The Home Rule showing outcrops along the east side of the Similkameen River, 11 to 12 kilometres south-southwest of Princeton.
This showing occurs in the Early Jurassic Smelter Lake stock (Copper Mountain Intrusions), near its southwestern margin.
Mineralization consists of chalcopyrite and bornite in porphyritic diorite. Samples are reported to assay 5 to 10 per cent copper and 3.3 grams per tonne gold (Minister of Mines Annual Report 1899, page 741).
The showing was explored with a series of trenches and shafts by Vermillion Forks Mining and Development Company Ltd. between 1899 and 1908.