Physical Volcanology, Hydrothermal Alteration and Massive ...

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Figure 3.Figure 4.Figure 5.Figure 6.Figure 7.Figure 8.Figure 9.Figure 10.Simplified geological map of the SturgeonLake Caldera Complex. 6Stratigraphic correlations between theF-Group and Mattabi areas. 16Distribution of ore-forming alterationassemblages associated with the F-Group area. 20Distribution of ore-forming alterationassemblages associated with the Mattabi area. 21Geological plan map of the F-Group areawith field trip stop locations. 23Geological sketch map of the Higt"l LevelLake Succession outcrops south of the Mattabi Mine. 27Geological -plan map of the Mattabi area, withfield trip stop locations. 28Geological plan map in the vicinity of theLyon Lake - Creek Zone - Sturgeon Lake orebodies,with field trip stop locations. 33
INTRODUCTIONThe south Sturgeon Lake area of northwestern Ontario (Fig. 1) is underlain by awell preserved, though partially eroded, Archean submarine volcanic caldera. This calderais host to five massive sulphide deposits (Mattabi, F-Group, Sturgeon Lake Mine, CreekZone and Lyon Lake)(Fig. 2, Table I) as well as numerous subeconomic massive sulphideoccurrences. The Sturgeon Lake Mine, F-Group and Mattabi deposits were depleted ofreserves in 1981, 1984 and 1988 respectively, whereas production at the Lyon Lake andCreek Zone deposits ceased in 1991.Table I. Grade and tonnage figures of the ore deposits in the south Sturgeon Lake area.Deposit Tonnage . Zn Cu Pb Ag(10 6 tons) % % % oftMattabi 12.55 8.28 0.74 0.85 3.31F-Group 0.38 9.51 0.64 0.58 1.92Sturgeon Lake 3.95 6.53 1.24 0.63 3.42Lyon Lake &Creek Zone 3.17 8.67 1.26 0.99 4.50• Production grade and tonnage figures1
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Physical Volcanology, Hydrothermal Alteration and Massive ...

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