Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000000156| Deposit Name(s) | S04-12 - 2004 |
|---|---|
| Deposit Status | occurrence |
| Date Created | 2006-Oct-10 |
| Date Last Modified | 2020-May-01 |
| Created By | M A Puumala |
| Revised By | T Pettigrew |
Primary Commodities: gold
Township or Area: North Bay Area
Latitude: 51° 46' 27.64" Longitude: -88° 30' 43.31"
UTM Zone: 16 Easting: 395680 Northing: 5737022 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52P15SE
Point Location Description: Diamond drill hole location from Assessment report 52P16SW2001
Location Method: data compilation
1987: Noramco Explorations Inc. carried out mapping and ground magnetometer, VLF-EM, HLEM, and IP surveys. 2004: An exploration program consisting of prospecting, geological mapping, diamond drilling (including 1 DDH totalling 128 m on this occurrence) and assaying was carried out by Slam Exploration on claims owned by William E. Brereton.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.28485 | 52P16SW2001 | Open |
| 63.5246 | 52P16SW0002 | Open |
Province: Superior
Subprovince: Uchi
Belt: Miminiska-fort Hope
Geological Age: Mesoarchean
Tectonic Assemblage: Unnamed Assemblage Equivalent To Pickle Crow.
10/10/2006 (M A Puumala) - The Keezhik Lake area gold occurrences are located within the northern portions of the Miminiska-Fort Hope Greenstone Belt. This portion of the belt has been interpreted by Stott and Corfu (1991) to be underlain by the rocks of three separate supracrustal rock assemblages. The northernmost assemblage is dominated by mafic volcanic flows containing a banded iron formation marker unit. This assemblage is interpreted to be overlain by a southward facing sequence of massive to pillowed mafic volcanics that also contains a well-defined iron formation marker unit. A third assemblage consisting of mafic volcanics, felsic pyroclastic rocks and a quartz porphyry intrusion overlies the second unnamed assemblage. The Keezhik Lake gold occurrences are located near the boundary between the second and third assemblages. A wide variety of lithologies have been mapped in this area, including mafic metavolcanics, mafic to ultramafic intrusive rocks (gabbro and pyroxenite), banded iron formation, intermediate to felsic pyroclastic rocks with thin interbedded sedimentary layers, and quartz/quartz-feldspar porphyry intrusions (Arnold and MacTavish, 2005). Gold occurrences appear to be hosted within all of these lithologies, with the most significant known occurrence (KL-12) being found in a quartz porphyry stock. The Keezhik Lake gold occurrences are located in close proximity to the North Caribou Lake-Totogan Lake Shear Zone. This is a major regional-scale structure that may have provided a source of gold-mineralized fluids. Osmani and Stott (1988) identified this area as having significant gold potential, especially where splays or horse-tail shear zones may have transmitted fault movement into the greenstone belt. Lithological contacts with competent units such as porphyry intrusions and iron formations (i.e., the setting for many of the known occurrences) are considered to be favourable locations for the development of significant gold mineralized structures.
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| vein | 1 | quartz vein | host | |
| porphyry | 2 | adjacent | ||
| iron formation | 2 | adjacent | ||
| mafic metavolcanics | 3 | near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | pyrite | economic | ore | ||||
| 2 | chalcopyrite | economic | ore | ||||
| 3 | gold | economic | ore |
10/10/2006 (M A Puumala) - Anomalous gold mineralization was reported by McKay (2004) in a diamond drill hole (S04-12) that was advanced to evaluate a soil geochemical anomaly. The drill hole encountered a sequence consisting of mafic metavolcanics, iron formation and quartz porphyry. The anomalous gold value (1.28 ppm over 0.9 m) was obtained at the contact between iron formation and quartz porphyry. The mineralized zone is located within the iron formation and contains transparent and transluscent quartz veins and knots containing pyrite and chalcopyrite. Bedding is reported to be distorted and crenulated, with numerous perpendicular quartz-filled fractures.
| Rank | Classification |
|---|---|
| 1 | vein |
| 2 | lode (gold) |
| Rank | Characteristic |
|---|---|
| 1 | vein |
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