Situated in and around Timmins City, the Porcupine district has yielded over 68 million ounces since 1910. Presently, approximately 60 percent of the gold is extracted from the Hoyle Pond underground mine, using mechanized cut and fill and long hole mining techniques, while the rest of the ore is sourced from the Hollinger Open Pit mine. The Dome Underground mine ceased its operations in 2017. Ore undergoes processing at the Dome processing facility through a series of stages including crushing, grinding, gravity concentration, cyanide leaching, carbon in pulp recovery, stripping, electrowinning, and refining.