The historic Enterprise camp is located on Mineral Hill, approximately 5.5 kilometres south of the community of Stump Lake. The King William occurrence is located 900 metres south east of the Enterprise Mine (MINFILE 092ISE028) and a complete exploration history can be found there.
The camp is hosted within a north trending belt of Upper Triassic intermediate volcanics, volcaniclastics and sediments belonging to the Nicola Group. These greenstones consist of massive, chlorite-epidote altered andesite and basalt, augite porphyry, andesitic flow breccia and tuff, minor interbedded argillite, conglomerate and limestone. Attitudes of tuff horizons and sedimentary bedding suggest that a north plunging axis of a syncline passes through Mineral Hill. Both west and north- east of Stump Lake, the Nicola Group volcanics are intruded by Lower Jurassic granitic batholiths; scattered granodiorite outcrops have been mapped in the vicinity of the camp. Secondary to the north- northeast trending Quilchena and Stump Lake regional faults are numerous smaller faults which form a complex fracture pattern and appear to control alteration and mineralization. Andesitic rocks are bleached, pervasively silicified, pyritic and brecciated. Mineral- ization occurs in numerous quartz, and less commonly calcite veins which strike generally to the north and dip steeply eastward.
The King William vein has been developed by various workings and is exposed in the Enterprise mine (092ISE028) one kilometre to the northwest and in several stripped areas along strike between the two areas. The King William vein generally strikes north- northwest, dips 65 to 85 degrees to the east and is regarded as a branch of the Enterprise vein. The King William vein pinches and swells considerably and carries variable amounts of pyrite, chalcopyrite, galena and sphalerite. Diamond drilling revealed that the altered andesite hosts numerous quartz stringers on either side of the vein. Drill core samples assayed up to 1.64 grams per tonne gold and 55.82 grams per tonne silver with trace lead and zinc values (Assessment Report 5565).
Production from the Enterprise (MINFILE 092ISE028), King William, Tubal Cain (MINFILE 092ISE108) and Joshua (MINFILE 092ISE109) veins, from 1916 to 1944, totalled 70,390 tonnes with recovery grades of 3.4 grams per tonne gold, 101.9 grams per tonne silver, 0.026 per cent copper, 1.42 per cent lead and 0.24 per cent zinc (Assessment Report 31405).
In 1996, a 1.0 metre chip sample of the King William vein is reported to have assayed 28.3 grams per tonne gold, 2500 grams per tonne silver, 21 per cent lead, 0.15 per cent copper and greater than 0.4 per cent zinc (Assessment Report 24923; Gourlay, A.W. (2013-09-13): Independent Geological Report on the Mineral Hill Property).
