Geology and Mineralization
posted on
May 18, 2008 06:05AM
Producing Mines and "state-of-the-art" Mill
The McWatters deposit is hosted by ultramafic rocks that form part of, or
intrude, the Tisdale assemblage that flank the Shaw Dome and form part of the
Abitibi greenstone belt (AGB). The Abitibi greenstone belt is one of the
youngest parts of the Archean Superior Province forming what is considered
one of the largest and best-preserved belts of its kind in the world. To date
five Ni-Cu-(PGE) deposits have been discovered in the Shaw Dome
(Redstone, Hart, McWatters, Langmuir #1, Langmuir #2), and numerous
showings have been identified.
The McWatters deposit differs markedly from the rest of the known deposits in
the Shaw Dome. The ultramafic body hosting the McWatters deposit is
discordant, evidently cutting up through the iron formation that sits
immediately on its north flank, as indicated by recent, more detailed magnetic
surveys conducted by Liberty. The discordant nature of this ultramafic unit
suggests that it is intrusive.
The McWatters mineralized zone can be readily subdivided in two distinct
zones: an upper zone of altered dunitic rocks containing disseminated
sulphides, and a basal, lower zone consisting of massive sulphides. The upper
zone directly overlies the lower zone, which is principally in contact with
wedges of andesitic, footwall volcanic rocks. The two zones combined form
and orebody approximately 150 metres in strike length by 30m to 40m in
width extending down to a depth of approximately 160m. The sulphide
assemblage consists almost exclusively of pyrite and heazlewoodite.
Heazlewoodite (Ni3S2) is one of the most nickel rich sulphide minerals, and is
generally though to be of hydrothermal origin, most often found in dunites and
lherzolites.
**Chapters 6 -8 go into more detailed notes of the geology and mineralization