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Ontario Geological Survey
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MDI52C11NE00032
| Record Name(s) | Mironsky Zone - 1982, Redgut Bay - 9999 |
|---|---|
| Related Record Type | SIMPLE |
| Record Status | Prospect |
| Date Created | 1982-Aug-24 |
| Date Last Modified | 2021-Dec-03 |
| Created By | Q Unknown |
| Revised By | C Ravnaas |
Primary Commodities: Gold, Copper, Silver
Township or Area: Halkirk
Latitude: 48° 42' 7.21" Longitude: -93° 1' 42.75"
UTM Zone: 15 Easting: 497899.999 Northing: 5394330 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52C11NE
Point Location Description: Taken from geology map with occurrences AFRO 2.32111
Location Method: Conversion from MDI
Access Description: The property is access from Highway 11 east of Fort Frances - there is a series of logging roads which provide access to the internal parts of the Grassy Portage intrusive rocks.
There is a long history of base metals exploration within the North Rock area, with the earliest recorded work occurring in 1918, with possible, unrecorded work as early as 1902. Research suggests that there has been little exploration for the platinum group elements (PGE's) and only minor interest in Au. Most of the exploration activity occurred between 1958 and 1978 and was sporadic before or since.2001, 2003 to 2006 as presented in MetalCORP, Kenora assessment file 52C11NE BBB-8 AFRO 2.37249 Two prospecting programs were completed during 2003 and 2004. The property was optioned to MetalCORP Ltd (MTC) during October 2004. During 2005 and 2006 MTC completed an AeroTEM IT helicopter-borne survey, Phase 1 and II diamond drill programs, linecutting, detailed prospecting, and geological mapping.
Mar 02, 2011 (C Ravnaas) - The North Rock Property is primarily underlain by the differentiated Grassy Portage Intrusion (GPI) with lesser amounts of the Grassy Portage ultramafic pyroclastic sequence (GUP); clastic metasedimentary rocks of the Couchiching Metasediments; granitoid rocks of the Bear Passage and Blind Bay plutons; sections of2 formational, composite, chemical/clastic metasedimtmtary sequences; two narrow mafic metavolcanic units; and a few, possibly subvolcanic gabbro sills. All observed rocks-types comprise the southern limb of a large-scale open, antiformal fold cored by the Rice Bay Dome located approximately 1.50 km north of the property (Figure 3). Most rock-types have been regionally metamorphosed to lower amphibolite-grade. The southwestern two-thirds of the Grassy Portage Intrusion underlies the core of the property (~75%). This large, sill-like, mafic complex intrudes all observed supracrustal rock-types, and is composed ofa well-differentiated, locally layered, cumulate sequence of medium- to coarse-grained, melagabbro, gabbro and leucogabbro; coarsely plagiophyric to glomero-plagiophyric gabbro to leucogabbro; localized intervals ofmedium- to coarse-grained anOlthosite; and a discontinuous, noncumulate, ophitic-textured, melagabbroic border phase that is present along both the upper and lower contacts ofthe complex. The intrusion is structurally overturned and stratigraphically south-facing. Cha1copyrite-dominated mineralization concentrates along both upper and lower contacts with the greatest sulphide abundances observed near the basal or northern contact. Reference MetalCORP, Kenora assessment file 52C11NE BBB-8 AFRO 2.37249
Mar 02, 2011 (C Ravnaas) - Most of the presently defined, surface mineralized zones are aligned roughly subparallel to the basal contact of the Grassy Portage Intrusion, are elongate in outline with diffuse margins, and contain highly variable amounts of sulphides with highly variable, but internally consistent, base and precious metals grades associated with a confined range of rock-types. The 2005 prospecting program discovered at least 28 new occurrences and diffuse zones and numerous low-grade showings (not described) from the 489 grab samples Reference MetalCORP, Kenora assessment file 52C11NE BBB-3 AFRO 2.32111 Reference MetalCORP, Kenora assessment file 52C11NE BBB-3 AFRO 2.32111
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Chalcopyrite | Economic | Ore | ||||
| 10 | Pyrite | Economic | Ore | ||||
| 15 | Pyrrhotite | Economic | Ore |
Mar 02, 2011 (C Ravnaas) - This zone was discovered by Mike Hupchuk during the construction of Highway 11 in 1963, approximately 750 m south-southeast of the PH-2 Occurrence. Drilling completed soon after outlined a 250 m long, 10 m thick zone of disseminated to locally stringered and veined chalcopyrite and pyrrhotite within a siliceous schist near the southeastern (upper) contact of the Grassy Portage Intrusion. This quartz-plagioclase schist is in contact with magnetite-apatite amphibolite and quartz gabbro, to the south, and is thought (Poulsen 2000) to represent a very large, recrystallized, xenolithic block of metasedimentary rock. One 1963 drill hole intersected 1.23% Cu over 11.0 m. Harris (1974) estimated that the drilling up to that point in time had outlined -300,000 tons grading 0.80% Cu to a depth of 100 m and over a strike-length of 130 m. MTC sampled the surface exposures of the zone over a strike-length of 200 m and obtained a wide range of low- to high-grade base and precious metals values from 11 of the 13 samples taken. Five of the samples contained between 13100 and 94200 ppm Cu and the other 6 contained between 1625 and 6640 ppm Cu. Silver was the next most consistent metal with 7 samples containing between 1.5 and 25.1 ppm Ag. Analyses of up to 1965ppm Ni, 366ppm Co, 0.362 ppm Au, and 162ppm Mo were also obtained. Reference MetalCORP, Kenora assessment file 52C11NE BBB-3 AFRO 2.32111
Mono - Copper, nickel, lead and zinc deposits of Ontario
Publication Number: MDC012 Scale: Date: 1969
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
MonoMap - Geology of the Rainy Lake area, District of Rainy River
Publication Number: R115 Scale: Date: 1974
Author: Harris F.R.
Publisher Name: Ontario Division of Mines
Mono - The geological setting of mineralization in the Mine Centre-Fort Frances area, District of Rainy River
Publication Number: OFR5512 Scale: Date: 1984
Author: Poulsen K.H.
Publisher Name: Ontario Geological Survey
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