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Fazenda Mine

  • Overview
  • Geology and Mineralization
  • Technical Report
  • Image Gallery
  • Reserves and Resources
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Overview

The Fazenda mine is located within the Maria Preta mining district in Bahia State, Brazil, about 180 kilometres northwest of the state capital city of Salvador. The mine covers approximately 63,400 ha, and is accessible by air and road. The Fazenda mine has been in operations for more than 30 years  and is primarily an underground operation being mined by conventional retreat longitudinal longhole open stoping with a 1.3 Mtpa carbon-in-leach (CIL) milling facility.

Geology and Mineralization

Fazenda is located within the Rio Itapicurú Greenstone Belt (RIGB), a 100 kilometre long, 60 kilometre wide north-south trending volcano-sedimentary belt situated within the São Francisco Craton. Fazenda is an epigenetic, structurally controlled, and hydrothermally altered Precambrian quartz vein hosted lode gold deposit that has been subjected to greenschist facies metamorphism. The main mineralization is in the form of sulphide-bearing quartz veining, and these multiple vein systems vary in true width from 1.5 to 40 metres and horizontal mining widths vary from a minimum 3 to 40 metres.

Reserves and Resources

Mineral Reserves (May 31, 2018)

Classification Tonnes (kt) Gold grade (g/t) Contained Gold (koz)
Proven – underground 1,456 1.94 91
Proven – open pit 1,176 1.57 59
Total Proven 2,632 1.77 150
       
Probable – underground 2,726 1.91 168
Probable – open pit 29 1.64 2
Total Probable 2,756 1.91 169
       
Total Proven and Probable 5,387 1.84 319

Notes:

  1. CIM (2014) definitions were followed for Mineral Reserves.
  2. Mineral Reserves are reported at a cut-off grade of 1.29 g/t Au for underground and 0.64 g/t Au to 0.72 g/t Au for open pit.
  3. Mineral Reserves are reported using a long-term gold price of US$1,200/oz and exchange rate of R$3.70 = US$1.00.
  4. A minimum mining width of 3.0 m was used for underground Mineral Reserves.
  5. Bulk density ranges from 2.72 t/m3 to 3.00 t/m3.
  6. Numbers may not add due to rounding.

Mineral Resources (May 31, 2018)

Classification Tonnes (kt) Gold grade (g/t) Contained gold (koz)
Measured – underground 3,700 2.35 280
Measured – open pit 1,170 1.57 59
Total Measured 4,870 2.17 339
       
Indicated – underground 2,370 2.66 203
Indicated – open pit 300 1.63 16
Total Indicated 2,670 2.55 219
       
Measured and Indicated – underground 6,070 2.47 483
Measured and Indicated – open pit 1,470 1.59 75
Total Measured and Indicated 7,540 2.30 558
       
Inferred – underground 5,260 2.58 436
Inferred – open pit 780 1.61 40
Total Inferred 6,040 2.45 476

Notes:

  1. CIM (2014) definitions were followed for Mineral Resources.
  2. Mineral Resources are reported at a cut-off grade of 0.40 g/t Au for open pit and 1.0 g/t Au for underground.
  3. Mineral Resources are inclusive of Mineral Reserves.
  4. Mineral Resources are estimated using US$1,500/oz gold price, exchange rate of R$3.70 = US$1.00 and constrained by a pit shell.
  5. A minimum mining width of 1.0 m was used for underground Mineral Resources.
  6. Bulk density ranges from 2.72 t/m3 to 3.00 t/m3.
  7. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
  8. Numbers may not add due to rounding.
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