Geological Survey of Canada Memoir 249 describes "A deposit of gypsum occurring on a bench known as Kelly flat on the east side of Carabine Creek". Showings occur in several pits and cuttings along the road leading to the Hardie Mountain cinnabar property (see Hardie Mountain, 092INE037; and Hardie Hill, 092INE058). Apparently at one time deposits of gypsum were mined from this locality, but no information is available as to the amount shipped or the extent of the deposits. A general sample combined from samples taken at the different exposures was partly analysed and showed 43.1 per cent lime and 15 per cent sulphur.

The area appears to be underlain by the Upper Triassic Nicola Group comprising porphyritic volcanic breccias with intercalaed argillite.