Ontario Geological Survey
Permanent Link to this Record:
MDI000000001035
| Record Name(s) | Martin Pinksen Zones - 2005 |
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| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2011-Mar-04 |
| Date Last Modified | 2023-Apr-18 |
| Created By | |
| Revised By |
Primary Commodities: Copper
Secondary Commodities: Gold, Silver, Cobalt
Township or Area: Watten
Latitude: 48° 41' 2.54" Longitude: -93° 7' 15.79"
UTM Zone: 15 Easting: 491090.002 Northing: 5392340 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
| Rock Type | Rank | Composition | Texture | Relationship | Gabbro | 1 |
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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
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Pyrite | Economic | Ore |
Mar 04, 2011 (C Ravnaas) - Martin-Pinksen 1, 2, and3 Occurrences are 3 closely-spaced occurrences are located along the southern shoreline of Grassy Portage Bay. They may comprise parts of the same mineralized zone and exhibit a strike length of ~170 m. Occurrences I and 2 consist of rusty, fine to medium-grained, biotitic gabbro to melagabbro containing up to 5% disseminated to blebby chalcopyrite with some pyrrhotite or pyrite. Three of the 5 samples taken from Occurrence 1 contained greater than 1% Cu and graded: 1.81% Cu, 217ppm Co, 4.7ppm Ag, and 473 ppb Au; 3.27% Cu, 197 ppm Co, 8.6 ppm Ag, and 166 0 ppb Au; and 2.89% Cu, 603 ppm Co, 8.8 ppm Ag, 1150 ppb Au, and 1125 ppm As, respectively. One sample was taken from Occurrence 2, 103 m west-southwest of the Occurrence 1, and contained 5150ppm Cu, 1.8ppmAg, and 83 ppb Au. The Occurrence 3, -66 m east-northeast of Occurrence 1, consists of a rusty, medium- to coarse-grained leucogabbro containing 3 to 5% pyrite and some chalcopyrite that graded 4140 ppm Cu, 184ppm Co, and1.3ppm Ag. Reference MetalCORP, Kenora assessment file 52C11NE BBB-3 AFRO 2.32111.
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