The Montreal No. 4 showing is located about 16.5 kilometres east-northeast of Stewart, on the south side of Hartley Gulch near the headwaters of the creek that drains the west side of Otter Mountain.
The area is underlain by a belt, 1000 metres wide, of north striking, east dipping sedimentary and tuffaceous rocks of the Lower Jurassic Unuk River Formation (Hazelton Group). These rocks comprise a sequence of argillites and quartzites overlain by andesitic volcanic breccias, calcareous tuffs, tuffaceous limestones and a capping of lavas. The belt is flanked on the east and west by intrusive augite porphyry. On the west side, the augite porphyry forms a 500 metre wide sill-like body; on the east side the porphyry may form a local stock. The supracrustals may form a roof pendant in the porphyry (Property File - Mandy, 1936). Felsic and mafic dikes intrude both the supracrustals and the porphyry.
Mineralization is formed by seven generally parallel, east trending, vertical, narrow, shear-hosted quartz-calcite-ankerite veins. The veins are 5 to 25 centimetres wide and can be traced for up to 50 metres in length. The Nos. 1 to 5 veins occur over a width of 30 metres and are about 10 metres apart. The Nos. 6 and 7 veins, about 15 metres apart, are located about 300 metres south of the centre of the above vein swarm. The veins are hosted mainly in dark calcareous tuff and tuffaceous rocks, but at least three of the veins (Nos. 2, 3 and 4) also cut the augite porphyry intrusion at their eastern(?) ends. The better grade mineralization in the veins occurs in the intrusion, near the contact with the supracrustals. The veins contain disseminations, blebs and pods of pyrite, sphalerite, galena, chalcopyrite and tetrahedrite.
A grab sample collected in 1936 from sacked ore from the No. 3 vein assayed 24,000 grams per tonne silver, 2.1 grams per tonne gold, 4.5 per cent antimony, 23.0 per cent zinc, 18.0 per cent lead and 7.0 per cent copper (Property File - Mandy, 1936).
In 1990 and 1991, the showing (No. 1 or Main) was described and investigated, but no workings were located. The Main showing consists of east-trending shears hosting milky quartz, less carbonate and wallrock inclusions. Mineralization consists of local masses and disseminations of sphalerite, argentiferous galena, chalcopyrite and tetrahedrite. The zone, up to 95 metres wide and 75 metres long, is characterized by carbonate alteration of the hostrock. Thirteen surface samples averaged 0.35 gram per tonne gold and 225.0 grams per tonne silver (Assessment Report 21975).
Several similar occurrences have been documented on the Pam claims, which are part of the Otter Mountain or Kai property, to the south in the 103P mapsheet.
The showings were originally covered by the Parvati 1-8 claims, staked by Rolston and associates in 1934. By 1936, two opencuts had been emplaced on two of the exposed veins (Nos. 3 and 7) and 15 sacks of high-grade ore were shipped from these veins (Property File - Mandy, 1936). The claims subsequently lapsed. In 1944, the Montreal claim group was staked over the area; these eight claims may have been a restaking of the Parvati claims. During 1944-46, some opencutting was conducted and in 1949 the claims were surveyed. In 1965, Hepson and Fegan shipped about 2182 kilograms of selected material to Trail (Assessment Report 19398). Mineral Policy does not have any production recorded for this property; it is likely included with some other property because they were all shipping to the same smelter. In 1979, Harkley Silver Mines Ltd. acquired the claims and carried out intermittent exploration during 1979-89. The latter work included prospecting, drilling and a geochemical soil survey. In 1989, Bond Gold Canada Inc. optioned the property (called the Kai property) and conducted mapping and sampling in 1991.
