The area is underlain by probable Lower Paleozoic Lardeau Group metasediments and metavolcanics.

Serpentine layers occur in talc and graphitic schists. Some of the serpentine contains stringers and veinlets of asbestos of actin- olitic variety. The rocks strike north-westerly and dip 25 to 40 degrees northeast. Limestone occurs a short distance to the east of the showing.

Exposures in three crosscut tunnels show graphitic and talc schists with serpentine layers. Several "layers" of talcose material are reported. The rocks strike northwest and dip moderately north- east. At the No. 1 adit, 50 metres above the Columbia River, a 2.1 metre width of "fair quality" talc is reported. Impurities include fine-grained magnetite. An analysis of this material yielded the following percentages (O'Grady, 1922).

________________________
Silica              61.0
Fe-oxide             4.9
Alumina              0.6
Magnesia            32.0
Lime               trace
Loss on ignition     1.0
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Similar material obtained from further within the same tunnel were analysed and found not to be composed of talc.

Some of the serpentine contains stringers and veinlets of asbestos of actinolitic variety.