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Other financial instruments (Tables)
 12 Months Ended
Dec. 31, 2024
Other Financial Instruments  
Schedule of derivative financial instruments
             
  Derivatives financial instruments   Offtake agreement measured at FVTPL   Energy forward contracts at FVTPL (i)   2024
 Current assets   5,279     -     -     5,279
 Non-current assets   3     -     -     3
 Current liabilities   (3,600)     (2,352)     (2,571)     (8,523)
 Non-current liabilities   (198)     (17,314)     (11,099)     (28,611)
  Other financial instruments, net     1,484     (19,666)     (13,670)     (31,852)

 

               
  Derivatives financial instruments   Offtake agreement measured at FVTPL   Energy forward contracts at FVTPL   2023
 Current assets   7,801     -     -     7,801
 Non-current assets   92     -     -     92
 Current liabilities   (10,343)     (2,091)     (6,643)     (19,077)
 Non-current liabilities   (150)     (17,474)     (9,421)     (27,045)
  Other financial instruments, net     (2,600)     (19,565)     (16,064)     (38,229)

(i) On December 31, 2024, due to the current scenario of high energy supply in Brazil, the Company has a projected energy surplus on forward contracts with some suppliers. Consequently, the Company recognized the fair value arising from the mark-to-market of current purchase until 2026, which resulted in an income in the amount of USD 81. This amount was accounted for as an income within “Other income and expenses, net” (Note 9) and will vary according to the market’s energy prices.
Schedule of fair value by strategy
             
        2024     2023
 Strategy Per Unit  Notional    Fair value    Notional  Fair value
 Mismatches of quotational periods              
 Zinc forward ton  232,717    1,449     209,951   (3,175)
         1,449       (3,175)
 Sales of zinc at a fixed price              
 Zinc forward ton  2,584    203     7,233   1,026
         203       1,026
 Interest rate risk              
 IPCA vs. CDI BRL 100,000   (168)     100,000   (451)
        (168)       (451)
               
          1,484       (2,600)
Schedule of changes in fair value
           
Strategy Cost of
sales		 Net
revenues		 Other income and
expenses, net – Note 9		 Net financial
results – Note 10		 Other comprehensive
income  		 Realized
(loss) gain
 Mismatches of quotational periods   (33,063)   27,514   746   -   (872)   10,299
 Sales of zinc at a fixed price   -   3,626   -   -   -   (4,449)
 Interest rate risk – IPCA vs. CDI   -   -   -   135   -   148
 Interest rate risk – EUR vs. CDI   -   -   -   1,236   -   (1,236)
 2024   (33,063)   31,140   746   1,371   (872)   4,762
 2023   14,988   (483)   (1,385)   (606)   732   13,271
Schedule of energy forward contracts
       
      Notional Notional
  2024 2023 2024 2023
 Balance at the beginning of the year (16,064)   -   -   -
 Changes in fair value   81   (15,663)   -   -
 Foreign exchanges effects   2,313   (401)   -   -
 Energy forward contracts (Megawatts)   -   - 747,498   688,877
 Balance at the end of the year   (13,670)   (16,064) 747,498   688,877
Schedule of changes in fair value offtake agreement
       
      Notional Notional
  2024 2023 2024 2023
 Balance at the beginning of the year   (19,565)   (21,833)   27,562   30,810
 Changes in fair value – note 9   (3,347)   2,268   -   -
 Deliveries of copper concentrates   -   -   (5,274)   (3,248)
 Price cap realized (i)   3,246   -   -     -  
 Balance at the end of the year   (19,666)   (19,565) 22,288   27,562

(i) During 2024, there were sales with the copper price higher than the price cap, therefore resulting in the reduction of the financial instrument liability for these sales, and the recognition of revenue at fair values.