The Ymir Graphite showing is located along the north fork of Porcupine Creek, 16.5 kilometres east of Ymir.

The area is underlain by black slate, black limestone, calcareous argillite and quartzite of the Middle Cambrian Nelway Formation. In the black slates, a well developed, steeply dipping cleavage parallels the northerly trend of the creek.

These slates contain fine flakes of mica and locally flakes of graphite on cleavage surfaces. It is considered that the graphite grade and tonnage potential is much too low to be of economic interest.