Mario Antonio Bertoncini
Analyst · Scotiabank
Thank you, Tito. Moving onto Page 7, we present our mining performance in the first quarter. Let me remind you that we convert our production by metal to a zinc equivalent basis using full-year 2017 LME prices in order to present comparable figures. The zinc equivalent production in Nexa's mining operations totaled 134,000 tons in the first quarter of '18, in line with the same period of the previous year. The volume of treated ore increased by 4% in this quarter, this last quarter, and also benefited from an increase in copper and silver grades. On the other hand, grades in Cerro Lindo were lower, as Tito mentioned before. This production level represents 101% of the volume planned for the quarter, and it was considered in our annual guidance. At the bottom right part of the page, we have our mining cash cost after by-product credits, which were [ 4% ] lower in the quarter, benefiting from higher by-product prices and lower treatment charges, TC.
Please, let's move onto Slide 8, where we discuss our smelting performance. Sales of metallic zinc in the first quarter of this year were 5% higher compared to the first quarter of '17, totaling 137,000 tons, supported by higher production once our smelters operated at full capacity; and as discussed in the previous quarters, fully recovered from the impact of rains and floods in Peru at the beginning of last year. The Brazilian metal sales were in line with the previous year. The smelting costs were positively affected by the higher LME prices and lower TCs.
Moving onto Page 9, our revenues went up 23% to $676 million in the first quarter of this year, primarily due to higher metals volumes and base metals prices in the global market. The higher revenues allowed us to reach an adjusted EBITDA of $191 million in the quarter, resulting on a sound margin of 28%, and an increase of 33% when compared to the same period of last year. On the upper right part of this slide, we present our CapEx breakdown for the period, reinsuring our focus on the mining investments, which accounted for 61% of the $33 million disbursed into March. This is 6% higher than the CapEx for the first quarter of '17. On the bottom part of the page is our free cash flow before investments, debt, principal and dividends, which shows a higher investment in working capital, mainly due to higher LME prices and some inventory increases when comparing to the same period of last year.
Let's move on to the next slide, please. Regarding our operational segments, the EBITDA in mining increased 59% compared to the first quarter of '17, as a result of the higher LME prices already said and also due to lower treatment charges. The EBITDA margin grew from 39% to 49% in mining. For the metals division, we had a decrease in the EBITDA despite the growth in volumes. The pressure down on treatment charges is caused by the imbalance between market supply and demand for zinc. We also had a $4 million nonrecurring provision regarding a dispute on electric energy supply in Peru.
Let's move on to Page 11, where we talk about our guidance for 2018. We are reiterating our guidance for 2018 that we released in last February. We have increased, so far, the total treated ore by more than 4% in our mines, and there was a trade-off between increased copper and silver production, offsetting some decline in zinc when we compare the first quarter of this year with the same quarter of last year. Lower grades, especially in Cerro Lindo mine, were expected at the beginning of this year, as we get prepared to access higher grade areas throughout the year.
Let's move on to the next slide to discuss our guidance on CapEx and project related expenses. We also reiterate our guidance for CapEx and project related expenses for this year. We will discuss the main projects in more detail further on. And regarding the main milestones for the year, in terms of expenditures, I would like to highlight: First, in Vazante, where we placed orders for the long lead time items for the dry stacking project, and the life of the mine extension is only scheduled. On the other front, we expect to submit the Aripuanã project for approval during the second half of this year. Another front is in Cerro Lindo. In Cerro Lindo, the new waste disposal area and seawater pipeline replacement projects are also advancing. And finally, a last topic here, we already had appointed the engineering contractors for the development of FEL2 of Magistral and Pukaqaqa project. The expenses on mineral exploration and project development advance and will be intensified in fact on the next quarters.
Let's move on to Slide 13, where we present liquidity and indebtedness. Following our financial discipline and cash and leverage targets, we continue to analyze opportunities to keep reducing debt cost and extend the average maturity of our debt to be implemented on the following months, as we expect. As of March, the end of March of this year, the average maturity of the total debt was 6.6 years at an average cost for this debt of 5% per annum. During the first quarter of this year, we amortized $60 million in Export Credit Notes in order to reduce our interest costs. In terms of currency, 91% of the total debt is denominated in U.S. dollars and the bonds accounts for 76% of this total debt. By the end of the first quarter, Nexa reported a cash balance of $1.1 billion and a net debt of $260 million, resulting in 0.37x or 0.4x net debt to adjusted EBITDA ratio, when considering the last 12 months' adjusted EBITDA.
Now, I will pass back to Tito so we can talk about our projects and priorities for the year. Thank you.