The SB 1 occurrence is situated between Hope and Lake creeks just south of Mount Johnson in the Slocan Mining Division.

Regionally, the area lies within the Selkirk Mountains of southeastern British Columbia. The occurrence is within the Kootenay Arc, a curving belt of highly deformed metasedimentary and metavolcanic rocks which includes the Upper Proterozoic Horsethief Creek Group, the Upper Proterozoic to Lower Cambrian Hamill Group, the Lower Cambrian Badshot Formation, and the Paleozoic Lardeau and Milford groups. The volcano-sedimentary sequence is intruded by numerous Paleozoic to Mesozoic granitoid plutons.

The Lardeau River area of the Selkirk Mountains is mainly underlain by massive pillow lavas, volcanic breccia and green phyllitic rocks of the Index Formation and by grey-green mica schist of the Broadview Formation. Grey phyllitic rocks and marble of the Milford Group are exposed near the edges of the Mesozoic Mobbs Creek, Rapid Creek and Poplar Creek stocks. All rocks have undergone regional metamorphism to middle or upper greenschist facies. Rocks of the Milford Group have also been affected by thermal metamorphism (Geological Survey of Canada Bulletin 193).

The occurrence is underlain by limestone, schist and arenites of the Index Formation of the Lardeau Group. The strata are overturned on the limb of an anticline. Drag folds plunge northwest and the area is cut by two northwest trending transverse faults.

At the SB 1 showing disseminated galena and sphalerite occur in bands of silicified limestone near the contact with underlying arenite strata. The bands are lenticular in shape and appear to be controlled by the northwest plunging drag folds. Most of the mineralization is low grade (Assessment Report 86).