The Morraine showing area is underlain by the Jurassic Hazelton Group, dominated by intermediate flows and pyroclastic and volcaniclastic rocks of the Lower Jurassic Telkwa Formation, which is overlain or in fault contact with Smithers Formation, consisting mainly of maroon and green volcaniclastic sedimentary rocks and lesser mafic flows.
The Moraine zone is centred on an extensively brecciated and altered aphanitic rhyolite exposed over 150 meters width in a cirque on the west side of the ridge 1.4 kilometres southwest of Troitsa Peak. The rhyolite is interpreted as a brecciated Eocene rhyolite dome that intrudes the base of the Ootsa Lake Group. The dome is associated with autoclastic and pyroclastic breccias with proximal mantling tuff-breccias. It is in part overlain and flanked by cogenetic extrusive flow-banded rhyolite flows and ash flow tuff, and in part by andesite flows and breccia. It is also partly overlain by an Ootsa Lake Group megacrystic feldspar porphyry dacite/andesite sill. Proximal monomictic flow-dome breccias are pervasively clay and silica altered with local silica stockwork breccia zones and local pyrite, tetrahedrite, sphalerite and galena bearing quartz veins and amethystine quartz pods. Peripheral to the rhyolite dome in the host Hazelton Group volcanics the alteration varies from strong pyrite and silica with variable clay
It is a conspicuous zone of intense clay/sericite-quartz-pyrite alteration exposed in a cirque. The zone is exposed at elevations between 1740 and 1850 metres, and extends downslope into areas covered by extensive moraine and talus. Rock chip sampling of the zone in 1982 returned several samples with highly anomalous precious metal values. A channel sample of a quartz vein assayed 3.84 grams per tonne gold and 105.94 grams per tonne silver (Assessment Report 10875).
In 2005, a chip sample from an epithermal-style vein assayed 2.32 grams per tonne gold and 15.2 grams per tonne silver (McRoberts, S.S. (2009-05-01): Summary Report on the Troitsa Property).
Refer to Cummins Creek Veins (093E 100) for common details of the area work history.
