This occurrence outcrops atop a ridge, 750 metres southwest of the confluence of Siwash and Galena creeks and 37.5 kilometres north-northeast of Princeton.

The Blue Stone showing occurs in an 8-metre wide breccia zone in granite of the Middle Jurassic Osprey Lake batholith, immediately south of a northwest-trending body of quartz porphyritic monzonite/granite of the early Tertiary Otter intrusions.

A quartz vein, 2.5 to 10 centimetres wide, strikes 100 degrees and dips 77 degrees north. An adit, 50 metres long, intersected the vein 15 metres below a series of opencuts. The vein is mineralized with tetrahedrite and pyrite, and the occasional grain of galena and sphalerite. Abundant azurite occurs on the vein in the old workings.

The showing was explored by F. Barber and W. Cunningham in 1927.

The area has been explored in conjunction with the nearby Snowstorm (MINFILE 092HNE032) occurrence and completed exploration history can be found there.