The Colomac Mine was an open pit gold mine in the Northwest Territories that operated between 1990-1992, and 1994-1997. It was operated by Peggy Witte, whose first company Neptune Resources Limited had little success in making a profitable operation. In 1994 the mine reopened by her other company, Royal Oak Mines Incorporated. Low gold prices forced Royal Oak into bankruptcy and the mine was reverted to the federal government of Canada. A major cleanup effort is underway to prevent the mine from polluting the environment.
The Colomac Mine processed a total of 12,294,352 tons of ore to produce 535,708 ounces of gold.