The Clinton Manganese #3 occurrence is located approximately 6.4 kilometres southeast of Clinton on the southeast side near the summit of Hart Ridge (Dolmage, 1944).

GSC Map 1278A (Memoir 363) shows the area to be underlain by basic volcanic flows, tuff, ribbon chert, limestone and argillite of the Permian to Triassic Cache Creek Complex.

Dolmage (1944) states that the deposit is hosted in "cherty quartzite" (chert ?) interbedded with thin layers of argillaceous material. The manganese minerals are black to steel grey, hard and crystalline, occuring as streaks and thin lenses to 1 centimetre in thickness parallel to bedding and also as fracture fillings up to 1 centimetre in thickness. Three outcrops expose the showings along a trend of 320 degrees over a strike length of 55 metres. A sample taken over a width of 1.07 metres assayed 22.8% manganese.