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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
Production Start...
The Leeville mine is part of the Carlin complex.


Owners

Source: p. 76-78
CompanyInterestOwnership
Newmont Corp. 38.5 % Indirect
Barrick Gold Corp. (operator) 61.5 % Indirect
On July 1, 2019, Barrick's Goldstrike and Newmont's Carlin operation were contributed to the Nevada Gold Mines joint venture and are now collectively referred to as Carlin.

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

Contractors

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Deposit Type

  • Carlin-type
  • Sediment-hosted
  • Hydrothermal
  • Stratabound


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:
• Ce ........


Crushing and Grinding


Processing

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Summary:

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Combined production numbers are reported under Carlin Complex


Reserves at December 31, 2019:
The cut-off grades for the three ore bodies for reserves (US$1,200/ounce gold price) are 5.55 g/t for West Leeville, 6.31 to 7.3 g/t for Turf, and 7.99 g/t for Four Corners.

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
Proven & Probable 13 Mt Gold 10.41 g/t 4.3 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
Measured & Indicated 19 Mt Gold 9.03 g/t 5.4 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 ....................... Subscription required
Drill ....................... Subscription required
Drill (long hole) ....................... Subscription required
Loader ....................... Subscription required
Personnel Carrier ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 5, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 5, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Form 10-K 2018
Form 10-K 2016
Form 10-K 2015
Other 2015
Press Release 2007
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