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Russia
Birkachan Mine (Omolon hub Operation)

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 Location:
225 km N from Evensk, Russia

  Regional Office:
Prospect Narodnogo Opolcheniya 2
St. Petersburg
Russia
198216
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Fax+7-812-753-6376
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit / Underground
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Open stoping
Processing
  • Heap leach
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Carbon in pulp (CIP)
  • Merrill–Crowe
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
The hub comprises of the Kubaka processing plant, three operating mines - Tsokol, Birkachan, Olcha as well as several near-mine development projects with high-grade open-pittable reserves and significant long-term potential.


Owners & OPERATOR

Source: p. 81
CompanyInterestOwnership
Polymetal International plc 100 % Indirect
Omolon Gold Mining Company LLC. (operator) 100 % Direct
Polymetal International plc holds Omolon hub through its 100% subsidiary Omolon Gold Mining Company LLC.

Deposit Type

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


Summary:

The Birkachan mineralisation is located in a 150 to 200 m wide zone. The mineralisation comprises two distinct types: gold-silver veins and disseminated stockwork. The individual veins generally have an average width of up to 2-8 m, extend up to 200-250 m along strike and down-dip and carry gold grades of up to 8 to 14 g/t. The stockwork comprises mineralised zones of 60 to 80 m thick extending 2.5 km along strike and 150 to 200 m down-dip from the surface and grading 1 to 3 g/t of gold. [http://www.minesandprojects.com/reports/annual/Polymetal_International_Omolon_geology_web_2020.jpg]

The Kedon marginal volcanic belt formed on the continental crust in the Middle Paleozoic during a period of 30-35 Ma. Relicts of this volcanic belt are retained as fragments in the Omolon cratonic terraine. The belt is composed of differentiated subaerial red-colored volcanic rocks coupled with compositionally similar subvolcanic and hypabyssal intrusions. The volcanic rocks belong to the calc-alkaline series. There are two types of epithermal volcanic mineralization in the Kedon volcanic belt. Gold mineralization (Au/Ag=1:1-1:5) is developed in the Kubaka, Birkachan, and Elochka deposits. Whereas the gold-silver mineralization (Au/Ag=1:10-1:50) is developed in the Sedoi, Yunyi and Ol'cha deposits. The large Kubaka and Birkachan deposits are characterized by a low content of sulfides (<0.1 and 0.1-0.5%, respectively). The ores are mainly composed of gold, electrum, and pyrite.


Mining Methods

  • Truck & Shovel / Loader
  • Open stoping


Summary:

Following a successful in-fill drilling campaign, open-pit mining recommenced at the Birkachan mine (Omolon) with a view to extending the operation of the heap leach facility.

Kubaka mill processed larger volumes of higher grade ore from the Birkachan and Olcha underground mines.


Crushing and Grinding


Processing

  • Heap leach
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Carbon in pulp (CIP)
  • Merrill–Crowe
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

The hub comprises of the Kubaka processing plant, three operating mines - Tsokol, Birkachan, Olcha as well as several near-mine development projects with high-grade open-pittable reserves and significant long-term potential. All parts of the hub are centred around the 850 Ktpa Kubaka CIP plant, which serves as the processing facility for operating mines in the area and future near-mine feedstock. In addition, the Company operates a 1 Mtpa seasonal heap leaching circuit at the Birkachan mine.


Combined production numbers are reported under Omolon hub Operation

Operational Metrics:

Metrics20192018
Annual processing capacity  ......  Subscription required  ......  Subscription required
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Reserves at January 1, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven 3,610 kt Gold 2.2 g/t 260 koz
Proven 3,610 kt Silver 7 g/t 862 koz
Proven 3,610 kt Gold Equivalent 2.3 g/t 269 koz
Probable 700 kt Gold 7.4 g/t 166 koz
Probable 700 kt Silver 23 g/t 518 koz
Probable 700 kt Gold Equivalent 7.6 g/t 171 koz
Proven & Probable 4,310 kt Gold 3.1 g/t 426 koz
Proven & Probable 4,310 kt Silver 10 g/t 1,380 koz
Proven & Probable 4,310 kt Gold Equivalent 3.2 g/t 440 koz
Measured 410 kt Gold 1.4 g/t 19 koz
Measured 410 kt Silver 5 g/t 71 koz
Measured 410 kt Gold Equivalent 1.5 g/t 19 koz
Indicated 160 kt Gold 14.7 g/t 74 koz
Indicated 160 kt Silver 23 g/t 113 koz
Indicated 160 kt Gold Equivalent 14.9 g/t 75 koz
Total Resource 570 kt Gold 5.1 g/t 92 koz
Total Resource 570 kt Silver 10 g/t 185 koz
Total Resource 570 kt Gold Equivalent 5.2 g/t 94 koz


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 8, 2020
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2010
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Aerial view:

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