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Russia
Dvoinoye Mine (Kupol-Dvoinoye Operation)

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 Location:
124 km SE from Bilibino, Russia

  Regional Office:
6 Rultytegina Str.
685000 Magadan, 13 Proletarskaya Str.
Anadyr
Russia
689000
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Transverse stoping
  • Longitudinal stoping
Processing
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life2020
Mining is expect to finish at Dvoinoye in 2020.


Owners & OPERATOR

Source: p. 36
CompanyInterestOwnership
Kinross Gold Corp. 100 % Indirect
Northern Gold LLC (operator) 100 % Direct
The Dvoinoye mine is owned and operated by Northern Gold LLC, a wholly-owned subsidiary of Kinross.

Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

Dvoinoye Zone 37 is a low sulphidation epithermal gold-silver vein deposit. The principal vein at Dvoinoye, Zone 37, strikes at 040° over a length of at least 800 m. Ore zone width ranges from a few metres to more than 30 m in the central shoot. Zone 37 has been drilled over a vertical extent of about 350 m (including sills). The vein system has a steep to subvertical dip to the southeast. There is evidence that at depth the vein system may shallow in dip, from subvertical to about 70°. There are two main thick quartz veins, within a variably wide envelope of narrower veins and veinlets (stockwork zone). The central shoot represents a blowout in width where the shoot may have a pipe-like form. The bulk of the gold in Zone 37 is in the central shoot. At depth and at the southwestern end, the mineralization forms a series of sub-parallel veins, rather than one or two wide veins. Late to post vein block faults probably disrupt vein continuity along strike, especially to the northeast where the fault-bounded granite intrusion is developed.

Mineralization at Dvoinoye Zone 37 is characterized by low total sulphide content, generally less than one percent, by variable but low gold:silver ratios (average 1:1), and by the presence of considerable free gold in parts of the deposit. The main ore minerals and related sulphides in the vein are native gold, freibergite, pyrite, chalcopyrite, galena, and sphalerite, with minor acanthite. Ore minerals are generally fine-grained. Gold occurs inter-grown with sulphides, free in quartz-illite aggregates, and in places as rare dendritic growth bands.

A wide variety of vein and mineralization textures are recognized from Zone 37 including massive vein, colloform-crustiform banded vein, breccia, and veinlet/stockwork zones. The vein mineralogy consists of quartz-chalcedony (80 to 90%), adularia (5 to 7%), carbonate (up to 5%), illite, and chlorite.

Zone 37 displays a lateral and vertical zonation in mineralization and alteration assemblages, reflecting the evolution of the system spatially and over time. Corbett (2010) describes four styles of gold mineralization that may or may not be spatially separate (Figure 8-1). From earliest to latest these are:

1. Pink quartz gold: Banded quartz veins/breccias with variable quartz textures (crystalline at depth/southwest to chalcedony in northeast), low gold grade, and silver:gold ratio less than 1:1.

2. Carbonate-base metal gold: Sulphide assemblage of pyrite-sphaleritechalcopyrite galena-silver sulphosalts, associated with carbonate (rhodochrosite). Lateral change in sphalerite colour, from red in southwest to white in northeast, indicative of fluid flow direction (hotter to cooler). Silver:gold ratio of 6:1.

3. Chalcedony-ginguro ± adularia gold-silver: Banded veins of chalcedony-opal, pink quartz, minor adularia, and black ginguro bands and spots. Dvoinoye has sparse ginguro development (compared with Kupol). Silver:gold ratio of 2:1.

4. Green quartz breccia: Quartz breccia with altered dyke clasts, contains specks of free high fineness gold, with pyrite. Gold associated with kaolinite and a silver:gold ratio of 1:1.

The chalcedony-ginguro and green quartz breccia types are the biggest volume contributors to Zone 37 mineralization.


Mining Methods

  • Transverse stoping
  • Longitudinal stoping


Summary:

Dvoinoye underground mining operations have used two different mining methods, transverse longhole stoping and longitudinal longhole stoping. Transverse longhole stoping has accounted for more than 90% of the historical production, but the remaining reserves will predominantly be extracted using longitudinal longhole stoping. Mining is expect to finish at Dvoinoye in 2020.


Crushing and Grinding


Processing

  • Gravity separation
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Merrill–Crowe
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Kupol processing plant also processes ore from Dvoinoye. The ores from the two sites are processed in batches, with Dvoinoye ore typically being processed at the start of each month.

The milling process consists of primary crushing and a semi-autogenous grinding (SAG) mill / ball mill grinding circuit, and includes conventional gravity technology followed by whole ore leaching. Merrill-Crowe precipitation is used to produce gold and silver doré bars. Countercurrent decantation (CCD) wash thickeners recover soluble gold and silver, and a cyanide destruction system is used to reduce cyanide concentrations to an acceptable level for disposal. The tailings flow by gravity through a pipeline to a conventional tailings impoundment. Doré bars are shipped to the non ferrous metals plant in Krasnoyarsk. Average mill recovery, based on both Kupol and Dvoinoye ore, is 95% for gold and 85% for silver. The mill availability is 94%.

The mill is designed to process ore on ........


Combined production numbers are reported under Kupol-Dvoinoye Operation

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required665 kt605 kt439 kt
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 1,574 kt Gold 5 g/t 252 koz
Proven 1,574 kt Silver 9.1 g/t 460 koz
Probable 250 kt Gold 10.4 g/t 84 koz
Probable 250 kt Silver 15.9 g/t 128 koz
Proven & Probable 1,824 kt Gold 5.7 g/t 336 koz
Proven & Probable 1,824 kt Silver 10 g/t 588 koz
Measured 5 kt Gold 5.9 g/t 1 koz
Measured 5 kt Silver 7 g/t 1 koz
Indicated 34 kt Gold 12.7 g/t 14 koz
Indicated 34 kt Silver 11.7 g/t 13 koz
Measured & Indicated 39 kt Gold 11.8 g/t 15 koz
Measured & Indicated 39 kt Silver 11 g/t 14 koz
Inferred 49 kt Gold 26.8 g/t 43 koz
Inferred 49 kt Silver 23 g/t 37 koz

Financials:

Units2019201820172016201520142013
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 14.5   34.1   28.6  
Subscription required - Subscription is required


Heavy Mobile Equipment as of March 31, 2015:
HME TypeModelSizeQuantity
Dozer (crawler) ....................... Subscription required 2
Drill ....................... Subscription required 5
Drill ....................... Subscription required 2
Drill ....................... Subscription required 1
Drill jumbo (two boom) ....................... Subscription required 3
Excavator ....................... Subscription required 1
Loader ....................... Subscription required 2
Load-Haul-Dump (LHD) ....................... Subscription required 1
Load-Haul-Dump (LHD) ....................... Subscription required 5
Load-Haul-Dump (LHD) ....................... Subscription required 1
Truck (haul) ....................... Subscription required 20 t 3
Truck (haul) ....................... Subscription required 40 t 15
Underground truck ....................... Subscription required 2
Underground truck ....................... Subscription required 4
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Feb 17, 2020
....................... Subscription required ....................... Subscription required Subscription required Feb 17, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Technical Report 2015
Annual Report 2014
Subscription required - Subscription is required.

Aerial view:

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