Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Processing |
- Heap leach
- Counter current decantation (CCD)
- Carbon in column (CIC)
- Cyanide (reagent)
|
| Mine Life | 8 years (as of Jan 1, 2016) |
On July 1, 2019, Long Canyon was contributed to Nevada Gold Mines, a joint venture between Barrick (61.5%) and Newmont (38.5%). |
Source:
p. 72
On March 10, 2019, Barrick entered into an implementation agreement with Newmont to create a joint venture, named Nevada Gold Mines.
On July 1, 2019, Long Canyon was contributed to Nevada Gold Mines, a joint venture between Barrick and Newmont.
Nevada Gold Mines include Barrick’s Cortez, Goldstrike, Turquoise Ridge and Goldrush properties and Newmont’s Carlin, Twin Creeks, Phoenix, Long Canyon and Lone Tree properties.
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
Summary:
Long Canyon is a sediment-hosted disseminated gold deposit.
The gold mineralization at Long Canyon is best described as sediment-hosted, Carlin-type gold mineralization.
The mineralization identified at Long Canyon shares many of the characteristics of Carlin-type gold mineralization, including:
• Stratigraphic control on mineralization - mineralization is hosted primarily in limestone, particularly in silty, thin-bedded units;
• Structural control on mineralization - mineralization occurs in karstic cavities, collapse breccias, and anticlinal fold hinges;
• Geochemical association - elevated arsenic, mercury, antimony, and thallium accompany the gold mineralization, while silver and base-metal concentrations are low; and
• Alteration - mineralization is associated with decalcification, silicification/jasperoid, oxidized variants of pyrite and arsenical pyrite or arsenopyrite, and clay alteration.
The Long Canyon project also displays some characteristics that are unlike typical Carlin-type gold deposits. The prevalent association of hematite with gold mineralization at Long Canyon is not a common characteristic among all Carlin-type deposits, although this phenomenon is associated with weathered/oxidized portions of some of the deposits.
Summary:
Long Canyon is an open pit operation located approximately 75 miles east of Elko, Nevada.
Processing
- Heap leach
- Counter current decantation (CCD)
- Carbon in column (CIC)
- Cyanide (reagent)
Flow Sheet:
Summary:
Oxide ore with suitable cyanide solubility is treated on a heap leach pad.
Long Canyon is permitted to process up to 5 million tons of ore annually, with developments that consist of:
* an open pit;
* a heap leach facility (HLF);
* a carbon-in-column (CIC) plant;
* a waste rock storage facility (WRSF); and
* support facilities including a truck shop and administration building.
A dilute sodium cyanide solution is applied to the stacked ore on the high-density polyethylene (HDPE) lined leach pads. Pregnant solution from the leach pads is collected in perforated piping under the leach pad, and reports to main collection headers that lie in a HDPE-lined Solution Collection Channel along the edge of the heap leach pad. The collection headers report to a Pregnant Solution Tank (PST), and a Process Solution Pond (PSP) is available for solution in case of upset plant operating conditions. The PSP has a total capacity of 17.4 million gallons, and ........
Recoveries & Grades:
| Commodity | Parameter | 2020 | 2019 |
|
Gold
|
Head Grade, g/t
| 1.95 | 1.04 |
Reserves at December 31, 2020:
The Numbers in the Annual Report 2020 are given on 61.5% basis.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
0.86 Mt
|
Gold
|
2.04 g/t
|
0.06 M oz
|
|
Probable
|
4.2 Mt
|
Gold
|
2.24 g/t
|
0.31 M oz
|
|
Proven & Probable
|
5 Mt
|
Gold
|
2.21 g/t
|
0.36 M oz
|
|
Measured
|
1.6 Mt
|
Gold
|
3.21 g/t
|
0.18 M oz
|
|
Indicated
|
16.2 Mt
|
Gold
|
3.21 g/t
|
1.8 M oz
|
|
Inferred
|
4.9 Mt
|
Gold
|
1.7 g/t
|
0.28 M oz
|
Heavy Mobile Equipment as of December 31, 2020:
| HME Type | Size | Quantity |
|
Shovel (hydraulic)
|
|
2
|
|
Truck (haul)
|
240 tons
|
12
|
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