Ontario Geological Survey
Permanent Link to this Record:
MDI000000001036
| Record Name(s) | PH Zones - 2005 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2011-Mar-04 |
| Date Last Modified | 2022-Jul-27 |
| Created By | |
| Revised By |
Primary Commodities: Copper
Secondary Commodities: Gold, Silver, Cobalt
Township or Area: Halkirk
Latitude: 48° 42' 31.98" Longitude: -93° 1' 56.51"
UTM Zone: 15 Easting: 497618.999 Northing: 5395095.001 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) - PH-1 is a new occurrence located adjacent to Highway 11 approximately 65 m southeast of the Highway 1 Occurrence and 50 m northwest of the PH-2 Occurrence. The mineralization consists of 2 to 3% disseminated chalcopyrite within a fine-grained, rusty, weathered gabbro. The single MTC 2005 sample taken contained 15300 ppm Cu, 4.8 ppm Ag, and 0.363 ppm Au. The base and precious metals contents characterizing this occurrence are quite high compared to the total sulphide content of the rock, suggesting a high metal tenor. PH-2 a new occurrence is located 50 m southeast of the PH-l Occurrence and consists of mineralized, medium- to coarse-grained gabbro to melagabbro in contact with mineralized, fine-grained, ophitic-textured melagabbro (microgabbro) occurring near the upper (southeastern) contact of the Grassy Portage Intrusion. The fine-grained, ophitic melagabbro represents the upper, non-cumulate border phase of the intrusion. The coarser-grained gabbros hosts 2 to 7% disseminated chalcopyrite, pyrrhotite, and pyrite that contained up to 3230ppm Cu and 1.2ppm Ag. The finer-grained melagabbros contain 1 to 15% disseminated and stringered chalcopyrite and pyrrhotite that graded up to 8410 ppm Cu, 568 ppm Co, and 2.0 ppmAg. Highway 2 is located 60 m north of the PH-l Occurrence. At present is consists of a single 2005 MTC grab sample composed of medium- to coarse-grained, slightly rusty gabbro containing 20 to 25 % chalcopyrite and grading 20200 ppm Cu, 7.0 ppm Ag, and 0.297ppm Au. Reference MetalCORP, Kenora assessment file 52C11NE BBB-2 AFRO 2.30919
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Kenora Resident Geologist District Office