The property covers a coincident arsenic-gold-tungsten antimony stream sediment anomaly identified by a GSC regional stream sediment sampling survey. This anomaly reflects the widespread occurrence of arsenopyrite and the more discrete occurrences of gold, scheelite and stibnite. The metallogenic signature also includes anomalous values for Ag, Bi, Mo, Pb and Te as do other examples of TPS intrusion-related mineralization.
Two main stages of alteration and mineralization are documented on the property. Early, calc-silicate alteration is developed in metasedimentary rocks peripheral to the coarse-grained, granodioritic Sheelite Dome intrusive. The greenschist facies metasedimentary rocks are hornfelsed and contain significant disseminated pyrrhotite and foliation parallel quartz veining with variable but ubiquitous arsenopyrite and local scheelite. The earlier calc-silicate alteration is cut by thin (<0.02 m), planar, sheeted, high angle quartz-kspar-arsenopyrite-scheelite veinlets with thin phyllic alteration halos. Locally, as fracture density increases the phyllic alteration overprints the earlier calc-silicate alteration. A third alteration/mineralization type is quartz plus silver sulfosalt veins that are younger (?) than the phyllic alteration. Gold mineralization is hosted in all alteration types with higher grades being associated with the sheeted quartz vein/phyllic alteration event and the silver sulfosalt-bearing veins in general. In the Tom Zone however, high-grade gold mineralization is associated with the early, coarse grained calc-silicate alteration.