Overview
| Stage | Production |
| Mine Type | Stockpile |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
Turquoise Ridge Surface is part of Turquoise Ridge Operation.
Turquoise Ridge Surface (the former Twin Creeks property) was formed in 1993 by the consolidation of the Rabbit Creek Mine and the Chimney Creek Mine.
Turquoise Ridge Surface has currently paused mining in the open pits, while ore from stockpiles is processed. Mining from the open pits is expected to resume in the medium to long-term and continue until 2034 at approximately 57,000 tonnes mined per day. |
Source:
p. 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
- Subscription is required.
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.
Mineralization at Turquoise Ridge Surface is localized in decalcified carbonates, but can occur less frequently in argillized and sulphidized basalt. Silicification is common in Comus Formation sediments immediately adjacent to basaltic contacts with generally lower gold grades.
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 ........
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 operates the Vista and Mega open pits, as well as providing ore rehandle and surface project work at Turquoise Ridge Underground. Turquoise Ridge Surface uses conventional open pit mining methods including drilling, blasting, loading, and hauling.
Open pit mining was largely completed in the fourth quarter of 2021, which was the source of lower grade heap leach material.
In the fourth quarter of 2022, the plant processed more material than mined during the current period by drawing upon long-term open pit stockpiles from the Vista and Mega pits. Most of this stockpile was established prior to the formation of Nevada Gold Mines.
Source:
- subscription is required.
Flow Sheet:
Summary:
- subscription is required.
Reserves at December 31, 2022:
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Proven
|
16.3 Mt
|
Gold
|
2.29 g/t
|
1.22 M oz
|
|
Probable
|
0.46 Mt
|
Gold
|
1.38 g/t
|
0.03 M oz
|
|
Proven & Probable
|
17.8 Mt
|
Gold
|
2.27 g/t
|
1.25 M oz
|
|
Measured
|
39 Mt
|
Gold
|
2.14 g/t
|
2.6 M oz
|
|
Indicated
|
34.1 Mt
|
Gold
|
2.07 g/t
|
2.3 M oz
|
|
Inferred
|
10.9 Mt
|
Gold
|
1.7 g/t
|
0.6 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:
- Subscription is required.
- Subscription is required.