The Hotham occurrence is underlain by Mesozoic Coast Plutonic Complex diorite near a contact with a tonalitic phase of the intrusion.

Several parallel shear zones, ranging from 2.0 centimetres to 1.0 metre in width, host minor quartz, pyrite, chalcopyrite and sphalerite mineralization in the wider portions of the zones. The mineralization is accompanied by epidote and chlorite alteration and silicification. The shears strike 070 to 075 degrees and dip 65 degrees north.

A grab sample from a mineralized shear assayed 1.56 per cent copper and 26.4 grams per tonne silver. A maximum value of 0.69 per cent zinc is also reported (Assessment Report 14272).