At the Last Chance showing, several shafts, tunnels and opencuts have been sunk and driven alongside the track of the Canadian Pacific Railway, near the western shore of Mara Lake about 21 kilometres north of the community of Enderby.

The hostrocks are described as the "lowest members" of the Shuswap Metamorphic Complex, comprising sediments and hornblende intrusive sills. There is a pronounced fracturing cutting the general northwesterly trend of the country rock, with a number of quartz veins and silicified seams. Some of these are reported to carry gold values (Minister of Mines Annual Report 1926, page A188).

Recent geology maps indicates the area is underlain by Proterozoic and/or Paleozoic Shuswap assemblage quartzofeldspathic gneiss, pelitic schist, calcsilicate gneiss and marble.