Small syenite bodies of Triassic to Jurassic age are interspersed in a limy mudstone facies of the Devonian to Permian Harper Ranch Group, which grades into silty, thinly bedded limestone and massive limestone pods away from the syenite intrusions. The largest syenite body is very coarse grained, except at the contact with the metasediments, with feldspar laths up to 6 centimetres long in a chaotic matrix.

Sulphide mineralization is generally restricted to the silicified metasediments and syenite at the intrusive contacts, a zone about 15 metres wide. Pyrite is the most common sulphide, with minor galena and chalcopyrite, associated with quartz flooding at the contact margin, and in veins intruding both syenite and metasediments in the contact zones. Very little sulphide mineralization is found away from the contacts, although large quartz veins were observed in the coarse-grained syenite. The unsilicified limy mudstone and limestone away from the intrusions are also barren of sulphide mineralization.

Just west of the radome on Mount Lolo, large quartz boulders with 1 to 2 centimetre blebs of specular hematite were found. These were traced to their source in a cliff about 100 metres east of the radome at the peak of Mount Lolo.

The Lolo claim block was staked by Asamera Minerals Inc. to cover anomalous gold, silver, platinum and palladium results detected in streams draining Mount Lolo during a reconnaissance heavy mineral program in 1986. A followup prospecting and geochemical sampling program was carried out in 1987, and the results were encouraging enough to warrant more detailed sampling over the anomalous areas in 1988.