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Argentina
Gualcamayo Mine

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 Location:
21 km S from Guandacol, Argentina

  Regional Office:
Gral. Paz No. 558 Oeste
San Juan
Argentina
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  • Overview
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  • Geology
  • Mining
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  • Costs & Financials
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Overview

StageProduction
Mine TypeOpen Pit & Underground
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Sub-level caving
Production Start...
Mine Life1.5 years (as of Jan 1, 2021)


Owners

Source: p. 11
CompanyInterestOwnership
Minas Argentinas S.A (operator) 100 % Direct
Mineros S.A. 100 % Indirect

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Skarn
  • Sediment-hosted
  • Porphyry


Summary:

Gold mineralization at the Gualcamayo Property occurs in three main areas: Quebrada del Diablo (QDD), Las Vacas (LV), and Salamanca. The QDD area includes the QDD Main, Condor, Potenciales, Amelia Inés and Magdalena (together AIM), Target D, QDD Lower, and Rodado deposits. There are also a number of small satellite deposits not currently included in the mine plan.

Three distinct mineralization types of economic interest occur in the Gualcamayo Property:
• sediment-hosted distal-disseminated gold (QDD);
• sulphide-bearing skarn deposits containing copper zinc and molybdenum with late stage gold-arsenic mineralization (Amelia Inés and Magdalena);
• porphyry style molybdenum mineralization (Quebrada Perdida).

Gold mineralization at QDD occurs in carbonate sedimentary rocks within conformable and discordant carbonate breccias and fractured limestone. The gold mineralization is related to a hydrothermal event overprinting the proximal skarns and extending into the surrounding marbles and limestones. The QDD canyon itself lies along a fault/dyke system, which is believed to be a reactivated, Ordovician rift structure that acted as the primary conduit for hydrothermal fluids migrating away from the intrusive contacts.

The mineralizing fluids were dispersed into a semi conformable, receptive limestone aquifer traveling up dip following the hydraulic gradient, more than 600 m away from the QDD feeder structure. The permeability was provi ........


Mining Methods

  • Truck & Shovel / Loader
  • Sub-level caving


Summary:

The Gualcamayo Mine consists of three operating open pits, QDD Main, AIM, and Condor, and one operating underground mine, QDD Lower. The operation also includes crushing facilities, an adsorption, desorption and recovery (ADR) plant, heap leach pads; and accommodation camp, maintenance buildings, and office buildings. The Deep Carbonates Project (DCP), which consists of the Santiago, Feeder, and Rodado deposits, is the primary target for future expansion.

The current Life of Mine (LOM) plan is for three years of mining and processing. Mineros intends to expand the current Mineral Reserves and further develop the DCP as an underground mine.

OPEN PIT MINING
Open pit mining takes place in various distinct areas of the Gualcamayo Mine, including a central, large open pit area, and three small satellite workings. As the deposits are located against a mountainside, the open pit operation is a combination of hillside benches and in pit benches. Most of the ore haul is downgrade.

Open pit ore production employs standard drill and blast, load and haul operational procedures. Mining is carried out on 10 m bench heights, with some pit walls left with a double bench.

Material is loaded and transported to an ore pass, on the edge of the QDD Main pit, which delivers the material to an underground primary crusher, where it is combined with underground ore. The ore is then conveyed to a secondary crushing system on surface, after which it is ........


Crushing and Grinding
Flow Sheet: Source

Ore is mined in the open pit and underground mines, with the primary crusher located underground. Open pit ore is dumped from the surface either into an ore pass or an ore chute, both of which deliver the ore to the underground primary crushing and conveying system. The primary crusher reduces the ore to P80 150 mm. Crushed ore is transported via overland conveyor to the crushed ore stockpile. Ore is drawn from the crushed ore stockpile with apron feeders and conveyed to the secondary-tertiary crushing circuit. Ore is screened on the secondary screen, with oversized material fed to the secondary crusher. The secondary crusher product is then conveyed to the tertiary crushers which are closed by the tertiary screens. The screen undersized product, with P80 25 mm from the secondary and tertiary screens is conveyed to the heap leach pad.


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required92154164
Silver oz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20212020201920172016
Tonnes processed  ......  Subscription required  ......  Subscription required7,433,725 t7,570,007 t
Daily processing capacity  ......  Subscription required  ......  Subscription required25,000 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required6,692,600 t8,387,882 t
Waste  ......  Subscription required  ......  Subscription required11,909,041 t10,650,620 t
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Reserves at December 31, 2021:
Mineral Resources are estimated at cut-off grades between 0.20 g/t Au and 0.40 g/t Au for open pit and between 0.63 g/t Au and 1.85 g/t Au for underground.

Open pit Mineral Reserves are based on mine designs carried out on an updated resource model, applying a dilution and mining loss factor of 2% and 88%, 6% and 86%, and 5% and 91% at zero grade for the QDD Main, AIM, and Target D deposits, respectively. The following marginal cut-off grades were applied:
- QDD - 0.32 g/t Au;
- Target D – 0.40 g/t Au;
- Magdalena – 0.52 g/t Au;
- Stockpiles – same cut-off grade as source material.
A cut-off grade of 0.84 g/t Au was applied to the underground mine designs.

CategoryTonnage CommodityGradeContained Metal
Proven 1,833 kt Gold 1.64 g/t 97 koz
Probable 362 kt Gold 2.23 g/t 26 koz
Proven & Probable 2,195 kt Gold 1.74 g/t 123 koz
Measured & Indicated 26,316 kt Gold 1.93 g/t 1,635 koz
Inferred 16,099 kt Gold 2.29 g/t 1,183 koz

Commodity Production Costs:

CommodityUnits202220212020201920172016
Cash costs (sold) Gold USD  ......  Subscription required 942 / oz   796 / oz  
Cash costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (sold) Gold USD  ......  Subscription required 990 / oz   847 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units20212020201920172016
Capital expenditures M USD  ......  Subscription required 23.6   21.8  
Sustaining costs M USD  ......  Subscription required 6.6   6.7  
Revenue M USD  ......  Subscription required  ......  Subscription required 188.6   205.9  
Gross profit M USD  ......  Subscription required  ......  Subscription required
After-tax Income M USD -265.8   30.3  
EBITDA M USD  ......  Subscription required
Subscription required - Subscription is required


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment as of September 15, 2021:
HME TypeModelSizeQuantity
Bolter ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required 70 t ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required 89 mm ....................... Subscription required
Drill ....................... Subscription required 762 mm ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required 2.5 cu. m ....................... Subscription required
Excavator ....................... Subscription required 6.9 cu. m ....................... Subscription required
Grader ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required 2.5 cu. m ....................... Subscription required
Loader (FEL) ....................... Subscription required 6.4 cu. m ....................... Subscription required
Loader (FEL) ....................... Subscription required 3 cu. m ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 6.3 cu. m ....................... Subscription required
Scissor Lift ....................... Subscription required
Shotcreter ....................... Subscription required ....................... Subscription required
Truck (dump) ....................... Subscription required 36 t ....................... Subscription required
Truck (water) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 5, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Press Release 2018
Press Release 2018
Corporate Presentation 2017
Financial Review 2017
Management Discussion & Analysis 2017
Annual Report 2016
Annual Report 2015
Other 2014
Technical Report 2011
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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