The North Star prospect is situated on the northwest side of Rapid Creek, west of the Lardeau River, in the Slocan Mining Division. The property consists of two Reverted Crown grants (Lots 7859 and 7860).

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).

On the North Star property grey phyllitic rocks of the Index Formation are cut by metadiorite dikes. Quartz veins and stringers are developed within the dikes and at the contact with the phyllite. The veins carry arsenopyrite and free gold. Some veins are said to be "rich in gold" (Minister of Mines Annual Report 1914). At least one adit has been excavated to test the potential of the veins. The veins are both parallel and oblique to the foliation and follow a similar pattern to those of the Mobbs mine (082KSW096).