The Enigma stibnite vein is exposed in a trench on the south shore of Carpenter Lake, about 8.5 kilometres east of Gold Bridge. The vein is within brecciated ribbon chert of the Permian to Middle Jurassic Bridge River Complex. The vein is composed of quartz and orange-brown calcite, with up to 70 percent of the vein occupied by bladed to massive stibnite, with small amounts of interstitial arsenopyrite. Minor fine-grained pyrite is present along vein margins. Both quartz and calcite are vuggy. Vein margins are sharp but not foliated. Red staining on vein material is probably kermesite (after stibnite). The Enigma vein is similar to veins of the Congress deposit (092JNE029).