The Gem Hunter occurrence is located at an elevation of approximately 1300 metres on a south-facing slope, north of Hellroaring Creek and approximately 2.3 kilometres south of St. Mary Lake.

Regionally, the area is underlain by quartzite and argillite of the Creston Formation and argillite, quartzite and mica schist of the Aldridge Formation, both of the Helikian Purcell Supergroup. These metasediments are intruded by sills and dikes of granodiorite of the Proterozoic Moyie Intrusions, which are in turn intruded by pegmatite of the Middle Proterozoic Hellroaring Creek stock. The east-trending St. Mary fault separates this area from the area underlain by Creston Formation metasediments to the south. The Aldridge Formation is folded into an open northwest-plunging anticline with the Hellroaring Creek stock emplaced in the core. For further information on the Middle Proterozoic Hellroaring Creek stock see the Hellroaring Creek (MINFILE 082FNE110) occurrence.

Locally, a quartz vein with limonite after pyrite in a gabbro hosts tungsten values. In the same area as the quartz vein, areas of pegmatite subcrop hosting beryllium and tin values have also been identified. White beryl crystals up to a few centimetres long are also reported.

In 2023, a rock sample (GH-23-03) from the quartz vein assayed 0.296 per cent tungsten, and samples of pegmatite yielded anomalous values of up to 0.023 per cent beryllium, 0.004 per cent lithium, 0.003 per cent tantalum, 0.008 per cent niobium, 0.106 per cent rubidium and 0.004 per cent tin (Assessment Report 41612).

In 2024, a rock sample (JKGHR007) of feldspar-quartz-muscovite pegmatite, taken approximately 500 metres up slope to the north of the tungsten-bearing quartz vein, yielded 0.862 per cent tin, 0.014 per cent beryllium, 0.066 per cent rubidium and 0.017 per cent tantalum, and other samples (THGHR010 and THGHR007) of pegmatite taken several hundred metres to the west assayed 0.041 and 0.063 per cent beryllium, respectively (Assessment Report 42322). Also at this time, three samples (MHGHR001, MHGHR003 and THGHR013) of pegmatite, taken near the ridge line to the north, yielded values of up to 0.022 per cent beryllium, 0.027 per cent niobium, 0.218 per cent rubidium, 0.038 per cent tin and 0.010 per cent tungsten (Assessment Report 42322).

Work History

In 1971, Kerr Addison Mines Ltd. conducted a regional program of geological mapping and geochemical (soil and silt) sampling on the area as part of the Dewar Creek project.

In 1985, the area was prospected by Monalta Resources as the Mar claim. In 1991, Donald Jackson prospected the area as the Lucky Day 1-6 claims of the Heldon property. Also in 1991 and 1992, Minnova, in conjunction with Kokanee Explorations, completed a regional program of prospecting, geological mapping, geochemical (rock and soil) sampling and a 12.0 line-kilometre electromagnetic survey on the area as the Horn and Darlin claims.

In 2023 and 2024, programs of prospecting, geological mapping and geochemical (rock and soil) sampling were conducted by Giacomo Grassi on the area as the Gem Hunter claim.