The area of the Laura M is underlain by limestone, schist and greenstone of the Mississippian to Lower Permian Milford Group. The property was part of the Kootenay Florence mine (082FNE016) and was developed in conjuntion with that property.
Production from the Kootenay Florence group consisted of silver, lead, zinc, cadmium and gold. Replacement ore in limestone consists of galena and sphalerite with some pyrite and chalcopyrite. Gangue minerals include quartz, calcite and fluorite.