The Pup property, which includes 40 claim units, was staked in 1989 to cover a zone of intensely brecciated and pervasively mineralized volcanic rock that crops out at the confluence of Pup (local name) and Tomahnous creeks.

Clasts within the breccia are one to five centrimetres in diametre, subangular to subrounded and are crudely stratified. They are predominantly dark grey, fine-grained chlorite and sericite-clay-altered volcanic rocks with minor oxidized quartz and calcareous sediments. In places, oxidation and leaching has produced a porous, poorly consolidated mass of breccia fragments with coarse-grained, oxidized sulphide cllusters occupying solution cavities. Minerals identified include cuprite, copper carbonates, fine-grained pyrite ane chalcopyrite. Late quartz veins cut the breccia. Iron oxide cemented boulders occur in the lower part of Pup Creek and clay-rich faulted gouge was observed in the bed of Tomahnous Creek. Quartz-carbonate veining is reported north of the creek but was not examined.

Samples from the mineralized breccia are reported to contain up to 1.03 grams per tonne gold, 12.4 grams per tonne silver, 1.67 per cent copper, and 0.07 per cent molybdenum.

The Pup breccia is located along a major fault zone that trends parallel to Tomahnous Creek and may connect with a strand of the Tats Creek fault zone northwest of the Tatshenshini River. Intensely fractured granitic rocks crop out downstream from the breccia zone. The breccia is believed to have formed by explosion of a high-level cupola above a subvolcanic intrusion that may have been emplaced into the fault zone (McDouglall, 1990b).

The poorly consolidated nature of the Pup Creek breccia and its location along a fault zone that offsets Early Tertiary sediments in Tats Creek suggests brecciation and mineralization are post-Paleocene to Recent in age.