The PYCU occurrence is a skarn showing, just 400 metres west of the Deer Lake skarn prospect (092P 010), about 20 kilometres northwest of Little Fort. The skarn formed in Nicola Group volcanic rocks that are intruded by mafic rocks of the Triassic-Jurassic Dum Lake Intrusive Complex.

The skarn is on the old Fort 9 claim. The claim is underlain by sedimentary and volcanic rocks of the Upper Triassic to Lower Jurassic Nicola Group. Medium to coarse grained siliceous diopside skarn contains heavily disseminated, medium to fine-grained pyrrhotite which is locally massive. Minor chalcopyrite is present as medium grained interstitial blebs in some parts of the skarn. Pyrite is common. The best of 19 chip samples taken from trenches in 1987 analysed 4.2 grams per tonne gold (Assessment Report 16134).

Skarn mineralization near Deer Lake was discovered at the nearby Lakeview showing (092P 010) in 1930. Several old trenches date from that period. In the late 1960s and early 1970s, the area was explored for porphyry copper-style mineralization by Anaconda, United Copper Company and Rio Tinto. During that time, the Fort 9 claim was explored by soil geochemical (not including gold) and magnetometer surveys. Meridian Resources conducted some work, including two percussion holes for 455 metres in 1977. In 1980, Tunkwa Copper Mines Limited conducted geochemical soil sampling (including gold), magnetometer and VLF-EM surveys on the claim area. C.J. Westerman conducted geological, geochemical and geophysical work, and excavated two trenches and took 19 chip samples (including the gold result cited above) from the property in 1987, on behalf of Electrum Resources Limited. In late 1988, Vital Pacific Resources Limited cut a new grid, which ran across the south edge of the Fort 7 claim, on part of their Haida property. They ran ground geophysical surveys over the new grid that fall. The showing was looked at as a part of the Deer Lake property during a prospecting and stream sampling program by Electrum Resources Corporation in 1999. The B.C. Geological Survey conducted a regional till geochemistry program over NTS mapsheets 092P09W and 08W in 1999 (Open File 2000-17).