Ontario Geological Survey
Permanent Link to this Record:
MDI52P15SE00005
| Record Name(s) | NBK Zone - 1987 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1996-Dec-13 |
| Date Last Modified | 2022-Feb-24 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: North Bay Area
Latitude: 51° 46' 44.32" Longitude: -88° 32' 5.02"
UTM Zone: 16 Easting: 394125 Northing: 5737570 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52P15SE
Point Location Description: Trenching
Location Method: Data Compilation
Access Description: Located km Keezhik Lake 45 km northwest of Fort Hope First Nation and 0.75 km northeast of the North Bay of Keezhik Lake. Accessible by float aircraft, then by foot along claim lines or helicopter.
1971: AEM and MAG. - Cominco. 1986-88: AVLF-EM, MAG, EM (max. - min.), ground MAG., IP and geological surveys - by Noramco Exploration Inc. for Severide Resources Inc. Prospecting, stripping, trenching, sampling, and 1 ddh were also conducted. 2004: An exploration program consisting of prospecting, geological mapping, diamond drilling (including 1 DDH totaling 148 m on this showing) 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 | 52P16SW2001 |
| 63.5246 | 52P16SW0002 | 52P16SW0002 |
| 2.10565 | 52P16SW9489 | 52P16SW9489 |
| 2.701 | 52P16SW0018 | 52P16SW0018 |
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Miminiska-Fort Hope
Geological Age: Mesoarchean
Oct 06, 2006 (Mark 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 | Quartz Porphyry | 1 | Quartz |
|---|---|---|---|---|
| Mafic lava flow-unsubdivided | 2 | Flows & Pillows | ||
| Magnetite Ironstone | 3 | Magnetite Iron Formation | Banded | |
| Vein | 4 | Quartz-Ankerite | ||
| Feldspar Porphyry | 5 | Feldspar |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| Sericite | Alteration | Sericitization | 1 | Strong | Disseminated | ||
| Ankerite | Alteration | Carbonatization | 2 | Unknown | Disseminated |
Sep 27, 2019 (Mark Puumala) - The NBK occurrence is located near the contact between mafic volcanics and a quartz porphyry (as shown on compilation map of Arnold and MacTavish 2005). Davis (1988) indicates that the mafic metavolcanics include massive and pillowed flows, and that they are capped by 5 cm to 1 m of lean, cherty banded iron formation. Several smaller bodies of porphyry are also reported to intrude the metavolcanics. A northwest trending fault has been mapped approximately 350 m northeast of this occurrence. Winter (1988) indicates that mineralization occurs at a folded contact between mafic flows and foliated quartz porphyry sills. The gold is associated with east and northeast-trending shears in the mafic flows, north-trending quartz-ankerite veins cutting both rock types, medium to coarse grained pyrite associated with minor folds and banded iron formation, and dilatant zones near folded lithological contacts. The best assay reported by Winter was 3.33 g/t in a surface grab sample of sulphide iron formation. The results of recent drilling of this occurrence (DDH S04-10) by Slam Exploration are reported to include a gold assay of 3.51 ppm over 0.7 m in rock described as fractured iron formation with smoky translucent quartz and semi-massive to massive mm-scale pyrite layers (McKay 2004; Assessment report 52P16SW2001).
Sep 27, 2019 (Therese Pettigrew) - Values in grab samples collected in 1986 range from 0.03 to 1.04 g/t Au in sheared mafic flows and up to 3.33 grams/ton in sulphide iron formation (Assessment report 52P16SW0002).
Dec 07, 2005 (C Salo) - Strongly foliated sericitic matrix in quartz porphyry.
| Rank | Classification |
|---|---|
| 2 | Lode (Gold) |
| 1 | Vein |
| Rank | Characteristic |
|---|---|
| 2 | Sheared |
| 1 | Vein |
Map - Keezhik-Miminiska lakes area, District of Kenora (Patricia Portion), Ontario
Publication Number: ARM48E Scale: 1:63,360 Date: 1997
Author: Prest V.K.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Mineral Occurrences and Prospects in the Fort Hope-Winisk Area
Publication Number: OFR5926 Scale: Date: 1995
Author: Mason J.K., White G.D.
Publisher Name: Ontario Geological Survey
Location:
Part - Geology of the Keezhik-Miminiska lakes area
Publication Number: ARV48-06 Scale: Date: 1998
Author: Prest V.K.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Operation Fort Hope, Lansdowne House-Fort Hope sheet, districts of Kenora (Patricia Portion) and Thunder Bay
Publication Number: P0562 Scale: 1:126,720 Date: 1997
Author: Thurston P.C., Carter M.W.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Operation Fort Hope
Publication Number: MP042 Scale: Date: 1970
Author: Thurston P.C., Carter M.W.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
Map - Fort Hope-Lansdowne House sheet, geological compilation series, Cochrane, Kenora, and Thunder Bay districts
Publication Number: M2237 Scale: 1:253,440 Date: 1972
Author: Thurston P.C., Carter M.W., Riley R.A.
Publisher Name: Ontario Dept. of Mines and Northern Affairs
Location:
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