Local Geology

The oldest assemblage of rocks in the Red Lake area is the Balmer assemblage (2860-2840 Ma), which is generally comprised of primarily massive tholeiitic basalts with minor felsic volcaniclastic rocks and metasedimentary rocks (Stott and Corfu, 1991). This assemblage is unconformably overlain by the younger Confederation assemblage (2742-2732 Ma), which generally is comprised of intermediate pyroclastics with minor rhyolitic flows and tuffs built on a sequence of mafic to intermediate pillowed flows (Stott and Corfu, 1991). Outcrop exposure becomes diminished eastward as the blanket of glacial overburden increases and topography flattens; best exposures are found on lakeshores and riverbanks. The generally flat topography of the Uchi Subprovince is interrupted by low glacial moraines, eskers, drumlins which are elongated to the southwest.

Map of the Superior Province of the Canadian Shield showing the subprovinces.
The Uchi Subprovince is highlighted in black and the red star indicates the location of the Dome property. Modified from Leonard (2007).

The key features of lode gold deposits in the Red Lake belt can be summarized by the following generalizations (Sanborn-Barrie et al., 2000; Gosselin and Dubé, 2005):

  1. Gold mineralization is generally within the older Balmer Assemblage rocks.
  2. Gold mineralization is generally localized along discreet structures within these rocks.
  3. Gold mineralization occurs in proximity to a belt scale unconformity separating Neo- and Mesoarchean rocks (older Balmer assemblage rocks and younger Confederation assemblage rocks). This applies to late granitic rocks that have intruded in or near this unconformity (e.g. Red Lake Gold Shore mine). There is an inferred northeast trend to the unconformity, which appears to project into mining claim 1234522 (Sanborn-Barrie et. al. 2004)
  4. Gold mineralization is associated with large areas of ferroan-dolomite alteration. The areas reflecting this alteration are particularly evident in the mafic-ultramafic rocks of the Balmer Assemblage and may be much more subtle and localized in more felsic assemblages.

    Silicification in the form of extension and fault-filled veins, ‘jigsaw puzzle’ breccia veins and open space fillings is associated with gold mineralization. Gold bearing silicification typicallycontains arsenopyrite and other sulfide minerals. It should be pointed out that these features apply primarily to the known gold deposits in the belt.

The Red Lake Mining Camp has a long history of gold exploration, discovery and production. The area comprising and surrounding the Property is no exception, with seven gold occurrences, four discretionary gold occurrences and two past gold producers situated in the immediate region of the Property (Figure 4-2 and Table 7-1). The following offers a brief summary of some of the more significant gold occurrences and past producers which are hosted by similar geology (quartz diorite intrusive – Howey Diorite) that underlies the Property.

Table 7-1: Gold occurrence within and proximal to the Dome Property (http://www.mndm.gov.on.ca/mines).

Township Name Primary Metal Status
Dome McManus #1 Vein Gold OC
Dome McManus #5 Vein Gold OC
Dome McManus Mines Shear Zone Gold OC
Dome McManus Mines Quartz Vein #2 Gold DO
Byshe Peterson (North) Gold OC
Balmer Laddie-Macfie Prospect Gold P
Balmer Laddie Gold Mines – Goldquest Gold OC
Balmer Peterson #2 Showing Gold OC

OC = occurrence; DO = discretionary occurrence; P = prospect

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