Ken Ashton: SIR (Saskatchewan Industry and Resources)

Ongoing compilation of the 1:250,000 scale Tazin Lake map area (74N) shows that it is dominated by 3.0, 2.6, and 2.3 Ga age orthogneisses and subordinate supracrustal rocks, including an undated pelitic sequence and the 2.3 Ga Murmac Bay Group. The Thelon-Taltson Orogen is manifest in: 1) the greenschist facies 2.02-1.97 Ga Waugh Lake Group of sandstones, pelites, and volcanic rocks, and 2) ca. 1.96 Ga arc rocks of the Taltson Magmatic Zone in the far west, and 3) widespread intense deformation with an associated 1.90 Ga amphibolite to granulite facies metamorphic overprint. Known mineral deposits include: 1) past-producing 'vein-type' unconformity U deposits associated with both the Martin and Athabasca groups, 2) past-producing lode Au in lower amphibolite facies rocks of the Beaverlodge Mining Camp, 3) Cu-Ag-Pb veins at unconformities between the basement and the Thluicho Lake and Waugh Lake groups, and 4) REE occurrences, which may result in part from concentration during the partial melting of widespread allanite-bearing orthogneisses.

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