The Hadrynian and/or Paleozoic Silver Creek Formation (Mount Ida Group), a sequence of highly deformed, moderately metamorphosed rocks comprised of micaceous schist and quartzite, is intruded by Cretaceous? granodiorite and pegmatite equivalents. These rocks are locally overlain by conglomerates, which are overlain by andesitic and basaltic flows, all of the Eocene Kamloops Group.

A strongly radioactive zone is associated with the contact between the granodiorite and dark grey to black schist. The rocks are cut by quartz-feldspar-mica pegmatite. The north-northeast trending zone coincides with an interpreted fault. A GR410 Exploranium spectrometer recorded a total count of 10,430 counts per minute, with a uranium count of 598 counts per minute (backgrounds are 6000 counts per minute and 300 counts per minute, respectively). A nearby water sample analysed 20 parts per billion uranium and downslope soils assayed up to 130 parts per million uranium (Assessment Report 6982). Another radioactive zone occurs 1000 metres to the north.

This area also contains paleochannel gravels capped by basalt. However, no significant radioactivity was discovered associated with the indurated gravels.