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Kazakhstan
Varvara hub Operation (Komar Mine, Varvara Mine)

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 Location:
130 km SW from Kostanai, Kazakhstan

  Regional Office:
Prospect Narodnogo Opolcheniya 2
St. Petersburg
Russia
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
  • Copper
Mining Method
  • Truck & Shovel / Loader
  • Dragline
Processing
  • Crush & Screen plant
  • Carbon re-activation kiln
  • Dewatering
  • Flotation
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2036


Owners

Source: p. 87
CompanyInterestOwnership
Polymetal International plc 100 % Indirect
Polymetal International plc holds Varvara through its 100% subsidiary Varvarinskoye JSC and Komar through its 100% subsidiary Komarovskoye Mining Company LLC.

Deposit Type

  • Skarn
  • Contact-metasomatic


Summary:

The mineralized bodies at Varvarinskoye are classic gold-copper skarn types that are primarily contained within the eastern side of the local fault and are associated with the border between geological formations. Copper-gold porphyry is overlaid with quartz-sulphide gold veins and scarn to produce very complex and geometrically complicated zones of economic mineralisation. Mineralisation is discontinuous over a strike length of 4 km and is divided into five zones.

The main primary copper mineral is chalcopyrite with some bornite. The gold is mostly in free form and associated with pyrites and other sulphides. A hallow oxidation zone occurs within 10 to 50 m below the surface. In this part of the Varvara deposit, copper is mostly represented by oxide minerals not amenable to conventional flotation.

Based on mineralogy and metallurgical characteristics, all mineralisation is divided into four types based on the degree of oxidation and copper grade:

1. primary gold (copper less than 0.2 per cent.);
2. primary copper (with gold present);
3. oxide gold (copper less than 0.1 per cent.);
4. oxide copper (with gold present).

Types 1 and 3 are processed through the leaching circuit and are known as leach ore. Type 2 is processed through the flotation circuit and is known as float ore. Type 4 is currently stockpiled separately and not processed.

Komarovskoye is a low-sulphide quartz gold deposit located along the contact of the granite intrusion. Mineralisation occurs within the fault zone and consists of steeply dipping quartz-carbonate-micaceous metasomatites hosted by schists. The overall strike length of Komarovskoye is approximately 6,800m with individual mineralised zones generally 500-600m in length, 4-6m in width. Oxidation depth is limited to 30-50m below surface.


Mining Methods

  • Truck & Shovel / Loader
  • Dragline


Summary:

The Varvara deposit is elongated in a northeastern direction and has a length of up to 4.5 m and a width of 1.2 km.

Development of reserves is carried out by "Ugo-Zapadny", "Severo-Vostochny-3" and "Prirechny" open pits.

Excavation of rock is carried out in 5-10 m benches. Draglines and shovels are utilized for extraction-and-loading operations in pit and wheel loaders in stockpiles. Ore and waste haulage is carried out via Cat777 and KOMATSU HD 785 haulage trucks.

Drilling and blasting operations are carried out by contractor.

Separate storage of ores is carried out at the Varvara, depending on the grades of ore and the content of the useful component.

Komar ore is mined via conventional truck-shovel and drill-and-blast methods.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
SAG mill
Ball mill

Summary:

Run-of-mine ore is crushed in batches in a single jaw crusher, with separate crushed ore storage for leach and float material.

The float ore circuit comprises two-stage milling (SAG mill and ball mill).

The leach ore circuit comprises two-stage milling.


Processing

  • Crush & Screen plant
  • Carbon re-activation kiln
  • Dewatering
  • Flotation
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

Varvara’s processing facilities are located at a single site. Varvara has two distinct ore types based on their copper content. Run-of-mine ore is crushed in batches in a single jaw crusher, with separate crushed ore storage for leach and float material. Gold doré and gold-copper concentrate are produced from the two circuits of the single processing plant.

The float ore circuit comprises two-stage milling (SAG mill and ball mill) and conventional flotation. Concentrate is thickened, filtered, packed in big bags and trucked to a railway spur for transport to the off-taker.

The leach ore circuit comprises two-stage milling, conventional CIP leaching, carbon desorption, carbon regeneration, electrolysis and smelting. The ultimate product is gold dore.

