About Us Reserves and Resources

In 2017, we designed a detailed process for the preparation of technical reports required for the declaration of our mineral resources and mineral reserves in all of our mines and greenfield projects, which are in accordance with the standards set forth in Canada’s National Instrument (NI) 43-101 - Standards of Disclosure and the U.S. Securities and Exchange Commission (SEC) Industrial Guide (IG) 07. We are always working on the updated of our mineral reserves and mineral resources, as presented below. The technical reports, mining reports and press releases related to mineral reserves and mineral resources are available on www.sedar.com and www.sec.gov.

Mineral Reserves and Mineral Resources update 

Nexa Resources announced in March 2019 the publication of updated information relating to mineral reserves and resources as of December 31, 2018. Such press release discloses estimated contained metal in the Proven and Probable Mineral Reserve categories in which the calculation was in accordance with the 2014 CIM (Canadian Institute of Mining. Metallurgy and Petroleum) Definition Standards, whose definitions are incorporated by reference in National Instrument 43-101 - Standards of Disclosure for Mineral Projects (“NI 43-101”). Such press release will be followed by the filing of a complete mining report in conjunction with the filing of its 2018 Form 20-F.

Mineral Reserves - NI 43-101
  Grade Contained Metal Content
Asset Ownership (%) Class Tonnage Zinc Copper Silver Lead Gold Zinc Copper Silver Lead Gold
(Mt) (%) (%) (g/t) (%) (g/t) (kt) (kt) (koz) (kt) (koz)

Cerro Lindo Mine

80.16%

Proven 34.48 1.85 0.65 21.2 0.21   637.9 224.1 23,446 72.4 0
Probable 14.61 1.53 0.71 20.8 0.17   223.5 103.7 9,789 24.8 0
Subtotal 49.09 1.75 0.67 21.1 0.20   861.4 327.9 33,235 97.2 0

El Porvenir Mine

80.16%

Proven 9.28 3.54 0.20 58.6 0.97   329.1 18.5 17,498 90.4 0
Probable 8.20 3.92 0.21 49.9 0.89   321.2 18.2 13,154 72,6 0
Subtotal 17.49 3.72 0.21 54.5 0.93   650.3 36.7 30,652 163.0 0

Atacocha Mine (Underground)

72.94%

Proven 1.63 3.49 0.20 94.8 2.14   57.0 3.3 4,980 35.0 0
Probable 2.16 4.52 0.30 69.4 1.38   97.6 6.5 4,981 29.9 0
Subtotal 3.79 4.08 0.26 80.3 1.71   154.6 9.7 9,801 64.9 0

Atacocha Mine (Open Pit)

72.94%

Proven 3.10 0.96 0.03 33.0 0.99 0.22 29.7 0.9 3,288 30.8 22.2
Probable 2.93 0.92 0.03 32.7 1.06 0.21 27.0 0.8 3,080 31.0 19.9
Subtotal 6.03 0.94 0.03 32.8 1.02 0.22 56.7 1.7 6,368 61.7 42.1

Vazante Mine

100%

Proven 10.11 10.09   16.4 0.3   1,020.1 0.0 5,337 30.3  
Probable 7.75 9.36   11.2 0.25   725.4 0.0 2,778 19.4  
Subtotal 17.86 9.77   14.1 0.28   1,745.5 0.0 8,115 49.7  

Aripuanã Project

68,47%

Proven 11.80 3.8 0.3 35.3 1.4 0.3 448.4 35.4 13,392 165.2 113.8
Probable 14.38 3.7 0.2 33.5 1.3 0.3 532.1 28.8 15,488 186.9 138.7
Subtotal 26.18 3.75 0.25 34.3 1.35 0.30 968.7 52.4 28,871 366.5  252.5

Total

Proven 70.41 3.58 0.40 30.0 0.60 0.06 2,522.2 282.2 67,491 424.1 136.0
Probable 50.04 3.85 0.32 30.6 0.73 0.10 1,926.8 158,0 49,2710 364.6 158.6
Total 120.45 3.69 0.37 30.3 0.65 0.08 4,449 440.2 117,211 788.7 294.6

Notes:  1Mineral Reserves are reported using 2014 CIM Definition Standards and have an effective date of December 2018.

2Mineral Reserves are also reported using IG-7 standards in our form 20-F.

Mineral Resources - NI 43-101
  Grade Contained Metal Content
Asset Ownership (%) Class Tonnage Zinc Copper Silver Lead Gold Zinc Copper Silver Lead Gold
(Mt) (%) (%) (g/t) (%) (g/t) (kt) (kt) (koz) (kt) (koz)

Cerro Lindo Mine

80.16%

Measured 1.69 2.14 0.75 28.1 0.29   36.2 12.7 1,527 4.9 0
Indicated 2.06 1.48 0.61 23.7 0.20   30.5 12.6 1,570 4.1 0
Subtotal 3.75 1.78 0.67 25.7 0.24   66.7 25.2 3,096 9.0 0
Inferred 9.33 1.65 0.60 23.4 0.23   153.9 56.0 7,019 21.5 0

El Porvenir Mine

80.16%

Measured 2.46 2.77 0.16 68.1 1.02   68.2 3.9 5,391 25.1 0
Indicated 2.52 2.87 0,18 55.8 0.99   72.4 4.5 4,525 25.0 0
Subtotal 4.98 2.82 0.17 61.9 1.00   140.6 8.5 9,916 50.1 0
Inferred 7.56 3.90 0.23 57.8 0.89   294.7 17.4 14,043 67,3 0

