Ontario Geological Survey
Permanent Link to this Record:
MDI42D14NE00013
| Record Name(s) | Waterfall Vein - 1990 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1997-Feb-07 |
| Date Last Modified | 2022-May-06 |
| Created By | |
| Revised By |
Primary Commodities: Molybdenum, Copper
Secondary Commodities: Gold
Township or Area: Lower Aguasabon Lake Area
Latitude: 48° 58' 21.19" Longitude: -87° 1' 29.19"
UTM Zone: 16 Easting: 498187 Northing: 5424405 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D14NE
Point Location Description: Map in Assessment report 42D15NW0002
Location Method: Data Compilation
Access Description: The vein is located on the west shore of Owl Lake, approximately 3 km north of the lake's southern shore. It outcrops along a small creek, 200 m west of the lakeshore. Numerous angular blocks of quartz vein material up to 1 m in size occur in the creek bed. The vein is exposed on both sides of the creek and forms a 2 m high waterfall. Access to Owl Lake may be gained via old bush roads extending off the Kimberly-Clark forest access road north of Terrace Bay towards the Aguasabon River.
The occurrence was discovered and staked by prospectors David and Erik Christianson in the summer of 1990.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63.5720 | 42D15NW0002 | 42D15NW0002 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
Dec 07, 2005 (B Nelson) - The occurrence is classed as a 'calc-alkalic porphyry' deposit. The vein is hosted by a medium-grained, massive, folated grey granodiorite which has locally developed, orthogonal joints. The contact zones are dark black, sulphide and hornblende-rich and non-magnetic. The vein itself consists of milky white to grey quartz, locally mineralized with subhedral pyrite and chalcopyrite aggregates. It apparently strikes northeast and dips shallowly to the northwest. Smaller quartz stringers up to 2 cm in width occur in some areas. The main vein has been traced in outcrop for over 25 m along strike and attains a width of perhaps 10 m. Approximately 100 m further upstream to the west, a variety of weakly foliated, medium-grained, magnetic gabbroic rocks and fine-grained amphibolite are intruded by fine-grained granitic dykes and small quartz veins. Where foliated and intercalated rocks outcrop, the foliation strikes at approximately 30 degrees and dips 20 degrees to 40 degrees to the northwest. Quartz veins and granitic rocks are locally mineralized with minor molybdenite.
| Rock Type | Rank | Composition | Texture | Relationship | Granodiorite | 1 | Host |
|---|---|---|---|---|
| Vein | 2 | Quartz | Host | |
| Gabbro | 3 | Gabbro | Near |
Dec 07, 2005 (B Nelson) - The granodiorite is grey, medium-grained, massive and foliated. It has locally developed, orthogonal joints. The contact zones are dark black, sulphide and hornblende-rich and non-magnetic.
Jun 14, 2019 (Therese Pettigrew) - The vein is located on the west shore of Owl Lake, approximately 3 km north of the lake' s southern shore. It outcrops along a small creek, 200 m west of the lakeshore. Numerous angular blocks of quartz vein material about 1 m in size occur in the creek bed. The vein is exposed on both sides of the creek and forms a 2 m high waterfall. The vein is hosted by a medium-grained, massive, foliated grey granodiorite which has locally developed, orthogonal joints. The contact zones are dark black, sulphide-and hornblende-rich and non-magnetic. The vein itself consists of milky white to grey quartz, locally mineralized with subhedral pyrite chalcopyrite aggregates. It apparently strikes northeast and dips shallowly to the northwest. Smaller quartz stringers about 2 cm occur in some areas. The main vein has been traced in outcrop for over 25 m along strike and attains a width of perhaps 10 m. Approximately 100 m further upstream to the west, a variety of, weakly foliated, medium-grained, magnetic gabbroic rocks and fine-grained amphibolite are intruded by fine-grained granitic dykes and small quartz veins. Where foliated and intercalated rocks outcrop, the foliation strikes at approximately 30 degrees and dips 20 to 40 degrees to the northwest. Quartz veins and granitic rocks are locally mineralized with minor molybdenite (Assessment report 42D15NW0002; M. Smyk field notes in RGP Mineral Deposit files).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Molybdenite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 3 | Chalcopyrite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 | Unknown | Disseminated |
Dec 07, 2005 (B Nelson) - Sampling by Resident Geologist's staff returned the following assays: 90 BWV-01: nil Au; 0.257% Cu; nil Mo 90 BWV-08: trace Au; 0.030% Cu; 0.172% Mo 90 BWV-12: 0.003 oz/t Au; 0.034% Cu The best gold value was obtained from a sugary to glassy, 'crack seal' textured quartz vein with seams of pyrite. The best Copper value was obtained from massive pyrite + quartz veinlets in granodiorite. The best Molybdenum value was obtained from medium grained granodiorite with disseminated grains of pyrite and flakes of molybdenite. The best Nickel value was obtained from massive melagabbro with disseminated pyrite.
Date: Feb 07, 1997
Geologist: B Nelson
Notes: Resident Geologist staff visited the occurrence July 31, 1990.
File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files, Thunder Bay office
Publication Number: Min Dep Date:
Author:
Publisher Name:
Location: Thunder Bay RGP
Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District
Publication Number: M2232 Scale: 1:253,440 Date: 1973
Author: Carter M.W., McIlwaine W.H., Wisbey P.A.
Publisher Name: Ontario Division of Mines
Location:
Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.
Publication Number: OFR5951 Page: 136-168 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
Map - Cairngorm Lake area, Thunder Bay District
Publication Number: M2112 Scale: 1:31,680 Date: 1997
Author: Walker J.W.R.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Big Duck-Aguasabon lakes area, District of Thunder Bay, Ontario
Publication Number: ARM49K Scale: 1:31,680 Date: 1997
Author: Bartley M.W.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Geological series, Precambrian geology of the Terrace Bay area, northeast sheet, Thunder Bay District
Publication Number: P2557 Scale: 1:15,840 Date: 1982
Author: Carter M.W.
Publisher Name: Ontario Geological Survey
Location:
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For detailed information regarding this mineral record please contact the Thunder Bay South Resident Geologist District Office