Butte, Montana: steel headframes standing over the town with the terraced Berkeley Pit behind
A worker in a hard hat climbing an external stair towards a large storage tank at a processing plant, the sun flaring through the steelwork

The directory

246 American operations, working and lost

Every mine, mill, smelter, refinery and separation plant below is a real, sourced operation on US soil — 154 of them still working, and 92 that have closed, been idled or been reclaimed. Filter by what you need, then follow the source links. Status is stated exactly: a project in permitting is not a producing mine, and a mine on care and maintenance is not a dead one.

Headframes over Butte, Montana

Climbing to the tanks at a plant

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