For a fairly complete list of minerals from the “Dexter Group” of claims see Bullock, Kenneth C., “Minerals and Mineral Localities of Utah” Utah Dept. of Natural Resources Bulletin 117, 1981. Of primary interest are sulphates that occur in micro to small thumbnail sizes such as coquimbite, roemerite, voltaite and others in association with alunogen, halotrichite, jarosite and a mix of massive, soluble, crystalline sulphates. Uranium minerals are present but were not seen as ‘collectible’ specimens.

For picture of some of these species see location references in the MINDAT database at www.mindat.org

Workings at the Dexter No. 7 mine include short drifts and slopes largely open to the surface of the cliff face. Other than the access road the only other evidence of the operation remaining in the late 80’s was a cable, part of a tram system from the portal area to the base of the mesa, and remnants of shacks and trash dumps. While the literature describes coquimbite specimens from parts of the underground workings, there was nothing significant found underground.