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Location: 76 km SE from Webequie, Ontario, Canada
1127 Premier Way, Unit 1Thunder BayOntario, CanadaP7B 0A3
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Eagle’s Nest is a sub-vertically dipping body of massive magmatic sulphides (MMS) in the form of a flattened pipe approximately 200 m long and 60 m thick, and currently defined vertically to 1,650 m. The deposit remains open along strike and occupies the northwestern margin of a vertically-inclined serpentinized peridotite dyke that is present in subcrop over a north-south strike length of about 500 m with a maximum width of about 75 m. The massive sulphides within the top 250 m are confined to a volume occupying the northwestern tip of this body, and are bordered to the southeast by a thicker zone of net-textured sulphide hosted by serpentinized peridotitic cumulates. Below 250 m, the massive sulphides can be found throughout the mineralization and, in some cases, into the surrounding granodiorite. The dyke is open at the north and south ends, and plunges very steeply to the south or vertically. The exact attitude of the sulphide-filled keel at the northern tip of the dyke is impossible to state because of the irregularity of the contact. Although a considerable amount of local deformation is evident around the contacts, particularly where they are occupied by massive sulphide, the body appears to be essentially still in place and not significantly deformed. The Eagle’s Nest deposit mineralization is confined within a single ultramafic unit and, therefore, no geological domains are applicable to the resource estimation process. The deposit comprises two segments – the Main Zone and the East Zone. The Main Zone is a pipe-like body that dips sub-vertically with the longer axis in the dip direction. It is approximately 200 m along strike in a north-south direction, 40 to 60 m wide and is open at depth beyond 1,500 m below surface. The East Zone is a north-south striking tabular body, about 200 m east of the Main Zone. Its dimensions have not been fully established as it is open-ended along both strike directions and at depth. The Ni-Cu-PGE mineralization is associated with massive/semi-massive, net-textured and disseminated sulphides. The major sulphide minerals identifiable with a hand lens are pyrrhotite, pentlandite and chalcopyrite with accessory magnetite. The pattern of distribution of the sulphides is not discernible due to one or a combination of the following factors: (a) the drill holes intersecting the deposit are at highly variable angles, (b) extreme physical deformation, as evidenced by the narrowing and twisting of the Main Zone 100 m below surface coupled with metamorphism, have obliterated the original fabric of the minerals and the overall geometry of the bodies. Thus, wire-framing to differentiate the three sulphide mineralization patterns is not possible or practical. Despite the obliteration, drill hole intercepts show that Ni-Cu-PGE are concentrated in the same broad zone. There is no geological reason to believe that massive sulphides would be restricted to the upper, middle or lower zones of the deposit.
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