The Mara Copper showing is located near the fault contact between the Proterozoic and/or Paleozoic Shuswap assemblage and the lower Paleozoic Tsalkom Formation (Mount Ida Group). Several quartz veins appear to cut argillite and slate of the Tsalkom Formation with Shuswap assemblage gneiss outcrops nearby. A trace of copper has been reported (chalcopyrite is the inferred mineralization).