The Silver Boss (Horse Trail) occurrence is located at an elevation of approximately 2020 metres on a northeast–trending ridge of Big Timothy Mountain.

Regionally, the area is underlain by gabbroic to dioritic rocks of the Buster Lake unit and granodioritic intrusive rocks of the Boss Creek and Schoolhouse Lake units of the Late Triassic to Early Jurassic Takomkane Batholith, which have intruded basaltic volcanic rocks of the Upper Triassic Nicola Group. These have in turn been intruded and are locally overlain near the summit of Big Timothy Mountain by basaltic volcanic rocks of the Pleistocene Wells Gray volcanics.

Locally, a monzodiorite and diorite are cut by 20- to 30-centimetre-wide shear/fracture zones over a strike length of at least 100 metres and a width of 50 metres. The fractured zones generally trend northwest and dip moderately to steeply northeast with variably orientated, 0.5- to 30-centimetre wide, quartz veins hosting pyrite and chalcopyrite. Chlorite, epidote and tourmaline are also reported associated with the fracture zones and veins.

In 2004, a sample (151679) assayed 0.42 per cent copper, 0.013 per cent molybdenum, 28.0 grams per tonne silver and 2.4 grams per tonne gold, whereas a chip sample (151677) across 0.2 metre of vein material, taken 100 metres to the south of the previous sample, assayed 0.564 per cent copper, 43.0 grams per tonne silver and 0.791 gram per tonne gold (Assessment Report 27755).

In 2005, a sample (151725) of quartz vein material assayed 0.73 per cent copper, 40.0 grams per tonne silver and 1.04 grams per tonne gold over 0.10 metre, whereas a 0.45-metre-wide sample (184424) of quartz vein and diorite wallrock assayed 0.31 per cent copper, 30.0 grams per tonne silver and 0.86 gram per tonne gold (Assessment Report 28344).

In 2006, grab samples of outcrop, subcrop and float yielded up to 0.42 gram per tonne gold, 93.0 grams per tonne silver, 1.686 per cent copper and 0.637 per cent molybdenum (Assessment Report 28987).

In 2007, a sample (493465) assayed 10.01 grams per tonne gold and greater than 100 grams per tonne silver from a 4-centimetre-wide vein, whereas a sample (4417) from a from a 15-centimetre-wide vein assayed 3.38 grams per tonne gold, 48.0 grams per tonne silver and 0.231 per cent copper (Assessment Report 29970).

The area has been historically explored in conjunction with the nearby Silver Boss (MINFILE 093A 019) occurrence and Boss Mountain (MINFILE 093A 001) past-producing mine.

During 2004 through 2014, Happy Creek Minerals carried out programs of prospecting; geological mapping, 34.2 line-kilometres of 3D induced polarization and magnetic geophysical surveys and stream sediment, soil and rock geochemical surveys on the area as the Silverboss property.