The Echo Bay Mines Limited company was organized in 1964 to develop a silver deposit at Great Bear Lake, Northwest Territories, which became known as the Echo Bay Mine. The company leased the old Port Radium settlement from Eldorado Mining and Refining Limited and used the old camp and mill to recover silver and copper values. Production in the Echo Bay workings ceased in 1975. The company then reopened the old Eldorado Mine workings and produced more silver and copper until 1982 when low silver prices closed the mine for good. Echo Bay Mines Limited was busy opening a new gold mine by that point - Lupin Mine, in the Northwest Territories. It entered production in 1982. Echo Bay Mines Limited developed numerous other properties mostly in the United States, including the McCoy, Round Mountain, and Kettle River Mines. Head office was in Nevada State.

The company became a subsiduary of Kinross Gold Corporation in 2003 and has been delisted from the stock exchange.