Ore containing more than 0.2% copper (float material) goes to a 1,050 ktpa flotation circuit with the final product being a gold-copper concentrate which is sold to an off-taker.

Ore containing le ........

Recoveries & Grades:

CommodityParameter2020201920182017
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required88.183.4
Gold Head Grade, %  ......  Subscription required  ......  Subscription required1.41.4
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required92.283.1
Copper Head Grade, %  ......  Subscription required  ......  Subscription required0.480.61

Production:

CommodityProductUnits2020201920182017
Gold Metal in concentrate koz  ......  Subscription required  ......  Subscription required129.2
Gold Metal in doré koz  ......  Subscription required  ......  Subscription required118114
Gold Metal in conc./ doré koz  ......  Subscription required  ......  Subscription required130123
Gold Equivalent Metal in conc./ doré koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Metal in concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018
Ore tonnes mined  ......  Subscription required3,943 kt3,139 kt
Waste  ......  Subscription required45.4 Mt28.7 Mt
Tonnes processed  ......  Subscription required3,550 kt3,534 kt
Annual processing capacity  ......  Subscription required4.2 Mt4 Mt
Subscription required - Subscription is required.

Reserves at January 1, 2021:

CategoryTonnage CommodityGradeContained Metal
Proven 23,620 kt Gold 693 koz
Proven 23,620 kt Copper 31.4 kt
Proven 23,620 kt Gold Equivalent 0.9 g/t 693 koz
Probable 21,560 kt Gold 1,036 koz
Probable 21,560 kt Copper 9.3 kt
Probable 21,560 kt Gold Equivalent 1.5 g/t 1,036 koz
Proven & Probable 45,180 kt Gold 1,729 koz
Proven & Probable 45,180 kt Copper 40.6 kt
Proven & Probable 45,180 kt Gold Equivalent 1.2 g/t 1,729 koz
Measured 3,020 kt Gold 107 koz
Measured 3,020 kt Copper 3.6 kt
Measured 3,020 kt Gold Equivalent 1.1 g/t 107 koz
Indicated 15,450 kt Gold 837 koz
Indicated 15,450 kt Copper 8.3 kt
Indicated 15,450 kt Gold Equivalent 1.7 g/t 837 koz
Measured & Indicated 18,470 kt Gold 944 koz
Measured & Indicated 18,470 kt Copper 11.9 kt
Measured & Indicated 18,470 kt Gold Equivalent 1.6 g/t 944 koz
Inferred 6,320 kt Gold 337 koz
Inferred 6,320 kt Copper 4.3 kt
Inferred 6,320 kt Gold Equivalent 1.7 g/t 337 koz
Total Resource 24,790 kt Gold 1,281 koz
Total Resource 24,790 kt Copper 16.2 kt
Total Resource 24,790 kt Gold Equivalent 1.6 g/t 1,281 koz

Commodity Production Costs:

CommodityUnits2020201920182017
Total cash costs Gold Equivalent USD  ......  Subscription required  ......  Subscription required 688 / oz 701 / oz
All-in sustaining costs (AISC) Gold Equivalent USD  ......  Subscription required  ......  Subscription required 940 / oz 952 / oz
Subscription required - Subscription is required.

Financials:

Units2020201920182017
Sustaining costs M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required38   19  
Revenue M USD  ......  Subscription required  ......  Subscription required178   154  
EBITDA M USD  ......  Subscription required  ......  Subscription required77   68  
Subscription required - Subscription is required


Heavy Mobile Equipment as of January 1, 2021:
HME TypeModelSizeLeased or
Contractor
Bulldozer ....................... Subscription required
Bulldozer ....................... Subscription required
Dragline 10 cu. m
Drill ....................... Subscription required Leased
Excavator ....................... Subscription required
Excavator ....................... Subscription required
Excavator ....................... Subscription required
Grader ....................... Subscription required
Loader ....................... Subscription required
Loader ....................... Subscription required
Loader ....................... Subscription required
Truck (haul) ....................... Subscription required
Truck (haul) ....................... Subscription required 91 t
Truck (water) ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 25, 2021
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2020
Subscription required 2019
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Quarterly Report 2018
Subscription required - Subscription is required.

Aerial view:

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