At the McKee Creek Magnesite occurrence, brown-weathering outcrops of magnesite occur near the headwaters of McKee Creek about 15 kilometres south-southeast of the community of Atlin.

The showing area is underlain by Mississippian to Triassic Kedahda Formation (Cache Creek Complex) sediments (argillites?) that host several small plugs or stocks of upper Mississippian to Permian ultramafic rock of the Cache Creek Complex.

The McKee Creek showing may be similar in style of mineralization (magnesite veins in argillite near ultramafic intrusions) to the Pike occurrence (104N 103) located about 14 kilometres south-southwest.