The GC (Prof) occurrence is located on Tonkawatla Ridge approximately 5 kilometres north- north west of Victor Lake.

The area lies on the south flank of the Frenchman's Cap gneiss dome in the Shuswap Metamorphic Complex. Gneiss, quartzite, schist, calc-silicate rocks, minor marble and argillite are iso-clinally folded with easterly trending structures. Folding and jointing are common with planes intruded by swarms of pegmatite and lamprophyre dikes.

Locally, the area is underlain by calcsilicate metamorphic and paragneiss units of the Proterozoic to Lower Paleozoic Monashee complex.

Locally, a 3 to 6- metre wide pegmatite dike of coarse-grained quartz, feldspar with black and pink tourmaline is hosted by a biotite (lepidolite) schist. Minor amounts of beryl and rose quartz are also reported. The pegmatite trends 062 degrees and has been followed for 65 metres. Other pegmatite dikes, referred to as the Green, Grail and Red, are located approximately 3 kilometres to the east.

In 1968, the area was prospected, silt sampled and mapped by Stampede Oils as the GC claim.

In 2013, two rock samples (48193 and 48194) of the pegmatite dike assayed up to 0.111 per cent caesium and greater than 0.2 per cent lithium and rubidium, respectively (Assessment Report 34293). In 2015, rock sampling yielded values up to 1.72 per cent lithium, 0.124 per cent caesium and greater than 0.2 per cent rubidium (Assessment Report 36579). In 2013, Addie completed an exploration program over the property containing the occurrence including geological mapping and sampling of 21 pegmatite showings. Lepidolite with pink and/or green tourmaline, beryl and rose quartz were identified at these showings.

In 2015, First Energy Metals prospected and rock sampled the area.