The lower Paleozoic Sicamous Formation (Mount Ida Group) comprised of calcareous phyllite and limestone is underlain by schist of the Hadrynian and/or Paleozoic Silver Creek Formation (Mount Ida Group). This sequence is intruded by altered Cretaceous? granites and capped by Eocene volcanics of the Kamloops Group.
The rocks in the vicinity of the Mount Ida workings comprise mica schist, grey gneiss, crystalline limestone and quartzite. In this sequence, a system of parallel quartz veins, from 0.4 to 2.1 metres wide, are mineralized with argentiferous galena, sphalerite and pyrite. These bodies occur at the contact between micaceous schist and quartzite, and between schist and limestone. The strike of these is approximately northeast with 65 degree to almost vertical dips to the southeast.
All the development work had been performed on the Everglade claim and consists of an upper adit 39 metres long, and a lower adit 70 metres long. Shafts, 4.8 and 4.5 metres respectively, had also been sunk. Opencuts have also been made.
In 1918, a chip sample of the sulphides in the quartz veins was taken at random from both walls of a lower tunnel (described to be on the White Cliff claim, but may in fact be the Everglade claim) and yielded 13.0 grams per tonne gold and 1.02 grams per tonne platinum (Munition Resources Commission, Final Report 1920, page 184).