CRITICAL MINERAL COMPANIES · RESEARCH
Montana critical mineral companies & projects
Research 11 documented projects and facilities in Montana, United States. Explore mineral exposure, source-reported activity, operators and company connections.
Asset counts by province / state · select a region
Canada’s mapped coordinates come from NRCan’s 2025 inventory. U.S. assets are mapped by state using USGS’s June 2026 release. Asset counts describe directory coverage.
MINERAL EXPOSURE
Montana at a glance
SUPPLY-CHAIN ACTIVITIES
Where assets fit
One asset can report several minerals. An organization may participate in multiple assets. Activity grouping describes the source record, and does not confirm current production, commercial availability or investment readiness.
THE ASSET INVENTORY
Projects, mines & facilities
| Project / facility | Minerals | Region | Source classification |
|---|---|---|---|
| Alder Mountain Mine ↗Endomines Finland Oyj | Silver | MontanaUnited States | Mines and QuarriesIn development · 2026-06-29 |
| Black Butte Mine ↗Sandfire Resources Ltd. | Copper | MontanaUnited States | Mines and QuarriesIn development · 2026-06-29 |
| Butte Plant ↗REC Silicon | Silicon | MontanaUnited States | Mineral Processing PlantAssumed active · 2026-06-29 |
| Columbus Metallurgical Refinery ↗Sibanye Stillwater Ltd. | Copper · Nickel · Platinum group metals · Selenium | MontanaUnited States | RefineryAssumed active · 2026-06-29 |
| Columbus Metallurgical Smelter ↗Sibanye Stillwater Ltd. | Copper · Nickel · Platinum group metals · Selenium | MontanaUnited States | SmelterAssumed active · 2026-06-29 |
| Continental Mine ↗Montana Resources LLP | Copper · Molybdenum · Silver | MontanaUnited States | MineAssumed active · 2026-06-29 |
| East Boulder Mine ↗Sibanye Stillwater Ltd. | Copper · Nickel · Platinum group metals · Selenium | MontanaUnited States | MineAssumed active · 2026-06-29 |
| Montana Tunnels ↗Montana Goldfields, Inc. | Lead · Silver · Zinc | MontanaUnited States | MineIn development · 2026-06-29 |
| Stillwater Mine ↗Sibanye Stillwater Ltd. | Copper · Nickel · Platinum group metals · Selenium | MontanaUnited States | MineAssumed active · 2026-06-29 |
| Stillwater West ↗Stillwater Critical Minerals | Nickel · Copper · Cobalt · Platinum group metals | MontanaUnited States | ExplorationSee company disclosures · 2026-09-10 |
| Thompson Falls Smelter ↗United States Antimony Corporation | Antimony · Silver | MontanaUnited States | Refinery / SmelterAssumed active · 2026-06-29 |
CORPORATE FOOTPRINT
Companies & operators
Endomines Finland Oyj ↗
Silver
Hanwha Group ↗
Silicon
Montana Goldfields, Inc. ↗
Lead · Silver · Zinc
Montana Resources ↗
Copper · Molybdenum · Silver
Montana Resources LLP ↗
Copper · Molybdenum · Silver
REC Silicon ↗
Silicon
Sandfire Resources Ltd. ↗
Copper
Sibanye Stillwater Ltd. ↗
Copper · Nickel · Platinum group metals · Selenium · Silver
Stillwater Critical Minerals ↗
Cobalt · Copper · Nickel · Platinum group metals
The Washington Companies ↗
Copper · Molybdenum · Silver
United States Antimony Corporation ↗
Antimony · Silver
CONTINUE YOUR RESEARCH
Mineral sectors in Montana
Research sources
- U.S. Geological Survey — U.S. facilities, June 2026 ↗Inventory: 2026-06-29 · Checked 2026-09-10
- Stillwater Critical Minerals — official company information ↗Checked 2026-09-10
- Stillwater Critical Minerals — project information ↗Checked 2026-09-10
- Stillwater Critical Minerals — official company information ↗Checked 2026-09-10
- Stillwater Critical Minerals — official company information ↗Checked 2026-09-10
Each asset profile includes its source references and dates. Read the coverage, data licences and review methodology ↗.