The Soho occurrence is located at 2042 metres on a sharp ridge separating the headwaters of Rambler Creek from McGuigan Creek. Kaslo, British Columbia is located roughly 28 kilometres to the east-southeast. The main workings are on the Old Tom Moore claim at about 2072 metres elevation. The Soho claim is located roughly 610 metres north of the Old Tom Moore claim at 2042 metres elevation.
Development began in 1893 with work on the Tom Moore and St. Lawrence claims, by M.C. Monaghan, G. Hamley and T. Hennessy. The ground was then later re-staked as the Soho and Old Tom Moore claims. Early work on the Soho claim consisted of two inclined shafts 18 metres apart and totalling 40 metres. Drifts were run east and west off the deeper shaft for 37 metres. A shipment of ore was claimed to have been made in 1901 from the Soho claim. Several adits were developed on the Old Tom Moore claim. By 1913, the Soho Group consisted of eight Crown grants and the Soho Mines Limited was incorporated. Development work was carried out from 1915 to 1917. In the following years intermittent work was carried out by lessees. The company was reorganized as the Soho Consolidated Mines Limited in 1923 with activity reported in early 1924. By 1926, the Mary Ryan Mines Limited acquired the Soho Group. More development work was carried out from 1927 to 1929 on the Old Tom Moore adits. Workings now consisted of 4 adits on the western side of the ridge and an intermediate level, the No. 4 level, with its portal on the eastern side of the ridge. Level No. 5 was a crosscut driven 61 metres to the Old Tom Moore vein. Drifts were driven east and west along the vein. The Mary Ryan vein was developed by two adits, 14 vertical metres apart. The company folded in 1942 and the property was acquired at a tax sale by J.R. Cassin. Property activity lapsed until 1962 when L.N. Garland and associates took an option on the property, as well as acquiring the adjacent Antoine occurrence (082KSW011). From 1966 to 1967, the Old Tom Moore No. 5 level was extended to reach the Antoine lode. All operations ceased in 1968.
The Soho occurrence is underlain by a belt of thinly bedded argillaceous rocks of the Triassic Slocan Group. This belt is flanked by more massive, blocky and banded phyllite, argillites, quartzite and narrow limestone beds of the Slocan Group. The rocks trend northwest and dip moderately to steeply southwest. They are intruded by numerous quartz porphyry dikes and sills. Some basic dikes are also present.
Three roughly parallel lodes, trending northeast and dipping southeasterly, are mineralized with galena, sphalerite, pyrite, and minor tetrahedrite and pyrargyrite. Gangue minerals are quartz, siderite and those associated with sheared and brecciated hostrock.
The largest vein, referred to as the Tom Moore, strikes 050 to 055 degrees and dips about 60 to 70 degrees southeast, but in places is near vertical. The vein ranges from several metres to a few centimetres wide over a vertical depth of 100 metres. It has been developed by mine workings for roughly 200 metres length. Most of the ore has been mined from a number of stopes, from 18 metres length and 12 metres depth, above the No. 4 level. These stopes occupy a central position under the summit ridge. Below the No. 4 level, the lode tightens following a fracture with no more than 8 to 10 centimetres width of mineralized vein. A sample assayed 2386 grams per tonne silver, 46.4 per cent lead and 24.5 per cent zinc (Minister of Mines Annual Report 1923). The ore was principally galena and sphalerite hosted in siderite, quartz and brecciated hostrock.
The Ryan vein, about 130 metres northwest of the Tom Moore, strikes about 045 degrees and dips about 37 degrees southeast. The lode is not well defined except in the vicinity of a winze, sunk 18 metres below the lower level. Mineralization consisted of galena, sphalerite, pyrite and minor tetrahedrite and pyrargyrite in a quartz gangue.
The Soho vein is 1000 metres northwest and 300 metres vertically below the outcrop of the Tom Moore. It strikes about 055 degrees and dips steeply southeast. Ore specimens contained galena and sphalerite in a gangue of siderite, quartz and brecciated hostrock.
Production from the former Soho mine occurred primarily near the turn of the century. Total recorded production amounted to 815 tonnes with 2,483,427 grams silver, 67,584 kilograms lead and 2,584 kilograms zinc recovered.
