The Mabel-Paul Boy vein strikes east-west and dips approximately 65 degrees north, hosting pyrrhotite, pyrite, and chalcopyrite in a quartz-calcite gangue. The vein is hosted in the Early Jurassic Rossland monzonite which is comprised of a biotite-hornblende-augite monzonite stock that intrudes the Lower Jurassic Rossland Group (Elise Formation) siltstone, volcanics and augite porphyry sill. A Tertiary lamprophyre dyke, the Spokane dyke, dated at 47.2 to 49.3 million years, crosscuts the monzonite.

In 1967, Thorpe analyzed chalcopyrite from the Mabel property. He determined that the gold:silver ratio was approximately 1:2 (Thorpe, 1967, page 57).

The Mabel was part of the Centre Star group (082FSW094) and some production was reported in 1906 when 22.7 tonnes of ore were shipped (Minister of Mines Annual Report 1906, page 153).