The Maggie occurrence is located at the head of Mat Creek at 2375 metres elevation above sea level 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.

No geological description could be located for this occurrence, however, it is situated west of a northwest-trending fault that separates sandstone, siltstone and phyllite of the Broadview Formation from andesitic tuffs and flows of the Index Formation to the east. The rocks are deformed in a series of northwest-trending folds. The occurrence is reported to contain gold and copper values (Assessment Report 18136).