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Argentina
Cerro Negro Mine

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 Location:
172 km W from Pico Truncado, Argentina

  Address:
Av. San Martin 1207
Perito Moreno
Argentina
Z9040
Phone  ...  Subscription required
Fax+54-2963-432696
WebsiteWeb
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  • Overview
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  • Mining
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  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Sub-level stoping
  • Transverse stoping
  • Avoca
  • Longitudinal stoping
  • Cemented backfill
Production Start...
Mine Life2026
The first expansion at Cerro Negro includes the development of the Marianas and Eastern districts, adding production starting in 2024.


Owners

Source: p. 41
CompanyInterestOwnership
Newmont Corp. 100 % Indirect
Oroplata S.A. (operator) 100 % Direct
Oroplata S.A. has been the Argentine subsidiary of the Canadian holding Goldcorp Inc. since September 2010. It wholly owns and operates the Cerro Negro gold project.

Newmont acquired Cerro Negro in 2019 in the Newmont Goldcorp transaction.

Contractors

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Deposit Type

  • Breccia pipe / Stockwork
  • Vein / narrow vein
  • Epithermal


Summary:

The deposits within the Cerro Negro Operations are considered to be examples of lowsulphidation, epithermal gold–silver deposits.

Mineralization characteristically comprises pyrite, electrum, gold, silver, and argentite. Other minerals can include chalcopyrite, sphalerite, galena, tetrahedrite, and silver sulphosalt and/or selenide minerals. In alkalic host rocks, tellurides, roscoelite, and fluorite may be abundant, with lesser molybdenite as an accessory mineral.

Deposits are typically zoned vertically over about a 250 m to 350 m interval, from a base metal poor, gold–silver-rich top to a relatively silver-rich base metal zone and an underlying base metal-rich zone grading at depth into a sparse base metal, pyritic zone. From surface to depth, metal zones grade from gold–silver–arsenic–antimony–mercuryrich zones to gold–silver–lead–zinc–copper-rich zones, to basal silver–lead–zinc-rich zones.

Silicification is the most common alteration type with multiple generations of quartz and chalcedony, which are typically accompanied by adularia and calcite. Pervasive silicification in vein envelopes is flanked by sericite–illite–kaolinite assemblages. Kaolinite illite–montmorillonite ± smectite (intermediate argillic alteration) can form adjacent to veins; kaolinite–alunite (advanced argillic alteration) may form along the tops of mineralized zones. Propylitic alteration dominates at depth and along the deposit margins.

Vein mineralogy d ........


Mining Methods

  • Sub-level stoping
  • Transverse stoping
  • Avoca
  • Longitudinal stoping
  • Cemented backfill


Summary:

The Cerro Negro Operations host the Eureka, Mariana Norte, Mariana Central, San Marcos and Bajo Negro zones that are, or will be, exploited using underground mining methods, and the Vein Zone, to be mined via open pit methods. Currently, active mining is taking place at the Eureka and Mariana Central zones.

A combination of transverse and longitudinal long-hole sublevel stoping methods with cemented rock backfill are currently being used at the Eureka and Mariana Central mines. The determination of which method is used is made based on geometries and the rock quality. Generally, transverse stoping is used in wider ore zones and areas where high grades along the contact require parallel drilling. Longitudinal stoping is used whenever practical in narrower zones to reduce development requirements. In certain areas, a modified Avoca mining method is used, which constitutes a longitudinal long-hole method with a rolling backfill front following the mining of ore in a single direction along strike. These methods are planned to be used to mine the other underground deposits at Cerro Negro Mine.

Ore extraction is carried out by load–haul–dump vehicles with capacities ranging from 4.0 cubic metres to 5.4 cubic metres. These units muck the ore from the stopes and haul it to a temporary stockpile located in the haulage drift or directly to trucks. Then the ore is loaded into trucks with capacities between 33 tonnes and 40 tonnes to be hauled to the surface and dum ........


