The Mo 1-83 occurrence consists of base metal mineralization in plutonic rocks, 4.8 kilometres southwest of the southern end of Middle Lake, 40 kilometres southwest of the community of Tatla Lake. Only limited information is available, and its location is very approximate (Geology, Exploration and Mining in British Columbia 1972).

The area lies within a large composite intrusion, the Klinaklini pluton, of the Jurassic to Tertiary Coast Plutonic Complex (Geological Survey of Canada Open File 1163). The main granodiorite pluton has been assigned to the Late Cretaceous to Paleocene Bendor suite. Small granodiorite stocks that underlie the VB (092N 013), A & E (092N 032), and PW (092N 042), prospects to the west are assigned to the Eocene Mission Ridge suite.

This consists locally of quartz diorite and diorite, which are intruded by a quartz monzonite stock and a large number and variety of felsite dikes. Older, volcanic rocks including andesite, basalt and tuff, form roof pendants in the intrusions.

The mineralization is apparently associated with the quartz monzonite stock. Pyrite, chalcopyrite, molybdenite, galena, sphalerite, molybdite, malachite and azurite have been found.