The Soul quarry is located approximately 1 km south of Rheinhart Lake, on the north side of a prominent knob. Access is from the Chemainus River road then north on the Rheinhart Lake main. A spur road turns southeast past the quarry at Rheinhart Lake.

The area is underlain by metasedimentary rocks of the Mississippian to Pennsylvannian Fourth Lake Formation (Buttle Group) and volcanic rocks of the Upper Devonian McLaughlin Ridge Formation (Sicker Group). These two formations were historically referred to as the Myra Formation and contained the "Sediment-Sill Unit" of the Sicker Group. The Sediment-Sill unit has been tentatively correlated with the Fourth Lake Formation and the "sills" have been mapped separately. The sills are believed to be coeval with the Karmutsen Formation basalts and are informally named Mount Hall gabbro. These rocks have been intruded by granitic rocks of the Early to Middle Jurassic Island Plutonic Suite.

The quarry was established to develop test blocks of jasper, "granite" [Gabbro?] and marble. Results of this work by Lake Cowichan Imperial Stone Ltd. are not published.