The King Mountain occurrence is located about 70 kilometres east-southeast of the community of Dease Lake.

The area is underlain by upper Mississippian to Permian ultramafic rocks of the Cache Creek Complex. These rocks consist of peridotite, dunite and pyroxenite which are generally serpentinized.

Several nephrite veins are reported to occur in the King Mountain area. However, little commercial nephrite has been found because of the schistose structure exhibited by most of the deposits. Three small lenses occur in a saddle adjacent to the most westerly peak of the chain of peaks that make up King Mountain (Geological Survey of Canada Paper 78-19). Two other jade lenses are also plotted on Geological Survey of Canada Open File map 2779. One is 1 kilometre south of the western peak, on the ridge that extends southeast from the peak. The second is 1.5 kilometres east-southeast of the first.

During July and August of 2007, Turnagain River Exploration Ltd. conducted a reconnaissance exploration program over the Turnagain property, consisting of prospecting and heavy mineral concentrate stream sediment sampling over at least seven showings (King Kong, 104I 067; Spring, 104I 110; King Mountain, 104I 108; PR8, 104I 109; PR7, 104I 107; Alice Shea Jade, 104I 104; and Alice Shea Creek, 104I 005).