The Mara 1 showing is located near the fault contact between the Proterozoic and/or Paleozoic Shuswap assemblage and the lower Paleozoic Tsalkom Formation (Mount Ida Group). A zone, 1.8 to 2.4 metres thick, of parallel, bedded quartz-carbonate-pyrite veins occur in silicified and carbonatized argillite of the Tsalkom Formation. A shear is evident in the vein zone. The country rock strikes 320 degrees and dips 20 to 25 degrees southwest. The main zinc showing is on the south side of the south fork of Ptarmigan Creek.