The Highway 3 Roadcut occurrence is located southeast of the Crowsnest Highway in the Crowsnest Pass area and approximately 2.9 kilometres west-northwest of the north end of Summit Lake.

Regionally, the area is underlain by a series of generally north-trending sedimentary rocks including dolomitic carbonate rocks of the Mississippian Etherington, Mount Head and Livingstone Formations (Rundle Group) and Pennsylvanian to Permian Rocky Mountain Group, fine clastic sedimentary rocks of the Triassic Spray River Group, undivided sedimentary rocks of the Jurassic Fernie Formation and undivided sedimentary rocks of the Jurassic to Cretaceous Kootenay Group.

Locally, at the Highway 3 Roadcut showing, phosphorite, phosphatic shale, shale and limestone of the basal Jurassic Fernie Group unconformably overlie siltstone and shale of the Triassic Sulphur Mountain Formation (Spray River Group).

A 1 metre thick pelletal phosphorite bed containing 15.75 per cent P2O5 immediately overlies a 0.7-metre thick Triassic shale bed (Open File 1987-16). Overlying the phosphorite is a 1.9-metre thick phosphatic shale unit containing 3.10 per cent P2O5.

In 1989, sampling of an outcrop along Highway 3 is reported to have yielded up to 24.59 per cent P2O5, 0.063 per cent yttrium, 0.020 per cent cerium and 0.031 per cent lanthanum over 0.48 metre (sample SB86-15B; Assessment Report 19942).

In 2014, a float sample (CPM Grab) from the Highway 3 roadcut yielded 14.4 per cent P2O5 (Assessment Report 35131).

In 2022, a sample (CRO-53) of phosphate-bearing mudstone, taken along Highway 3, yielded 25.3 per cent P2O5, 0.025 per cent cerium, 0.039 per cent lanthanum and greater than 0.050 per cent yttrium (Assessment Report 41308).

Work History

In 1989, Formosa Resources conducted a program of prospecting, geological mapping and rock sampling on the area immediately to the south as the High Rock 1-4 claims. In 2002, a program of geological mapping and rock sampling was completed on the area as the Cro claims. In 2013 and 2014, Fertoz International Organic Inc. conducted programs of prospecting and rock sampling on the area as part of the Crowsnest property. In 2019, Fertoz International Inc. conducted a minor program of prospecting and rock sampling on the area as the Summit property. In 2022, High Brix Manufacturing Inc. conducted a further program of prospecting and rock sampling on the Cro property. In 2024, Fertoz International Organic Inc. conducted a program of prospecting and rock sampling on the area as part of the Alexander Creek property.