In general, the Round Lake zone is underlain by Lower Jurassic Telkwa Formation (Hazelton Group) volcanics. The volcanics are predominantly tuffs, agglomerates and grey to green andesites. Minor porphyritic (plagioclase and/or hornblende) flows and interflow sedimentary rocks are also present. The volcanic rocks are intruded by narrow quartz feldspar porphyry dikes which are 1 to 3 metres wide and strike northeast. The dikes, fine to medium-grained, are possibly related to the Eocene Kastberg Intrusions.

Very little sulphide mineralization was noted in the Round Lake area where a large zone of silicification in the form of ‘ribboned’ quartz veins occurs within the lower dacitic unit. The dacite is cut by abundant narrow quartz veinlets with 200 metres wide by 800 metres long and may be genetically related to an eruptive centre. The intensity of silicification decreases to the southeast, towards 'Coccola Lake’ as the unit thins, and to the northwest, beyond ‘Round Lake’. Limited sampling was done in 1996 by Imperial Metals, with only a few grab samples being taken of the veins to test for precious metal content. Only one sample, #136511 yielded anomalous results assaying 13.7 ppm silver, gold assays were low (Figure 5, Assessment Report 24882).

Refer to Bearnx (094D 003) for related geological information and a common work history.