The Diane occurrence is located on an east-facing slope, west of Tildesley Creek and approximately 12 kilometres west-northwest of Mount Sidney Williams.

Regionally, the area is underlain mainly by rocks of the Mississippian to Triassic Cache Creek Group. Into these, ultramafic rocks of the Trembleur Intrusives have been emplaced. The Cache Creek Group in this area comprises greenstone of andesitic composition, chlorite and amphibole schists, and minor chert.

The area of the original Diane claims, on the west side of Tildesley Creek, is underlain by the North Arm succession of the Cache Creek Complex, comprising variably foliated mafic metavolcanic and meta-intrusive rocks along with local metasedimentary intervals.

Three holes from two setups were drilled into this succession in 1995 to test copper-in-soils anomalies. The holes all encountered subeconomic chalcopyrite mineralization within a succession of predominantly chlorite-epidote-actinolite-calcite–altered mafic volcanic rocks. Slightly anomalous gold concentrations were associated with the highest copper concentrations (up to 500 parts per million copper) in all three holes (Assessment Report 24277).

Float samples from the area are reported to host disseminated to semi-massive and fracture-filling pyrite, pyrrhotite, chalcopyrite and bornite in volcanics and limestones. Covellite is also reported in the limestones, which have been locally altered to epidote-garnet skarn hosting disseminated to massive magnetite. The volcanics have been chlorite, epidote, tremolite and plagioclase altered whereas the limestones have been silicified and limonite altered.

Ultramafic rocks are highly anomalous in nickel, which occurs as heazlewoodite, bravoite, siegenite(?) and native nickel-iron alloy. In addition, certain phases of the ultramafic are highly anomalous in gold. The nickel sulphides occur as disseminations and on fractures throughout the ultramafic.

Work History

The Diane claim group was staked on the west side of upper Tildesley Creek in 1969, to cover an area of anomalous copper values identified in a reconnaissance silt sampling program. Soil sampling, electromagnetic and magnetic surveys were conducted over the claims later that year, but no follow-up work was recorded, and the Diane claims were allowed to lapse.

In 1995, Hera Resources Inc. completed a program of rock and soil sampling and five diamond drill holes, totalling 893.6 metres, on the area as the Bornite 1-11 claims.

During 1997 through 2012, Ursula Mowat completed programs of prospecting, rock sampling and geological mapping on the area as the Bornite property. In 1998, samples of peridotite from the Diane occurrence area yielded up to 0.190 per cent nickel and 0.088 per cent chromium (Assessment Report 26513).