Ontario Geological Survey
Permanent Link to this Record:
MDI52C11NE00038
| Record Name(s) | Swell Bay Occurrence - 1984, Hupchuck - 9999, Traverse Inlet Prospect - 9999, Swell Bay Property - 9999 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1984-Feb-17 |
| Date Last Modified | 2022-May-10 |
| Created By | |
| Revised By |
Primary Commodities: Copper, Zinc
Township or Area: Halkirk
Latitude: 48° 41' 13.77" Longitude: -93° 3' 16.48"
UTM Zone: 15 Easting: 495983.056 Northing: 5392680.95 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.
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
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Chalcopyrite | Economic | Ore | ||||
| 10 | Pyrrhotite | Economic | Ore | ||||
| 15 | Sphalerite | Economic | Ore |
Mar 03, 2011 (C Ravnaas) - The Traverse Inlet Occurrence is located 1575 m east-southeast of the Beaver Pond Zone and 800 m north-northwest of Traverse Inlet, Rainy Lake, near the southern (upper) contact of the Grassy Portage Intrusion. On surface the rocks overlying the occurrence are the fine-grained, ophitic-textured melagabbro that comprises the discontinuous, upper, non cumulate border phase of the intrusion. One of two diamond drill holes completed by M. Hupchuk and G. Armstrong in 1968 intersected 30 ft (9.1 m) containing up to 10% disseminated pyrrhotite, chalcopyrite, and sphalerite, within an undisclosed rock-type, that graded 2.53% Zn and 0.11% CU/10ft (3.05 m) (Harris 1974). A 28 ft (8.53 m) interval within the second hole (drilled at 1800 to the first) contained some pyrrhotite, chalcopyrite, and sphalerite, but no assays are available. Poulsen (2000) notes that sphalerite veins up to 10 em thick were present within quartz diorite and was probably related to assimilate metavolcanic xenoliths. Reference MetalCORP, Kenora assessment file 52C11NE BBB-3 AFRO 2.32111
Mono - Copper, nickel, lead and zinc deposits of Ontario
Publication Number: MDC012 Page: 225 Date: 1969
Author: Shklanka R.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Geology of the Rainy Lake area, District of Rainy River
Publication Number: R115 Page: 53 Date: 1974
Author: Harris F.R.
Publisher Name: Ontario Division of Mines
Location:
Mono - The geological setting of mineralization in the Mine Centre-Fort Frances area, District of Rainy River
Publication Number: OFR5512 Page: No. 73 Date: 1984
Author: Poulsen K.H.
Publisher Name: Ontario Geological Survey
Location:
File - Mineral Deposit Files Kenora
Publication Number: Date:
Author:
Publisher Name:
Location:
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