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United States
Leeville Mine (Carlin Complex)

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 Location:
31 km NW from Carlin, Nevada, United States

  Regional Office:
1655 Mountain City Highway
Elko
Nevada, United States
89801
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Drift & Fill
  • Longhole stoping
  • Cemented backfill
  • Paste backfill
Processing
  • Flotation
  • Concentrate leach
  • Carbon in leach (CIL)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
  • Roasting
The Newmont's Carlin complex consisted of four open pits and four underground mines. The open pits include the Emigrant and the Gold Quarry pits in the South end of the Carlin Trend and the Silverstar and Goldstar pits in the North end of the Carlin Trend. The Emigrant open pit ceased mining operations in December 2018 while residual leaching of gold continues. The underground mines include Leeville, which is a shaft mine, along with Chukar, Pete Bajo and Exodus, which are portal mines.


Owners & OPERATOR

Source: p. 7, 60
CompanyInterestOwnership
Newmont Corp. 38.5 % Indirect
Barrick Gold Corp. (operator) 61.5 % Indirect
Nevada Gold Mines LLC 100 % Direct
Barrick's Goldstrike and Newmont's Carlin operation were contributed to the joint venture and are now collectively referred to as Carlin.

Barrick is the operator of the joint venture and owns 61.5%, with Newmont owning the remaining 38.5% of the joint venture.

Deposit Type

  • Carlin-type
  • Sediment-hosted
  • Hydrothermal
  • Stratabound (SMS)


Summary:

The mineral deposits along the Carlin Trend form a suite of deposits known as Carlin-type. Carlin deposits comprise stratabound disseminated gold mineralization hosted by Silurian-Devonian carbonate rocks that have been metamorphosed to varying extents. The deposits are hydrothermal in origin and are usually structurally controlled.

Gold deposits of the Leeville underground Complex are hosted by lower Paleozoic carbonates of the Devonian Rodeo Creek Formation (Drc), Devonian Popovich Formation (Dp), and Siluro-Devonian Roberts Mountains Formations (SDrm), and a series of highly altered, undifferentiated dikes cross cutting stratigraphy.

Gold mineralization is controlled by a combination of lithology and structure. Intrusive rocks occur as dikes and sills, and locally host mineralization. Lithologic hosts include Rodeo Creek, Popovich, and Roberts Mountains Formations that vary between sub-horizontal to moderately folded. Mineralized material consists of 60 – 90% quartz, 5 - 20% kaolinite, 1 - 17% carbonate, and 3 – 7% pyrite. Gold mineralization in the Leeville complex is wholly refractory.


Mining Methods

  • Drift & Fill
  • Longhole stoping
  • Cemented backfill
  • Paste backfill


Summary:

The Carlin Complex has three major operating underground mines including Goldstrike underground, Leeville and the Portal Mines (including Pete Bajo and Exodus/Northwest Exodus). All mines utilize drift and fill and/or long-hole stoping and are accessed by shaft or portals.

The mining method primarily used on the West Leeville orebody is longhole stoping with typical stopes of dimension 30.5 metres (100 ft) long, 9.1 metres (30 ft) wide and 18.3 metres (60 ft) high. The mining methods employed at the Turf orebody are longhole stoping and underhand cut and fill, depending on what geotechnical constraints allow. Stope geometries for the Turf orebody follow the same constraints as the West Leeville orebody. In the cut and fill areas of the Turf orebody, 4.6 to 5.2 metres (15 to 17 ft) wide primary and secondary drifts will be cut in four 4.6 to 6.1 metres (15 to 20 ft) high lifts, designated A-D.

The Four Corners orebody is designed to be mined with the same methods as those being used on the Turf orebody, but a geotechnical evaluation is being performed to determine mining method improvement. The maximum stope dimensions for the Four Corners orebody have been set at 30.5 metres (100 ft) long, 6.1 metres (20 ft) wide, and 24.4 metres (80 ft) high. In Four Corners orebody cut and fill areas, only 20-ft wide primary drifts will be cut in 4.6 to 6.1 metres (15 to 20 ft) high lifts, A-D.

The Leeville Complex utilizes three forms of backfill:
• Cemented Rock Fill (CRF);
• Uncemented run of mine waste; and
• Paste fill.

Primary stopes mined prior to 2018 were backfilled with CRF, and secondary stopes with uncemented run of mine waste, dependent on future mining plans.

Leeville now uses a surface paste plant and underground reticulated paste fill system. The paste consists of different ratios of crushed aggregate, processing tails and cement slurry. Paste is used to fill the majority of the stope and CRF, as well as for the jamming and capping of backfilled areas. Uncemented run of mine waste will continue to be utilized for secondary stopes and drifts in which future mining is not planned directly adjacent.


Crushing and Grinding


Processing

  • Flotation
  • Concentrate leach
  • Carbon in leach (CIL)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
  • Roasting

Flow Sheet: Subscription required

Summary:

The Mill 5 facility uses a combination of flotation and cyanide leaching to recover gold. The basic steps are as follows:

• Crushing and grinding where ore is ground to the appropriate particle size, usually about 65% -200 mesh;
• Conditioning with a mixture of chemicals to provide for air bubble attachment to pyrite, arsenian pyrite, and arsenopyrite particles while minimizing bubble attachment to gangue minerals such as silica or calcite;
• Froth flotation where the pyrite, arsenian pyrite, and arsenopyrite are floated into a concentrate by sparging air into the conditioned slurry;
• Concentrate is thickened and filtered so that it can be further processed through a separate oxidizing facility such as the Mill 6 roaster or the Sage autoclave;
• Residual gangue or flotation tailings contain sufficient residual gold to warrant CIL processing;
• CIL processing involves leaching of the slurry with cyanide to dissolve the gold and then adsorb the gold o ........


Combined production numbers are reported under Carlin Complex


Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 9 Mt Gold 10.32 g/t 3 M oz
Probable 3.8 Mt Gold 10.63 g/t 1.3 M oz
Measured 13 Mt Gold 8.91 g/t 3.7 M oz
Indicated 5.8 Mt Gold 9.28 g/t 1.7 M oz
Inferred 0.74 Mt Gold 9.1 g/t 0.22 M oz


Heavy Mobile Equipment as of March 25, 2020:
HME TypeQuantity
Bolter 15
Drill 3
Drill (long hole) 4
Loader 14
Personnel Carrier 16

Mine Management:

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


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2018
Form 10-K 2016
Form 10-K 2015
Other 2015
Press Release 2007
Subscription required - Subscription is required.

Aerial view:

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