The Lamb Mountain occurrence is located on a northeast-trending ridge, near Lamb Mountain and approximately 106 kilometres north of the community of Dease Lake.
Regionally, the area is underlain by a north to north-northwest–trending series of sedimentary rocks, dipping approximately 70 to 80 degrees to the northeast, and comprising undivided sedimentary rocks of the Neoproterozoic Stelkuz Formation (Ingenika Group), quartz arenite sedimentary rocks of the Lower Cambrian Boya Formation (Atan Group), calcareous sedimentary rocks of the Lower Cambrian Rosella Formation (Atan Group), limestone, slate, siltstone and argillite of the Cambrian to Ordovician Kechika Group and Ordovician to Silurian Road River Group, quartz arenite sedimentary rocks of the Silurian to Lower Devonian Ramhorn Group and calcareous sedimentary rocks of the Devonian McDame Group. The sedimentary units have been locally intruded by an Upper Cretaceous (Lamb Mountain) quartz monzonite porphyry intrusive, and granitic rocks of the Lower Cretaceous Cassiar Batholith are exposed to the west.
Locally, an extensive skarn zone is developed in Lower Cambrian Rosella Formation (Atan Group) marbles adjacent to the Upper Cretaceous Lamb Mountain quartz monzonite porphyry stock. At the intrusive contact, magnetite-garnet skarn has formed and further from the contact garnet-diopside skarn with pyrrhotite lenses is present. At some distance from the intrusion, the skarn contains abundant tremolite. Scheelite occurs in the magnetite skarn and pyrrhotite lenses. Greisen pods with molybdenite occur along the intrusive-carbonate contact. An extensive zone of retrograde actinolite skarn contains molybdenite rosettes. The mineralized skarn zone has been traced for at least 330 metres along strike by trenching and diamond drilling.
In 1960 and 1961, sampling of trenches nos. 1, 2 (North Channel), 2 (South Channel) and 4 is reported to have yielded an average of 0.54, 1.05, 0.96 and 1.65 per cent molybdenite over 3.3, 3.6, 2.1 and 4.0 metres, respectively (Assessment Report 7965). Diamond drilling, also at this time, is reported to have yielded up to 0.49 and 0.83 per cent molybdenite over 17.3 and 12.8 metres in holes 4 and 5, respectively (Assessment Report 7965).
In 1978, samples of rubble from trench No. 1 (Ridge Crest) yielded an average of 0.70 per cent tungsten tri-oxide over 10 metres, whereas a grab sample from trench No. 4, located approximately 480 metres south and 190 metres lower than trench No. 1, assayed 0.72 per cent tungsten tri-oxide (Assessment Report 7242).
In 1979, drilling yielded up to 0.57 per cent tungsten tri-oxide over 4.7 metres in hole 9W 2 and 0.36 per cent tungsten tri-oxide over 24.9 metres in hole 9W 4, whereas drillhole 9W 7 intersected 8.7 metres of actinolite-rich skarn hosting molybdenite but no assays were reported for this section (Assessment Report 7965).
Work History
In 1961 and 1962, Fort Reliance Minerals Ltd. completed program of trenching and 16 diamond drill holes, totalling approximately 2100 metres, on the area as the Star group. In 1977, the area was restaked as the Windy 1 claim by William Kuhn. In 1978 and 1979, Union Carbide Canada Ltd. completed programs of geological mapping, geochemical (rock and soil) sampling, ground magnetic and electromagnetic surveys and seven diamond drill holes on the area as the Windy 1 and M 1-4 claims. In 1980, Shell Canada Resources Ltd. conducted a program of geological mapping and geochemical (rock and soil) sampling on the surrounding area as the Karhu claims.
In 2011, a program of prospecting, geological mapping and geochemical (rock and soil) sampling was completed by UTM Exploration Services Ltd. on the area as the Windy claims. In 2013, a further program of prospecting and rock sampling was completed. In 2018, the area was prospected and sampled by Bruce W. Downing.
