Ontario Geological Survey
Permanent Link to this Record:
MDI53C13SE00075
| Record Name(s) | North Rock 1968 - 1968 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1984-Jan-31 |
| Date Last Modified | 2022-May-31 |
| Created By | |
| Revised By |
Primary Commodities: Gold, Copper
Secondary Commodities: Iron
Township or Area: Setting Net Lake Area
Latitude: 52° 51' 55.22" Longitude: -93° 37' 48.69"
UTM Zone: 15 Easting: 457576.43 Northing: 5857476.67 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 53C13SE
Point Location Description: General
Location Method: Data Compilation
Access Description: 200 KM N Red Lake
1965-1968: Geophysical surveys and diamond drilling (2 drill holes) by North Rock Explorations. 1982: Prospecting and geological mapping by Getty Canadian Metals. 2007: Anaconda Gold Corp. conducted a prospecting program.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.37754 | 20000002839 | 20000002839 |
| 53C13SE0500 | 20000004850 | 20000004850 |
| 20 | 53C13SE0060 | 53C13SE0060 |
| 2.1748 | 53C13SE0508 | 53C13SE0508 |
| 2.1164 | 53C13NE0070 | 53C13NE0070 |
Province: Superior
Subprovince: Sachigo
Terrane: North Caribou
Belt: Favourable Lake
Geological Age: Mesoarchean
| Rock Type | Rank | Composition | Texture | Relationship | Chert | 1 | Adjacent |
|---|---|---|---|---|
| Ironstone-unsubdivided | 2 | Host | ||
| Claystone | 3 | Argillite | Adjacent | |
| Intermediate Tuff | 4 | Tuff | Near | |
| Gabbro | 5 | South Trout Lake Sill | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Arsenopyrite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Gold | Economic | Ore | ||||
| 4 | Pyrite | Economic | Ore | ||||
| 5 | Pyrrhotite | Economic | Ore |
Oct 24, 2007 (Mark Puumala) - The North Rock 1968 occurrence is described by Ayres (1974) as an iron formation and ferruginous chert unit that is mineralized with arsenopyrite, pyrrhotite, pyrite and rare chalcopyrite. This mineralized iron formation does not outcrop, but was intersected by two diamond drill holes advanced by North Rock Exploration in 1968 (ddh Nos. 1 and 2). Ayres (1974) reported that the iron formation/ferruginous chert forms a single metasedimentary unit that contains up to 30% interlayered slate and argillite, and is hosted within intermediate metavolcanics (tuff). Ayres (1974) indicates that the iron formation strikes approximately east, and has interpreted that the thickness of the mineralized iron formation unit averages approximately 45 m. However, the iron formation becomes thicker to the east (apparent thickness of approximately 100 m in ddh No. 2), where it has likely been deformed by the intrusion of the South Trout Lake metagabbro sill. Ayres (1974) describes the iron formation as being composed of chert and iron silicate with localized layers of magnetite and pyrrhotite. The pyrrhotite mineralization consists of variable thickness layers (<1 to 5 mm) that locally comprise up to 15% of the iron formation. Discordant pyrrhotite veinlets are also reported to occur within chert layers. Other sulphide minerals noted by Ayres (1974) in the iron formation include pyrite, chalcopyrite and arsenopyrite. Pyrite is reported to occur locally in association with pyrrhotite in concentrations of up to 3%. Arsenopyrite is found in some iron formation layers at concentrations of up to 25%, and is reported to occur as disseminated grains and layers up to 1 cm thick at some contacts between chert and iron silicate. Only rare chalcopyrite is reported to occur in the iron formation. Ayres also reports the occurrence of sulphide mineralization in the argillite/slate. Pyrrhotite (2 to 15%) is reported to occur as concordant layers up to 1 cm thick. Irregular veinlets of pyrite comprise trace to 3% of the argillite/slate, while chalcopyrite was locally observed in association with narrow bedding-parallel veinlets. The argillite/slate is also reported by (Ayres) 1974) to exhibit localized evidence of small-scale folding and brecciation. The brecciated material contains a pyrrhotite matrix. Ayres (1974) reports gold assay values of up to 0.03 oz/ton (0.93 g/t Au) over 0.6 m in ddh No. 2. All of the reported anomalous gold assays are associated with arsenopyrite-bearing iron formation.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Stratabound |
Book - AFRO 1973,75, #2.1164, 2.1748
Publication Number: N/A Date: 1996
Author:
Publisher Name:
Location:
Book - AFRO 1981, #2.4602
Publication Number: N/A Date: 1996
Author:
Publisher Name:
Location:
MonoMap - Geology of the Trout Lakes area, District of Kenora (Patricia Portion)
Publication Number: R113 Page: 131-134 Date: 1974
Author: Ayres L.D.
Publisher Name: Ontario Division of Mines
Location:
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