The Pedro occurrence is located at 1460 metres elevation above sea level near the head of Mobbs Creek, 2.5 kilometres northwest of Tenderfoot Lake 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 Tenderfoot Lake area is mainly underlain by the Mesozoic Mobbs Creek and Rapid Creek quartz monzonite stocks and the Early Jurassic Kuskanax monzonite batholith to the west. Grey quartz mica schist of the Broadview Formation along with marble, micaceous schist and amphibolite of the Paleozoic Milford Group form tightly folded rafts between the stocks and the batholith. The rocks have undergone contact and regional metamorphism to middle or upper greenschist facies (Geological Survey of Canada Bulletin 193).

The Pedro showing consists of two quartz veins, 60 to 90 centimetres wide, mineralized with galena, sphalerite, tetrahedrite and pyrite. The veins, which have been developed with a short adit, are probably hosted in micaceous schist of the Milford Group.