Copperopolis was a mining community situated in Meagher County, Montana, United States.

In 1866 copper veins were discovered in the area north of the Castle Mountains and started attracting attention as a mining center.

The deepest shafts ran to 550 feet although much of the ore was recovered close to the grass roots.

During the first nine months of operation a quarter of a million dollars was uncovered from the mines.

In 1901 copper export prices were cut in half due to the depression in Germany.