The Maggie May occurrence is located on Reverted Crown grant Lot 2437 near the mouth of Tenderfoot Creek 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 Maggie May occurrence consists of an irregular quartz vein up to 60 centimetres wide. The vein is within grey phyllite of the Index Formation of the Lardeau Group. Argentiferous galena occurs in massive pods throughout the vein which has been explored with several trenches and at least two short adits. Mapping in 1987 failed to locate the old workings (Property File - Geological Report on the John L. and Maggie May Claims, 1987).

In 1987, Northern Crown Mines Ltd. optioned the property and conducted prospecting, mapping, sampling and diamond drilling.