reduce costs but more importantly, turnaround time for platinum group metal assay results, which will be a welcome addition to the ongoing work of our exploration department.
On exploration in the Curaçá Valley, we currently have 28 drill rigs operating. Our in and near-mine exploration programs remain focused on the deepening extension of the Pilar Mine where we have continued to intercept very high-grade Superpod mineralization at depth, including the recently announced intercept of 96.4 meters, grading approximately 3.97% copper, the best hole we have ever drilled in the Curaçá Valley. Additionally, at Vermelhos, we are advancing drilling and borehole EM work, looking for down-plunge expansions of the Siriema massive sulfide conduit and continue to execute the fan drill program designed to test for continuity of mineralization beneath the mainVermelhos ore bodies.
With a substantive portion of our in and near-mine programs completed, we have been aggressively advancing our regional exploration efforts on 4 recently interpreted mineral systems. While preliminary results from these systems continue to be encouraging, additional detail on these ongoing exploration programs remain planned for the second half of the year. Consistent with our scheduled quarterly updates, results from our ongoing exploration programs will be further detailed in the upcoming exploration update, which we typically release 4 to 6 weeks following our financial results.
At the NX Gold Mine, production during the quarter totaled 8,739 ounces of gold and 5,327 ounces of silver from total mill feed of 39,108 tonnes, grading 7.75 grams per tonne gold, of the metallurgical -- average metallurgical recoveries of 89.6%. Gold production, mill throughput and recoveries improved quarter-on-quarter, reflecting the anticipated ramp-up of mining at the Santo Antonio Vein. Operational performances remains -- gains contributed to record C1 cash costs of $437 per ounce of gold produced during the second quarter, an improvement of $157 per ounce as compared to the first quarter.
During the first half of 2020, C1 cash costs averaged $511 per ounce of gold produced. As previously noted, we continue to expect full year production to be weighted towards the second half of the year. Our annual production guidance for the NX Gold Mine remains at 38,000 to 40,000 ounces of gold and previously revised C1 cash costs of $425 to $525 per ounce of gold produced. Annual capital expenditure guidance for the NX Gold Mine remains unchanged from previously revised guidance of $7 million to $9 million with an additional $2 million to $3 million to fund its ongoing exploration programs.
While not part of our current operating portfolio, an initial review of our buyer team to evaluate the Boa Esperanca copper project has resulted in some fairly compelling opportunities, recall that we effectively inherited the existing design of the project following our acquisition of MCSA. And for the first time, I've taken a very hard and close look at the project with the engineering group. While we had initially planned fairly routine desktop update, several aspects are pointing us to a rework of the entirety of the project from the ground up, and we continue to make progress on that front.
With that, I will now pass it over to Wayne, who will provide an overview of our financial performance.