St.Anthony Mine, Squash Lake Area, Thunder Bay District, Ontario, Canadai

Regional Level Types
St.Anthony Mine	Mine
Squash Lake Area	Area
Thunder Bay District	District
Ontario	Province
Canada	Country

Discovered in 1899.
The main ore body is a north-south fissure vein at the contact between Keewatin pillow lavas and a small dome of granodiorite, which is an offshoot from the granodiorite boss in the North Arm. A coarse grained quartz porphyry stock has intruded along the same contact and has caused the alteration of the granodiorite to a protogine granite consisting almost entirely of quartz and sericite. The quartz veins that accompanied the intrusion of the porphyry stock have caused alteration along their walls. The northern portion of the main vein in the granite branches and reunites to form a stockwork. The wall rock has been altered to sericite schist. The southern portion of the vein in the greenstone tends to follow the rock cleavage. The wall rock has been altered to a banded carbonate sericite schist. The veins dip slightly to the west and the ore bodies rake to the southwest following the quartz porphyry stock Historically work focussed on the gold potential of quartz veins only and paid little to no attention to mineralization in altered wallrock. Historic work recognized low grade gold was present in the pyritic sericite stockwork country rock but anything less than 3-5 g Au was not of economic interest. Typically the highest gold grades are found in various quartz veins and historic work used the presence of sphalerite and galena as an indicator for higher gold grades ie.10-140 g Au Reference: Evans, G., Technical Report on the St Anthony and Best Properties for Pacific Iron Ore Corp, July 2009.

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References