The Mobile occurrence is located just west of the south fork of Glacier Creek, 5.5 kilometres northeast of Stewart. Several shipments of high-grade ore were made from this prospect between 1930 and 1949.

The occurrence is hosted in well-bedded argillite and siltstone of the Middle Jurassic Salmon River Formation (Hazelton Group). These are intruded to the east by a Tertiary(?) augite diorite stock (Coast Plutonic Complex). The underlying greenstone of the Lower Jurassic Unuk River Formation (Hazelton Group) outcrops to the west. These sediments strike 160 degrees and dip 50 degrees southwest.

The Mobile showing is comprised of a series of steeply dipping, north-northeast striking shear zones and quartz-breccia veins. These are up to 6.1 metres wide, extend for up to 580 metres in length and contain quartz-carbonate lenses, up to 0.6 metre wide. Mineralization consists of galena, sphalerite and pyrite with minor argentite, tetrahedrite, stibnite, proustite and rare native gold and silver. The mineralization occurs within the quartz-carbonate lenses and is disseminated discontinuously throughout the shear zones and breccia veins. A 0.91 metre chip sample across a shear zone assayed trace gold, 363 grams per tonne silver, trace lead and 4.2 per cent zinc (Minister of Mines Annual Report 1929, page 95). A selected grab sample assayed 1.37 grams per tonne gold, 3805 grams per tonne silver, 19 per cent lead and 12 per cent zinc (Minister of Mines Annual Report 1931, page 42).

Production for 1930 and 1949 totalled 12 tonnes with an average grade of 2.7 grams per tonne gold, 8247 grams per tonne silver, 8.0 per cent lead, 9.6 per cent zinc and 0.3 per cent copper.

In 1923, over 183 metres of crosscutting was completed. A top tunnel was driven 18 metres following a stringer of ore; two intermediate tunnels were driven below this. The lower tunnel was then driven 131 metres, following a well-defined vein from 0.6 to 1.2 metres wide, striking 335 degrees and dipping 65 degrees west; a crosscut was driven 16 metres but no ore was found. This work proved conclusively that there are a few short lenses of ore near the surface, extending down probably 12 metres, but the tonnage of ore proven would be very small and unprofitable (ca. 1923).