Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
On July 1, 2019, Barrick’s Turquoise Ridge Mine and Newmont’s Twin Creeks Complex were combined as a single operation, now known as Turquoise Ridge.
Turquoise Ridge Surface is part of Turquoise Ridge Operation.
Turquoise Ridge Surface (Newmont’s former Twin Creeks property) was created in 1993 by the consolidation of the Rabbit Creek Mine and the Chimney Creek Mine. The former Rabbit Creek Mine is located in the south-end of the property, including what is now known as Mega Pit. The former Chimney Creek Mine included the northern portion of the Mega Pit, the Vista Pit, and Vista Underground, which is located in the north-end of the property near the Sage autoclave and Juniper oxide mill.
Turquoise Ridge Surface operates the Vista and Mega pits, as well as providing ore rehandle and surface project work at Turquoise Ridge Underground. |
Source:
p. 75-76,81
The Nevada Gold Mines joint venture was formed on July 1, 2019. Barrick's Turquoise Ridge and Newmont's Twin Creeks operation were contributed to the joint venture and are now collectively referred to as Turquoise Ridge.
Barrick is the operator of the joint venture and owns 61.5%, with Newmont owning the remaining 38.5% of the joint venture.
Contractors
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Deposit Type
- Sediment-hosted
- Carlin-type
Summary:
The Turquoise Ridge deposit is a typical Carlin-type deposit and is characterized by structurally and stratigraphically controlled, sediment-hosted, replacement deposits containing disseminated micron sized gold.
Turquoise Ridge Surface lies in an alluviated valley southeast of the Dry Hills, a northeastern outlier of the Osgood Range in northern Humboldt County, Nevada. The Dry Hills is an area of gently north-dipping Upper Paleozoic carbonate sediments, stratigraphically higher than rocks in the rest of the Osgood Range, which consists mainly of Lower Paleozoic elastic sediments intruded by a large Cretaceous pluton, which forms the backbone of the Osgood Range.
The deposit occurs within a north-south trending belt of gold mineralization that is at least 5.6 Km long and 300-450 m wide. The deposit is concealed under coalescing alluvial material consisting of three lithologic units. The lower unit is thin and discontinuous, composed of gravel containing chert, siltstone, shale and altered basalt. The middle unit is the most voluminous and composed of limestone gravel. The upper unit is fluvially reworked, windblown loess up to 7 m thick. Total overburden thickness is 12-200 m over the mine area. (Bloomstein, 1991).
Mineralization at the Mega and Vista Pits are spatially related to north-south and northeast faults, their intersections and fault intersections with folded stratigraphy. All structures are considered potential conduits for gold ........
Summary:
Turquoise Ridge Surface (Newmont’s former Twin Creeks property) was created in 1993 by the consolidation of the Rabbit Creek Mine and the Chimney Creek Mine. The former Rabbit Creek Mine is located in the south-end of the property, including what is now known as Mega Pit. The former Chimney Creek Mine included the northern portion of the Mega Pit, the Vista Pit, and Vista Underground, which is located in the north-end of the property near the Sage autoclave and Juniper oxide mill.
Turquoise Ridge Surface uses conventional open pit mining methods including drilling, blasting, loading, and hauling.
Surface mining operations occur in two developed open pit areas: Vista Pit to the north and Mega Pit to the south. Vista Pit measures approximately 1.1 km north to south, 1.0 km east to west, and the current pit depth is over 213 m. Mining in 2019 occurred in Vista 8 (V8), which will continue to deepen the pit by another 91 m in the ultimate design. Mega Pit measures 4.0 km overall north to south, and approximately 1.6 km east to west. The current pit depth is over 365 m and will deepen by approximately 48 m in the ultimate design.
Source:
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Flow Sheet:
Summary:
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Reserves at December 31, 2021:
| Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
Total
|
29 Mt
|
Gold
|
2.13 g/t
|
1.95 M oz
|
|
Probable
|
Total
|
13.5 Mt
|
Gold
|
1.9 g/t
|
0.83 M oz
|
|
Proven & Probable
|
Total
|
42 Mt
|
Gold
|
2.05 g/t
|
2.76 M oz
|
|
Measured
|
Total
|
41 Mt
|
Gold
|
2.12 g/t
|
2.76 M oz
|
|
Indicated
|
Total
|
37 Mt
|
Gold
|
2 g/t
|
2.44 M oz
|
|
Inferred
|
Total
|
16 Mt
|
Gold
|
1.8 g/t
|
0.98 M oz
|
Commodity Production Costs:
| | Commodity | Units | 2018 | 2017 | 2016 |
|
Total cash costs (sold)
|
Gold
|
USD
|
668 / oz†
|
611 / oz†
|
514 / oz†
|
|
All-in sustaining costs (sold)
|
Gold
|
USD
|
820 / oz†
|
756 / oz†
|
613 / oz†
|
† Net of By-Product.
Operating Costs:
| | Units | 2021 | 2020 |
|
OP mining costs ($/t mined)
|
USD
| 3.5 | 2.5 |
Financials:
| | Units | 2018 | 2017 | 2016 |
|
Capital expenditures
|
M USD
|
82
|
52
|
37
|
|
Pre-tax Income
|
M USD
|
-146
|
163
|
266
|
Corporate Filings & Presentations:
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