The Marmot Metals occurrence is located just west of the Marmot Glacier, 12.0 kilometres southeast of Stewart.

The showing consists of silicified zones containing stringers and disseminations of pyrite, sphalerite and minor galena and pyrrhotite. The zones occur in a limestone bed of the Lower Jurassic Unuk River Formation (Hazelton Group). The limestone unit has been segmented into four blocks, each roughly 100 metres wide, by three north trending steeply dipping faults. The zones are confined largely to the westernmost block.

A 2 to 8 metre wide zone strikes northwest for 125 metres and occurs within 30 metres of the eastern edge of this limestone block. The average assay from eighteen chip samples across the zone was 0.06 gram per tonne gold, 23.91 grams per tonne silver and 2.60 per cent zinc (Assessment Report 11943, page 16, Map 2). Various other silicified zones, not as extensive and up to 4.0 metres wide, also occur in the westernmost limestone block.

The property was worked from 1913 to 1927 during which time numerous tunnels and opencuts were made. The Montana tunnel at 716 metres elevation, west of Montana Creek, was driven below a quartz vein containing galena, sphalerite and pyrite. The workings include an 18-metre tunnel, 15 metres of drifting and a 9 by 6 metre shaft. On the east end of the Horseshoe claim (Lot 4975) at 899 metres elevation, a showing of quartz mineralized with pyrrhotite, chalcopyrite and galena gave values up to $20/ton in gold (ca. 1925). The Canyon tunnel southeast of the Montana tunnel was driven 35 metres following a vein outcropping in Montana Creek; no significant mineralization was encountered. At 975 metres elevation west of Montana Creek, a tunnel was driven 55 metres following a mineralized andesite dike contact. Mineralization 10-30 cetimetres wide for the first 7.6 metres from the portal consists of massive galena and sphalerite. A second 4.5-metre lens was intersected 15 metres in from the portal. Numerous cuts and a 9-metre tunnel were made in the second limestone block from the summit. A 15-metre tunnel below the northern limestone-greenstone contact intersected a 3.6-metre lens of sphalerite. Since 1927, the property has seen little or no work except for geological mapping by U & D Kretschmar in 1980. In 1983, mapping and prospecting was conducted by Esso Resources Canada Limited.

Granby Gold Inc.'s Marmot property, containing the Marmot Metals showing, underwent geological mapping throughout 2013 to 2015. In 2017 the geology was finer tuned by interpretation with regional airborne geophysics and again in 2018 with airborne geophysical survey data. There is no strong geophysical expression of the Marmot Metals prospect (Assessment Report 38124).