Kenogamisis Property
Overview
Covering a total area of 16,660 hectares, the property consists of a contiguous block of patented mining claims, mining leases, mining licenses of occupation and staked mineral claims. Greenstone’s Hardrock open-pit development project is located on the Kenogamisis property as are a number of other high-potential gold exploration targets, including the Little Long Lac, Magnet and Key Lake targets.
Little Long Lac Target
The Little Long Lac target is centered on the historic Little Long Lac gold mine, which was the first mine to be developed in the Geraldton district and was in production between 1934 and 19541. The historic underground mine workings, which extend nearly one kilometer below surface, are located on the southern shore of Kenogamisis Lake just west of Provincial Highway 584.
The gold ore that was recovered from the former Little Long Lac mine was associated with quartz veining that followed a sub-vertical fault zone cutting through Z-shaped folds in a thick bed of arkose. Fractures contained quartz and iron carbonate and were mineralized with gold and pyrite.
The focus of Greenstone Gold Mines’ exploration at Little Long Lac is to target a broad halo of disseminated gold mineralization that surrounds the historically mined, fault-controlled lode gold deposit in the folded sandstone formation and to identify additional zones of higher grade gold mineralization.
Magnet Target
The Magnet gold exploration target is centered on the historic underground workings of the Magnet gold mine, which was in production between 1938 and 19511. The vertical shaft of the former mine is located less than 200 meters north of Trans-Canada Highway 11 and about one kilometer east of the southern end of Magnet Lake.
The gold ore that was recovered from the former Magnet mine mainly consisted of quartz veining that followed a sub-vertical fault zone cutting metamorphosed sand, silt and iron-rich sedimentary rocks. Tectonism caused the beds of the Magnet rock sequence to be sub-vertically inclined with an overall trend of 100 degrees. A regionally extensive fault zone, known as the Bankfield-Tombill Fault, cuts through the rock sequence a few hundred meters south of the mine workings with a trend that is slightly oblique to the sedimentary layering. A number of other smaller faults occur north of, and parallel to, the regional fault. These structures are seen to control the gold-rich quartz veining which formed most of the ore at the Magnet mine.
Future exploration by Greenstone Gold Mines is focussed on discovering gold zones similar in form, orientation and gold mineralization as that shown by the main orebodies historically mined at the Magnet mine.
Key Lake Target
The Key Lake target is situated along the trend of the historical underground workings of the Jellico gold mine, which was in production between 1938 and 19411. The vertical shaft of the former mine is located eleven kilometers due west of the town of Geraldton and about 500 meters north of Trans-Canada Highway 11. Three other gold mines were developed in the area during the late 1930s – the Bankfield, Tombill and Magnet mines.
The gold ore that was recovered from the former Jellico mine mainly consisted of quartz-sulphide veining that followed a planar fracture zone cutting through a sequence of sedimentary rocks. More recent exploration around and on-strike from the former Jellico Mine showed that gold is found both as relatively high-grade mineralization associated with iron sulphide in quartz-carbonate veins and more commonly as minute grains enclosed in disseminated and fracture-controlled sulphide minerals hosted by feldspar-rich sandstone units. The granitic dykes that intrude the folded sandstones are of secondary importance as a host-rock for gold mineralization.
Future exploration by Greenstone Gold Mines at the Key Lake target will focus on the more than two kilometers of prospective ground trending northwestwards from the Jellico mine site to the western limits of the Kenogamisis property.
1 Gold Occurrences, Prospects and Deposits of the Beardmore-Geraldton Area, Districts of Thunder Bay and Cochrane. Ontario Geological Survey Open File Report 5630, Volume 1, by J. Mason and G. White, 1986.
