Re: Green belt area plays ACA HOWE 2000
in response to
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posted on
Sep 13, 2009 04:46PM
Focused on the Rice Lake Gold Belt
The Manigotagen Gneissic Belt, which lies immediately south of the Rice Lake greenstone belt, represents a lithologic gradation from the low-grade metavolcanic and metasedimentary rocks through paragneiss and migmatite to quartz dioritic and granodioritic gneiss. There are at least three and possibly four major periods of deformation in the Rice Lake area (Sasseville, 1999). The resulting fold pattern is complex with overturned, doubly plunging folds common in the Rice Lake Group rocks. The late Archean San Antonio Formation sedimentary rocks may have only been affected by the last major period of deformation. There are a number of major regional fault structures in the Rice Lake area. The major structures that trend in a generally east-west direction are the most prominent and movement along these structures has developed conjugate shear zones that splay off to the north and south. In addition there has probably been thrust faulting in the early stages of the deformation of the area, however, these structures are difficult to identify. All of the major gold occurrences in the Rice Lake area occur as quartz veins or quartz vein systems related to structural deformation (folding and faulting) of the host rocks. See Section 4.2 for a discussion of deposit types/models and Section 4.3 for descriptions of the geology and mineralization on the Bissett Mine property. The Uchi Subprovince has significant gold production from the Rice Lake, Manitoba area in the west through the Red Lake, Birch-Uchi Lake, to Pickle Lake-Dona Lake areas of Ontario. Gold production from the area is summarized in Table 4.3.