Iron ranges, pyrite deposits and diamond-drilling records map the mineral wealth of Ontario's Algoma district in these sheets from Michipicoten Iron Ranges. They accompany the Geological Survey of Canada's 1926 memoir by W. H. Collins, T. T. Quirke and Ellis Thomson, beginning with regional geological mapping of Michipicoten and Missinaibi, the Goudreau pyrite area and a sketch map of a numbered township. More detailed sheets examine the Helen iron range and the Holdsworth pyrite deposit, pairing surface plans with vertical sections.
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