Overview
| Status | Temporary Suspension |
| Mine Type | Underground |
| Commodities |
|
| Mining Method |
- Longwall
- Continuous
- Room-and-pillar
|
| Production Start | ...  |
In February 2023, a Montana federal district court judge halted the mining of federal coal at the Bull Mountains Mine No.1. This halt is pending a thorough analysis of the mine’s impacts on ranchers, vital water sources, and the surrounding environment. The decision will require the Office of Surface Mining (OSM) to prepare an Environmental Impact Statement (EIS) to determine whether the expansion meets legal requirements to proceed. |
Source:
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Signal Peak Energy, LLC owns and operates the Bull Mountains Mine No.1 underground coal mine.
Contractors
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Summary:
The overburden and the underburden of the Bull Mountains Mine consist of layers of rock including clinker, sandstone, silty sandstone, coal, siltstone, and claystone. Typically, these layers are thin and alternate between the various lithologies.
The seam being mined is the Mammoth coal seam, and the coal is sub-bituminous.
Mining Methods
- Longwall
- Continuous
- Room-and-pillar
Summary:
The vast majority of coal is mined using the longwall method; the remaining development coal is mined using the room-and-pillar method.
The mine operates a longwall and one continuous mining machine development section.
Source:
Summary:
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Production:
| Commodity | Units | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Coal (thermal)
|
tons
| ...... | ...... | ...... | ...... | 7,566,480 | 5,883,820 |
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Operational Metrics:
| Metrics | 2020 |
|
Raw coal annual capacity
| 10 M tons |
Reserves at October 1, 2020:
| Category | Tonnage | Commodity |
|
Proven & Probable
|
86.8 M tons
|
Coal (thermal)
|
| Type | Material | Diameter | Length | Description |
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