The ROSEMONT mine is located north of St. John Creek, approximately 9.5 kilometres northeast of Carmi.
The property occurs at a contact zone between metasediments of the Carboniferous-Permian Anarchist Group and quartz diorite of an unnamed Middle Jurassic Intrusion. This intrusion was previously mapped as Middle Jurassic Nelson Intrusions (Geological Survey of Canada Map 1736A). Contact metamorphism of the sediments and assimilation of country rock by the intrusives is common. Narrow contact zones are mineralized with 1 to 3 per cent pyrite and pyrrhotite.
In the ROSEMONT mine mineralization occurs in quartz as mesothermal fracture fillings at the Anarchist-intrusive contact zone. Pyrite and pyrrhotite blebs and aggregates are found in the 2 to 40 centimetre thick quartz veins which cut irregularly through small shear zones and the contact fracture zone. Gold is associated with pyrite and chalcopyrite is reported.
This area was an active exploration camp at the turn of the century when the Highland Bell (082ESW030) silver mine was discovered. Early references to this general area are to the KNOB HILL (082ENW047) occurrence where a 12-metre shaft was sunk in an "iron cap" in 1901. Another occurrence, the IVY (082ENW037), is located 3 kilometres to the southwest.
The ROSEMONT mine began production in 1937 and by the time it closed in 1941, it had produced 107 tonnes of gold-silver ore from which were recovered 1462 grams of gold and 1928 grams of silver. Highland Bell, who operated the mine in 1940-41, carried out about 25 metres of drifting and 30 metres of crosscutting during this period, extending the total length of underground workings to approximately 122 metres.
In 1973, Austro-Can Exploration Limited had a VLF-EM geophysical survey carried out over the area which identified anomalies in the vicinity of the old workings. In 1974, prospector H.O. Plank drilled 2 diamond-drill holes for a total of 26 metres. No assays were recorded. Bulldozer trenching predates the above programs and is thought to have been carried out in the 1960s. In 1981, Cominco staked the property and carried out a soil geochemical survey. Samples were analysed for gold, silver, copper, lead and zinc. The results were discouraging and the property was dropped.
In 1984, M.S. Morrison carried out a VLF-EM survey. Three strong northwesterly trending anomalies were discovered. The claims were allowed to lapse, but were re-staked in 1985-86. In 1986, a biogeochemical survey was carried out by Morrison which identified anomalous zones of silver, arsenic, iron, lead, and zinc coincident with the ROSEMONT workings and extending to the northwest. The property was optioned by Zygote Resources Ltd. in 1987. They funded geological mapping, VLF-EM and magnetometer surveys and biogeochemical surveys. Although anomalous zones were identified, the property was allowed to lapse. It was re-staked in 1989 by Morrison who carried out another biogeochemical survey in 1990. A cadmium anomaly was discovered which coincides with previously identified VLF-EM anomalies. Richard H. Lonsdale acquired the Rosemont Crown Grant in 1993 and conducted sampling.