The Pem showing, discovered in 1980 during work following a regional geochemical survey, occurs within the town of Pemberton adjacent to the town's rifle range and a recent housing subdivision along the Lillooet River. The area is underlain by hornblende granodiorite, quartz diorite and diorite of the Jurassic to Tertiary Coast Plutonic Complex. A shear zone cutting the intrusive rocks has been silicified and mineralized.

Sulphide mineralization within the shear zone consists mainly of pyrite with some chalcopyrite and galena and minor molybdenite and hematite.