Ontario Geological Survey
Permanent Link to this Record:
MDI000000001040
Record Name(s) | Trail Zones - 2005 |
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Record Status | Occurrence |
Date Created | 2011-Mar-04 |
Date Last Modified | 2022-Jul-27 |
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Revised By |
Primary Commodities: Copper, Platinum
Secondary Commodities: Palladium
Township or Area: Halkirk
Latitude: 48° 42' 20.8" Longitude: -93° 2' 19.94"
UTM Zone: 15 Easting: 497139.999 Northing: 5394749.996 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) - The Trail Occurrence is located 140 m south-southwest of the Bjorkman East float boulder and was discovered by MTC prospecting during 2004. Mineralization consists of 5% disseminated chalcopyrite within coarse-grained, rusty gabbro or melagabbro. The single sample taken graded 3720 Cu, 1.28 ppm Pt, and 0.213 ppm Pd. The Bjorkman East Float a mineralized, fine-grained mafic (melagabbro) float boulder was discovered by MetalCORP prospecting in 2003. The boulder contains an unspecified amount of chalcopyrite and pyrrhotite that graded 5163 ppm Cu, 1279 ppm Ni, 152 ppm Co. 144 ppb Pt, and 291 ppb Pd. Reference MetalCORP, Kenora assessment file 52C11NE BBB-2 AFRO 2.30919. The T 9 North is an isolated occurrence, located 440 m east of the Trail and Bkorkman Float consists of a single sample taken in 2003 and described as a mafic, non-magnetic rock (possibly a float boulder) containing 1% blebby pyrite with fine pods (blebs?) of chalcopyrite. The sample contained 2943 ppm Cu, 1129 ppm Ni, and 247ppb Pd. Reference MetalCORP, Kenora assessment file 52C11NE BBB-3 AFRO 2.3111.
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