TROY, Mont. — A massive reclamation project is underway at the site of the former Troy Mine in northwestern Montana.

The Flathead Beacon reports ( the cleanup of the former silver and copper mine is expected to take about three years.

The remediation includes covering 303 acres of tailings with topsoil, demolishing buildings and filling in mine portals.

Doug Stiles of Hecla Montana says when the project is complete, it will be hard to tell that a mine ever existed.

The Troy Mine opened in 1981 and shut down in 1993. It reopened in 2005, and closed permanently after Hecla bought the mine’s owner, Revett Mining Company, in 2015.

The mine produced 84 million ounces of silver and 430 pounds of copper.

Information from: Daily Inter Lake,