Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Production Start | ... |
Mine Life | 2039 |
Marigold is a large run-of-mine heap leach operation with several open pits, waste rock stockpiles, leach pads, a carbon absorption facility, and a carbon processing and gold refining facility.
Exploration at Marigold continues to focus on higher-grade oxides, resource expansion and reserve conversion. New Millennium & Buffalo Valley may host potential for longer- term stand-alone processing infrastructure, improving operating costs through shorter hauls. |
Source:
p. 55
Company | Interest | Ownership |
SSR Mining Inc.
|
100 %
|
Indirect
|
Marigold Mining Company
(operator)
|
100 %
|
Direct
|
SSR Mining, through its subsidiary Marigold Mining Company, is the operator of the Marigold Complex and holds a 100% interest in the property.
Contractors
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Deposit Type
- Carlin-type
- Sediment-hosted
- Vein / narrow vein
Summary:
Marigold is located in the Battle Mountain mining district of north-central Nevada within the Basin and Range physiographic province bounded by Sierra Nevada to the west and the Colorado Plateau to the east. The Battle Mountain district hosts numerous mineral occurrences, including porphyry copper–gold, porphyry copper–molybdenum, skarn, placer gold, distal disseminated silver-gold, and Carlin-type gold systems. The gold deposits at the Marigold Mine are best classified as Carlin-type gold deposits (CTGD). Gold mineralizing fluids were primarily controlled by fault structure and lithology, with tertiary influence by fold geometry. Gold occurs natively as submicron scale particles in fractures in association with iron oxide. Rocks within the Marigold mine area are oxidized to a maximum depth of approximately 450 meters. The Buffalo Valley gold deposit is a distal disseminated silver-gold deposit and formed along a southeast trending zone of felsic porphyry dikes and faults.
Marigold
The gold deposits at Marigold are considered Carlin-type and cumulatively define a north-trending alignment of gold mineralized rock more than eight kilometres long. Gold mineralizing fluids were primarily controlled by fault structure and lithology, with tertiary influence by fold geometry. Within the Valmy Formation, higher gold grades are observed in the hinge zones of open folds that trend west–north-west and plunge gently. When viewed down plunge, the undulation of these folds ........
Summary:
Marigold uses standard open pit mining methods with a LOM sustained mining rate of approximately 260,000 tpd.
Loading operations are currently performed using one electric shovel and three hydraulic shovels. Waste and ore haulage is performed with a fleet of 280 t payload primary haul trucks. The mine conducts conventional drilling and blasting activities with a free face trim row blast to ensure stable wall rock conditions. Electronic detonators are used to control the timing of the blasthole detonation.
Drilling and blasting occur on benches with a height of 15.2 m. One grade control sample is taken from each blasthole with the sub-drilling excluded. Mining occurs on the full bench height (15.2 m) when pre-stripping waste or mining ore areas with the electric shovel. When using the smaller hydraulic shovels, mining is done on a bench height of 7.6 m to minimise the dilution that would otherwise occur from dozing a 15.2 m high face to these smaller shovels. Blasting is done with an ammonium nitrate and fuel oil (ANFO) blend and a sensitized ANFO emulsion. The ore control mark-out procedure includes blast movement analysis for 90% of ore production blasts.
The Marigold geotechnical management plan (GMP) includes highwall monitoring using three radar systems which provide full coverage for the Mackay pit, which is the largest pit, or which can be deployed in the smaller pits, if required. Routine monitoring of WRSA, leach pads, and inactive pit ........
Flow Sheet:
Summary:
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Source:
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Reserves at December 31, 2023:
Marigold Mineral Reserves are reported at a cut-off grade of 0.069 g/t payable gold (gold assay factored for metallurgical recovery, royalty, and net proceeds).
Marigold Mineral Resource estimate includes Marigold Mine and Buffalo Valley. Marigold Mine is based on an optimized pit shell at a cut-off grade of 0.069 g/t payable gold (gold assay factored for recovery, royalty, and net proceeds). Buffalo Valley cut-off grade is based on lithology type: calcsilicate hornfels of 0.279 g/t gold, greenstone of 0.184 g/t gold, intrusive of 0.134 g/t gold, and siliceous hornfels of 0.158 g/t gold (payable gold factored for recovery, royalty and net proceeds).
Category | OreType | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
Leach Pad
|
kt
|
Gold
|
|
282 koz
|
Probable
|
Stockpiles
|
18,600 kt
|
Gold
|
0.14 g/t
|
85 koz
|
Probable
|
In-Situ (OP)
|
150,700 kt
|
Gold
|
0.52 g/t
|
2,496 koz
|
Indicated
|
In-Situ (OP)
|
118,610 kt
|
Gold
|
0.46 g/t
|
1,740 koz
|
Inferred
|
In-Situ (OP)
|
27,360 kt
|
Gold
|
0.42 g/t
|
370 koz
|
Corporate Filings & Presentations:
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