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Peru
La Zanja Mine

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 Location:
44 km N from Chilete, Peru

  Regional Office:
Las Begonias 415, 19th Floor, San Isidro
Lima
Peru
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • ROM/dump leach
  • Carbon in column (CIC)
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life2021


Owners & OPERATOR

Source: p. 56, 151
CompanyInterestOwnership
Newmont Corp. 46.94 % Indirect
Compania de Minas Buenaventura S.A.A. (operator) 53.06 % Indirect
Compañía de Minas Buenaventura S.A.A. held a 53.06% interest in Minera La Zanja, S.R.L., which operates La Zanja mining unit. The remaining interest is held by Newmont 46.94%.

Deposit Type

  • Porphyry
  • Epithermal


Summary:

Epithermal gold mineralization in oxides associated with dome edges in San Pedro and Pampa Verde deposits. Additionally, several low and intermediate-sulfidation vein systems have been recognized on the periphery, as well as copper/molybdenum/gold mineralization related to porphyry-type systems.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining is performed via open pit, for which there are currently two pits in exploitation: San Pedro Sur and Pampa Verde. The height of the operating benches is 6 m and 12 m for th final slope, with an angle ranging from 36° to 54°. Ore is transported directly to the San Pedro Sur leach pad, 3 km from the San Pedro Sur pit and 10 km from the Pampa Verde pit. The barren material is transported to deposits located near each open pit. The material is loaded using 3 m3 excavators, and hauled using trucks with a capacity of 20 m3.


Crushing and Grinding


Processing

  • ROM/dump leach
  • Carbon in column (CIC)
  • Merrill–Crowe
  • Cyanide (reagent)

Source: Subscription required

Summary:

The metallurgical process at La Zanja consists of leaching the ROM ore (obtained from blasting in the open pit) in the leaching heap using a cyanide solution. The solution is collected via pipes and sent to the processing plant. At the plant, two processes are performed: Merrill Crowe (zinc precipitation) and activated carbon adsorption. The precipitate obtained in the Merrill-Crowe plant and the carbon loaded with ore from adsorption plant are sent to Minera Yanacocha, where the eluent solution is desorbed and smelted, and the precipitate is smelted, obtaining doré bars.

Recoveries & Grades:

CommodityParameter20192018201720162015
Gold Head Grade, g/t 0.460.460.480.750.7
Silver Head Grade, g/t 6.737.466.223.955.97

Production:

CommodityUnits202020192018201720162015
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required127140141
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required9,317,652 t8,576,614 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 354,424 t Gold 0.4 g/t 4,600 oz
Proven 354,424 t Silver 9.05 g/t 103,135 oz
Probable 205,741 t Gold 0.423 g/t 2,801 oz
Probable 205,741 t Silver 7.31 g/t 48,386 oz
Proven & Probable 560,177 t Gold 0.41 g/t 7,401 oz
Proven & Probable 560,177 t Silver 8.41 g/t 151,521 oz

Commodity Production Costs:

CommodityUnits20192018201720162015
Cash costs (sold) Silver USD  ......  Subscription required  ......  Subscription required 10.7 / oz 8.01 / oz 10.1 / oz
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 789 / oz 607 / oz 753 / oz
Subscription required - Subscription is required.

Financials:

Units20192018201720162015
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 27.7  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 161.01  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -69.27  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -52.36  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -74.91  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -69.21  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 16, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 16, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 16, 2020
....................... Subscription required ....................... Subscription required Subscription required Apr 16, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Form 20-F 2017
Annual Report 2016
Form 20-F 2016
Subscription required - Subscription is required.

Aerial view:

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