The Eaglet Lake showing is underlain by a northwest trending succession of pillow basalts and minor limestone and argillite. These rocks belong to the Mississippian Slide Mountain Group along with associated mafic and felsic intrusive rocks. Basalts of the Takla Group occur to the east separated from the Slide Mountain Group by a branch of the McLeod Lake fault. The sequence is partly intrud- ed by and partly in fault contact with the Eaglet Lake stock to the east. A small serpentinized intrusion occurs along the branch of the McLeod Lake fault.

Mineralization consists of galena, sphalerite, molybdenite and chalcopyrite with traces of silver, tungsten and nickel in serpen- tinite.