Crushing and Grinding
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Processing

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Summary:

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Production:
Cerro Negro produced 334,000 ounces of gold in 2019 since the completion of the acquisition of the mine site as part of the Newmont Goldcorp transaction on April 18, 2019.

CommodityProductUnits2022202120202019201820172016
Gold Metal in doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Payable metal koz 489452363
Silver Payable metal koz  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Equivalent Payable metal koz  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required963 k tons811 kt
Tonnes milled  ......  Subscription required  ......  Subscription required969 k tons1,126 kt1,031 kt827 kt
Daily milling capacity  ......  Subscription required  ......  Subscription required4,000 t
Subscription required - Subscription is required.

Reserves at December 31, 2021:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Total 1,800 kt Gold 8.93 g/t 500 koz
Proven Total 1,700 kt Silver 71.26 g/t 4,010 koz
Probable Total 7,200 kt Gold 8.88 g/t 2,060 koz
Probable Total 7,200 kt Silver 54.16 g/t 12,540 koz
Proven & Probable Total 9,000 kt Gold 8.89 g/t 2,560 koz
Proven & Probable Total 8,900 kt Silver 57.51 g/t 16,550 koz
Measured & Indicated In-Situ (OP) 1,900 kt Gold 4.24 g/t 250 koz
Measured & Indicated In-Situ (UG) 1,400 kt Gold 7.25 g/t 320 koz
Measured & Indicated Total 3,300 kt Gold 5.52 g/t 570 koz
Measured & Indicated In-Situ (OP) 1,900 kt Silver 8.18 g/t 490 koz
Measured & Indicated In-Situ (UG) 1,400 kt Silver 56.55 g/t 250 koz
Measured & Indicated Total 3,300 kt Silver 28.76 g/t 2,990 koz
Inferred In-Situ (OP) 100 kt Gold 3.49 g/t 10 koz
Inferred In-Situ (UG) 7,500 kt Gold 6.85 g/t 1,650 koz
Inferred Total 7,600 kt Gold 6.82 g/t 1,660 koz
Inferred In-Situ (OP) 100 kt Silver 11.07 g/t 20 koz
Inferred In-Situ (UG) 7,500 kt Silver 39.04 g/t 9,400 koz
Inferred Total 7,600 kt Silver 38.8 g/t 9,420 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Credits (by-product) Gold USD  ......  Subscription required
Total cash costs Gold USD 497 / oz   523 / oz   574 / oz  
Total cash costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
Total cash costs Gold USD 431 / oz†   457 / oz†   505 / oz†  
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold USD 535 / oz†   684 / oz†   705 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Operating Costs:

Units20162015
UG mining costs ($/t milled) USD 102.42108.77
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required 39   79   68  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 77   87   97  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 641   609   532  
Operating Income M USD 103   84   52  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
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Heavy Mobile Equipment:
HME TypeModelSizeQuantityRef. Date
Drill (long hole) ....................... Subscription required ....................... Subscription required Dec 31, 2015
Drill (long hole) ....................... Subscription required ....................... Subscription required Dec 31, 2015
Drill (long hole) ....................... Subscription required ....................... Subscription required Dec 31, 2015
Drill (long hole) ....................... Subscription required ....................... Subscription required Dec 31, 2015
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required Dec 31, 2015
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required Dec 31, 2015
Excavator ....................... Subscription required 37.5 t ....................... Subscription required Dec 31, 2015
Loader (FEL) ....................... Subscription required 5.5 cu. m ....................... Subscription required Dec 31, 2015
Load-Haul-Dump (LHD) ....................... Subscription required Dec 31, 2021
Truck (haul) ....................... Subscription required Dec 31, 2021
Truck (underground) 40 t ....................... Subscription required Dec 31, 2021
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2022
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Staff:

Total WorkforceYear
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Corporate Presentation 2018
Management Discussion & Analysis 2018
Year-end Mineral Reserves 2018
Annual Information Form 2017
Annual Report 2017
Press Release 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Annual Information Form 2015
Corporate Presentation 2015
Technical Report 2015
Annual Report 2014
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