Atacocha Mine (Underground)

72.94%

Measured 0.69 3.25 0.26 64.1 1.28   22.4 1.8 1,421 8.8 0
Indicated 1.53 3.61 0.30 63.8 1.07   55.2 4.6 3,140 16.4 0
Subtotal 2.22 3.50 0.29 63.9 1.14   77.7 6.4 4,561 25.2 0
Inferred 4.95 3.46 0.35 102.7 1.52   171.3 17.3 16,347 75.2 0

Atacocha Mine (Open Pit)

72.94%

Measured 1.47 1.47 0.05 30.1 0.88 0.22 21.6 0.7 1,423 12.9 10.4
Indicated 2.27 1.13 0.05 29.3 0.87 0.23 25.7 1.1 2,141 19.7 16.8
Subtotal 3.74 1.26 0.05 29.6 0.88 0.23 47.3 1.9 3,564 32.8 27.2
Inferred 0.80 1.08 0.03 31.4 0.93 0.50 8.6 0.2 807 7.4 12.9

Vazante Mine

100.00%

Measured 2.84 11.12   11.3 0.29   315.8   1,032 8.2  
Indicated 0.98 8.30   9.0 0.28   81.3   282 2.7 0
Subtotal 3.82 10.40   10.7 0.29   397.1 0.0 1,3124 11.0 0
Inferred 9.02 7.85   11.5 0.22   708.1   3,332 19.8  

Morro Agudo Mine

100.00%

Measured 0.16 6.22     0.19   10.0     0.3  
Indicated 8.52 4.02     0.74   342.5     63.0  
Subtotal 8.68 4.06     0.73   352.5     63.4  
Inferred 4.66 3.64     0.85   169.6     39.6  

Aripuanã Project

68.47%

Measured 1.80 2.48 0.51 24.3 0.84 0.52 44.6 9.2 1,406 15.1 30.1
Indicated 3.90 2.14 0.30 17.5 0.67 0.48 83.5 11.7 2,194 26.1 60.2
Subtotal 5.70 2.25 0.37 19.7 0.72 0.49 128.3 21.1 3,610 41.0 89.8
Inferred 23.10 3.79 0.48 37.0 1.46 0.93 875.5 110.9 27,479 337.3 690.7

Shalipayco Project

60.12%

Measured 3.78 4.18   28.9 0.46   158.0   3,512 17.4  
Indicated 5.69 4.61   32.6 0.50   262.3   5,955 28.5  
Subtotal 9.47 4.41   31.1 0.48   420.3   9,467 45.8  
Inferred 32.38 4.13   31,1 0.47   1,337.3   32,345 152.2  

Magistral Project

80.16%

Measured 84.24   0.56 3.0     0.0 471.7 8,017    
Indicated 121.08   0.50 3.0     0.0 605.4 11,523    
Subtotal 205.32   0.52 3.0     0.0 1,067.7 19,540    
Inferred 50.57   0.43 2.6     0.0 217.5 4,178    

Hilarión Project

80.16%

Measured 27.40 3.71   35.6 0.79   1,016.5 0.0 31,361 216.5  
Indicated 42.00 3.85   28.5 0.65   1,617.0 0.0 38,484 237.0  
Subtotal 69.40 3.79   31.3 0.71   2,630.3 0.0 69,838 492.7  
Inferred 37.50 3.73   29.8 0.65   1,398.8 0.0 35,928 243.8 0

Pukaqaqa Project

80.16%

Measured 107.30   0.43         461.4      
Indicated 201.70   0.39         786.6      
Subtotal 309.00   0.41         1.669      
Inferred 40.10   0.34         136.3      

Florida Canyon Zinc Project

48.90%

Measured 1.29 13.13   19.4 1.66   169.4   805 21.4  
Indicated 1.97 11.59   17.9 1.45   228.3   1,134 28.6  
Subtotal 3.26 12.20   18.5 1.53   397.7   1,940 49.9  
Inferred 8.84 10.15   13.2 1.05   897.3   3,754 92.8  

Caçapava do Sul Project

56.00%

Measured 4.90 1.52   10.0 2.11   74.5 0.0 1,575 103.4  
Indicated 8.11 1.08 0.08 27.0 1.89   87.6 6.5 7,040 153.3  
Subtotal 13.01 1.24 0.05 20.6 1.97   161.3 6.5 8,612 256.3  
Inferred 13.25 0.86 0.12 21.0 1.94   114.0 15.9 8,946 257.1  

Total

Measured 240.02 0.81 0.40 7.4 0.18 0.01 1.937,2 961.4 57,470 434.0 40.5
Indicated 402.33 0.72 0.36 6.0 0.16 0.01 2.886,3 1,433.0 77,989 640.34 77.0
Total 642.35 0.75 0.37 6.6 0.17 0.01 4.823,5 2,394.4 135,458 1,047.4 117.5
Inferred 242.06 2.53 0.24 19.8 0.54 0.09 6.129,1 571.5 154,178 1,314.0 703.6

Notes:  1Mineral Resources are reported exclusive of those Mineral Resources that were converted to Mineral Reserves, using 2014 CIM Definition Standards and have an effective date of December 2018.

X Close
Investor Relations