The Commodore Waste Rock Dump resulted from various mining operations in and around the Commodore Mine between 1890 and 1960. The unsecured waste rock pile consists mostly of barren and mineralized rock produced during development of the mine adit, the Nelson Tunnel. The major contributor of toxic heavy metals to the down-gradient Willow Creek drainage is discharge water from the Nelson Tunnel adit which is located adjacent to the toe of the pile. surface and subsurface drainage from the pile’s mineralized rock is the second major contributor. Actions will be taken to stabelize the pile.