Gillies Island is located approximately 25 km NE of Eagle Point mine, along the NE extension of the Collins Bay-Eagle Point structural corridor (see 1st vertical derivative magnetics). The bedrock geology and structural setting of Gillies Island are virtually identical to Collins Bay and Eagle Point mines. Bedrock on the island comprises graphitic pelite, psammite-quartzite, and nearby calc-silicate rocks, located SE of a granitic dome on Fife Island to the north. Strong electromagnetic (EM) conductors trend NE in the channel between Gillies and Cleveland Islands, likely dipping SE below Cleveland Island.
Historical drilling has intersected thick graphite seams in metasedimentary rocks SW of Gillies, but to date no significant subsurface uranium mineralization has been discovered in the area. Historical prospecting in the area uncovered several metasedimentary- and pegmatite-hosted uranium occurrences, and several trenches were blasted on both Gillies and Cleveland Islands. The area is crossed by at least three north-trending Tabbernor faults, and historical lake sediment geochemistry has identified moderately elevated uranium values in lake-bottom sediments in the area. Though the area has experienced sporadic exploration activity over the years, the main SE-dipping conductors beneath the island do not appear to have been thoroughly drill-tested.
Due to the geological similarity between Gillies Island and Collins Bay-Eagle Point mines, this area is considered to be a high-priority exploration target at this time