Thank you, Tito. Good morning, everyone. Please, let's move to Slide 8. Beginning with the chart on your upper left, consolidated net revenue in first quarter of 2021 was $603 million, up 36% compared to the same period a year ago, mainly driven by higher metal prices.
Adjusted EBITDA stood at $180 million, strongly recovering from the $44 million in first quarter 2020. As Tito mentioned, this is the third highest figure in our trajectory, a milestone for us. This performance reflects not only the increase in metal prices, but also our cost reduction initiatives and improved the operational performance from Nexa Way program.
It's were mentioned that this number was affected by the impact of approximately $6 million related to the update of the environmental provision for the Três Marias smelter.
On the next slide, we will discuss in further details our segment's performance. On Slides 9 and 10, we will discuss our mining segment operational results. Zinc equivalent production reached 130,000 tonnes, up 7% year-over-year, mainly driven by Cerro Lindo and El Porvenir mines.
Note that mining production in Peru was temporarily suspended by mid-March 2020 due to the mandatory measures announced by the Peruvian government to control COVID-19 spread. In first quarter 2021, zinc production was slightly higher compared to the same quarter a year ago, while copper production increased by almost 13%.
As previously disclosed, Atacocha production was temporarily suspended due to community blockades. Going forward, we expect a decrease in zinc production in Vazante as Extremo Norte mine is expected to remain suspended until the end of the second quarter.
Consequently, we decreased our annual zinc production guidance by 10,000 tonnes. Production guidance for copper, lead and silver are maintained.
In terms of net revenue, we've reached $255 million in the first quarter of 2021, up 57% year-over-year, explained by higher average LME prices and the increase in sales volume. Adjusted EBITDA for the mining segment stood at $97 million, significantly recovering from the negative $70 million in first quarter 2020.
As you can see on Slide 10, this performance was mainly explained by the increase in volume with a positive variation effect of $12 million followed by market-related factors such as higher prices and lower TCs, with an impact of approximately $80 million and higher byproduct credits.
In terms of cash costs, as you can see on the bottom right, consolidated mining cash costs in first quarter 2021, compared to the same quarter a year ago decreased by 54% to $0.24 per pound. Positively driven by higher byproduct prices and lower operating costs.
Now let's turn to the smelting segment results. On Slides 11 and 12, we will discuss our smelting segment operational results. Net of sales amount to 148,000 tonnes, up 2% year-over-year and down 80% from fourth quarter 2020 due to lower seasonal demand.
Demand remains robust and we expect the smelter sales to improve in next quarters following typical seasonality. This, our annual sales guidance is maintained. Net revenue in the quarter was $467 million, partly driven by higher prices and volumes. Adjusted EBITDA for the smelting segment stood at $84 million, up 36% from first quarter 2020.
As you can see on Slide 12, this increase in EBITDA was mainly explained by higher prices, higher TCs and the Brazilian real devaluation against the U.S. dollar, all of which had a positive $25 million impact on EBITDA and the increase in byproducts and the decrease in costs also contributed with an additional $7 million.
In terms of cash costs, consolidated smelting cash costs increased to $1 per pound in first quarter 2021, mainly driven by market-related factors such as higher zinc prices impacting the concentrate purchase price.
Third-party services also had a negative impact in the quarter. I will now turn over the call to Rodrigo Menck, our CFO, who will provide more detailed information about our balance sheet. Menck, please?