Ontario Geological Survey
Permanent Link to this Record:
MDI000000001031
| Record Name(s) | Highway 1 - 2005 |
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| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2011-Mar-04 |
| Date Last Modified | 2022-Jul-27 |
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| Revised By |
Primary Commodities: Copper, Nickel
Township or Area: Halkirk
Latitude: 48° 43' .96" Longitude: -93° 2' 13.76"
UTM Zone: 15 Easting: 497267.001 Northing: 5395989.997 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52C11NE
Point Location Description: Taken from geology map with occurrences AFRO 2.32111.
Location Method: Data Compilation
Access Description: The property is accessed 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 04, 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 04, 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
Mar 04, 2011 (C Ravnaas) - This zone consists of a 100 m long sequence of at least 3 sulphide occurrences exposed within the rock cuts of Highway II, Much of the mineralization observed by MTC in 2005 occurs within fine-grained mafic rocks comprising both amphibolitized mafic metavolcanic flows and fine-grained, ophitic, non-cumulate: melagabbro of the basal border phase of the Grassy Portage Intrusion. Mineralization consists of I to 30% fracture-controlled stringers, veinlets and veins and associated blebby and disseminated chalcopyrite and pyrrhotite. Analyses of MTC 2005 grab samples obtained up to 23600ppm Cu, 420 ppm Ni, 11.0ppm Ag, 488 ppm Mo, 0.853 ppm Au, and 190ppm Co. Reference MetalCORP, Kenora assessment file 52C11NE BBB-2 AFRO 2.30919.
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