The Triumph Mine is located between Hailey and Ketchum. It operated as late as the 1950s. Many artifacts from the mine are clearly visible as you drive down East Fork Road. The mine is a bit of a natural disaster as it still continues to leak heavy metals into the ground water.
When traveling north from Hailey on highway 75, true right on East Fork Road. Drive down the road until you reach Triumph. You will see the mine up and to the left.