The Comstock occurrence is located at about 2103 metres elevation on the divide between Fennell and Silverton creeks. Silverton, British Columbia is located 11.5 kilometres to the northwest. The Comstock Group historically consisted of seven claims including the Ruby Trust (Lot 1804), Silver Chief (Lot 1813) (forfeited to the Crown February 9, 1993) and Comstock (Lot 1814) (forfeited to the Crown February 9, 1993), Silver Cup (Lot 1815), Isabel Fraction (Lot 1817) and Kentucky Girl (Lot 1818).
The earliest recorded work was in 1898 and continued intermittently until 1920. Early workings consisted of nine adits totalling 853 metres length. A mill was erected in 1897 to treat Comstock ore but was only used for two months. No further work was recorded until 1970. Work in 1970 was conducted by R.H. Murphy and partners and included a small shipment of dump material to the Trail smelter. Further work was done in 1972 and 1973. In 1976, H.S. Murphy and R.H. Murphy conducted a geochemical survey, trenching and one 25-metre drillhole. In 1988, Dragoon Resources Ltd. custom smelted ore in a mill in Ainsworth.
The area is dominated by granitic rocks of the Middle Jurassic Nelson intrusions. At the Comstock occurrence these consist of biotite lamprophyre and quartz monzonite.
At the Comstock mine, mineralized quartz veins occur predominantly along the contact of a biotite lamprophyre body and quartz monzonite, both of the Nelson intrusions. The quartz monzonite is fine to medium grained, massive and fresh. The biotite lamprophyre is dark grey to black, medium grained with local coarse biotite crystals; magnetite is common. Monzonite blocks occur within the lamprophyre body.
Quartz veining and related mineralization is hosted in a brecciated zone 5 centimetres to 2 metres wide, striking 035 to 055 degrees and dipping 35 to 55 degrees southeast. Mineralization consists of galena, sphalerite, minor tetrahedrite and trace pyrargyrite. Gouge is evident on both the hangingwall and footwall of the zone which also contains crushed quartz monzonite and lamprophyre fragments. The zone has been traced over a strike length of approximately 2100 metres between the 1670 and 2040 metre elevations (Assessment Report 17821).
Intense iron carbonate alteration, limonitic fractures and minor quartz-carbonate veining occur adjacent to the main mineralized zone. Several east striking lamprophyre dikes and quartz veins intersect the main zone.
Measured geological (proven) reserves at the Comstock-Silver Cup property is 45,355 tonnes grading 1199.8 grams per tonne silver, 6 per cent lead and 10 per cent zinc (Western Investment News - May 1987).
The Comstock mine was developed by nine adits. Stoping was carried out between the second and third levels and between the fifth and seventh levels, for a strike length of 15 metres and 109 metres respectively. The underground workings have explored the mineralized zone over a vertical distance of 121 metres.
Production records indicate 455 tonnes of ore mined. From this, 1,687,774 grams silver, 12,387 grams gold, 217,634 kilograms lead and 126,657 kilograms zinc were recovered.
