A bubbling spring is located in Mara Lake, just south of Black Point, and has been active since early Indian times. The gas that issues from this spring is largely carbon dioxide. Rumour states that a company intends to capture the gas, compress it, and market it for industrial use (GSC Memoir 296, page 162).

Recent geology maps indicates the area is underlain by gneiss and schist of the Proterozoic and/or Paleozoic Shuswap assemblage.