Ontario Geological Survey
Permanent Link to this Record:
MDI52C11NE00049
Record Name(s) | Belacoma South - 1991 |
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Related Record Type | Simple |
Related Record(s) | |
Record Status | Occurrence |
Date Created | 1991-Mar-01 |
Date Last Modified | 2022-Jul-12 |
Created By | |
Revised By |
Primary Commodities: Copper, Platinum, Palladium, Nickel
Township or Area: Halkirk
Latitude: 48° 43' 11.65" Longitude: -93° 1' 54.04"
UTM Zone: 15 Easting: 497669.997 Northing: 5396320.004 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.
Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
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2.1763 / 52C11NE B-6 | 52C11NE0048 | 52C11NE0048 |
Mar 03, 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 03, 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
Mar 03, 2011 (C Ravnaas) - This occurrence occurs near the base of the Grassy Portage Intrusion and is exposed by several large blast trenches and consists of medium- to coarse-grained gabbro containing 2 to 15%, locally up to 50% disseminated, blebby, and stringered pyrrhotite and some chalcopyrite. MTC 2005 samples contained up to 1970 ppm Cu and 1235 ppm Ni. The Cousineau Showing a new occurrence is located approximately 130 m southwest of the Belacoma South Occurrence and may be part of the same mineralized zone. Mineralization consists of I to 5% disseminated chalcopyrite and pyrrhotite within fine-grained gabbro and melagabbro at the base of the Grassy Portage Intrusion. MTC 2005 sampling obtained up to 5620 ppm Cu, 764 ppm Ni, 0.805 ppm Pd, 0.688 ppm Pt, and 0.160 ppm Au. The L134E showing an previously undocumented historic occurrence is located about 90 to 115 m east of the Cousineau Occurrence and 200 m south-southeast of the Belacoma South Occurrence. It consists of2 old blast trenches, spaced about 25 m apart, that exposed medium- to coarse grained pyroxenite in the eastern trench and coarse-grained gabbro in the western trench. The rocks within both trenches contained 1 to 2% disseminated chalcopyrite and pyrrhotite and graded 2550ppm Cu, 966ppm Ni, and 0.142 ppm Pd and 1455 ppm Cu, 0.243 ppm Pt, and 0.246 ppm Pt, respectively. Reference MetalCORP, Kenora assessment file 52C11NE BBB-3 AFRO 2.32111
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