REGIONAL GEOLOGY

The Moss Lake Property is underlain by Archean rocks of the Wawa and Quetico subprovinces. The supracrustal rocks which form part of the Shebandowan greenstone belt (SGB) of the Wawa Subprovince, occur in the southeast half of Moss Township. The SGB is composed of three mafic to intermediate metavolcanic sequences (northern, central and southern) and an intermediate to felsic central metavolcanic sequence. The mafic to intermediate northern, central and southern sequences consist of massive and pillowed flows and fragmental rocks (pillow breccia, tuff, lapilli tuff breccia). The central intermediate to felsic metavolcanic sequence consists of massive (fine grained to aphanitic) porphyritic and autobrecciated flows and other fragmental rocks (tuff, lapilli tuff and pyroclastic breccia). Ironstone unites form a relatively minor yet widely distributed component in mafic to intermediate metavolcanic successions and, in some cases, they occur at the interface between the mafic and felsic metavolcanic units. The Quetico Metasedimentary Belt (QSB) occupies the northwestern half of the township and consists of massive to thinly bedded metawacke and minor thinly bedded to finely laminated metasiltstone.

Intruding the SGB and QSB are large and small sills, dike and stock-like bodies of gabbro, diorite, feldspar and quartz-feldspar porphyries, as well as four relatively late composite granitoid stocks: the Moss Lake, Hood Lake, Hermia Lake and Obadinaw.

The regional metamorphic grade is lower greenschist facies except for in close proximity to the large granitoid stocks where metamorphism increases to upper greenschist/amphibolite facies.

Gold is regionally associated with sulphides and occurs in the following associations:

1) Quartz carbonate veins emplaced along subparallel sets of northeast and east-northeast striking ductile shear zones

2) Along mineralized, ductile to brittle shear zones and associated fractures in central intermediate to felsic metavolcanic units, and in diorite to gabbro and feldspar porphyry bodies emplaced within intermediate to felsic metavolcanic rocks

3) Deformed (folded and/or sheared) sulphide-bearing ironstone units

 

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