The Jackpot Lerwick prospect is located on the ridge between Hidden and Porcupine creeks, 10 kilometres northeast of Salmo.

The Jackpot Lerwick zone is within dolomitized limestones of the Reeves Formation of the Lower Cambrian Laib Formation (correlative with the Badshot Formation). The dolomite is intruded immediately to the west by a tongue of diorite from the Hidden Creek stock of the Middle to Late Jurassic Nelson Intrusions. Most contacts with other rock types are discordant. The showing area contains rock units with complex structural and stratigraphic relationships. The Jackpot orebodies are thought to be Kootenay Arc-type carbonate hosted sedimentary exhalative (sedex) deposits.

Mineralization consists of disseminated sphalerite, pyrite, and pyrrhotite in a west dipping zone of dolomite which is extensively oxidized at surface. Sulphides occur in layers more massive than the East Zone. Mineralized bands are in the order of 1 to 3 metres thick and outcrop over a width of about 75 metres interbanded with barren dolomites. The mineralized zone has been traced over 153 metres on surface although individual sulphide bands are not known to continue for more than about 30 metres. Pyrrhotite is the dominant sulphide in the Lerwick zone.

This occurrence has had extensive exploration work carried out but no significant production has been documented. Reserves and work history are reported in the Jackpot Main (082FSW012) deposit.

Tombstone Explorations Co. Ltd. acquired the Jackpot property from New Jersey Zinc Explorations Company (Canada) Ltd. in 1997.