The Bethlehem (Snowstorm) deposit lies within the Early Jurassic-Late Triassic Guichon Creek batholith and is underlain by Guichon variety medium-grained quartz diorite and granodiorite. These rocks are intruded by northwest and northeast trending porphyritic dykes. Alteration consists of chlorite, sericite, epidote and quartz, which form crude zones paralleled by quartz, sulphide and hematite veinlets. Structure is an important ore control. The area is cut by northeast trending faults and zones of intense fracturing. Faulting is accompanied by kaolinitic gouge.

The Snowstorm "break" is a complex zone of fractures which strike from 360 to 075 degrees and dip moderately to the southeast. The rock along these fractures and subsidiary joints is propylitized and mineralized with bornite, chalcopyrite, molybdenite, malachite and azurite. In the Snowstorm workings, the mineralized zone is complex; three veins strike northwest to northeast. The main lode strikes 045 to 065 degrees and dips approximately 75 degrees to the southeast and is mineralized with bornite and chalcopyrite. The wallrock is strongly propylitized. The high-grade zone varies in width from 5 to 120 centimetres. Minor mineralization also occurs as stringers and on fractures in the quartz diorite. An age date from a sample of a mixture of magmatic and hydrothermal biotite from the Iona ore zone (092ISE006) returned 199 Ma +/- 8 Ma (Canadian Institute of Mining and Metallurgy Special Volume 15).

See Bethlehem mine (092ISE001) for production.