Ontario Geological Survey
Permanent Link to this Record:
MDI52H09NE00023
| Record Name(s) | P.E. Hopkins - 1959, Montgomery - 1935 |
|---|---|
| Related Record Type | Partial |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1991-Jan-21 |
| Date Last Modified | 2022-May-09 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Secondary Commodities: Copper, Molybdenum, Arsenic
Township or Area: Dorothea
Latitude: 49° 40' 38.89" Longitude: -88° 5' 1.11"
UTM Zone: 16 Easting: 421821 Northing: 5503335 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52H09NE
Point Location Description: Sample 20086 from Assessment report 20000014168
Location Method: Data Compilation
1935: Gold was discovered by T. Montgomery of Montmorr Gold Mines Ltd. 1959: P.E. Hopkins carried out prospecting, stripping, and trenching, and drilled 13 DDH totaling 390 m. 1971: Gunnex Ltd. conducted magnetic and VLF-EM surveys, geological mapping and soil sampling. 1988: Glen Auden Resources drilled 6 DDH totaling 891 m. 2016: H.G. Goodman and M. Goodman carried out prospecting, stripping and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 63A.368 | 52H09NE0021 | 52H09NE0021 |
| 14 | 52H09NE0007 | 52H09NE0007 |
| 2.56776 | 20000014168 | 20000014168 |
| 2.57205 | 20000014169 | 20000014169 |
| 2.1896 | 52H09NE0018 | 52H09NE0018 |
| 63.4128 | 52H09NE0012 | 52H09NE0012 |
Province: Superior
Subprovince: Wabigoon
Belt: Beardmore-Geraldton
Geological Age: Archean
| Rock Type | Rank | Composition | Texture | Relationship | Vein | 1 | Quartz | Host |
|---|---|---|---|---|
| Diorite | 2 | Diorite | Host | |
| Intermediate lava flow-unsubdivided | 3 |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Pyrite | Economic | Ore | ||||
| 2 | Chalcopyrite | Economic | Ore | ||||
| 3 | Arsenopyrite | Economic | Ore | ||||
| 4 | Molybdenite | Economic | Ore |
Sep 30, 2019 (Therese Pettigrew) - Gold and molybdenite occur in quartz veins and in the adjacent schist of the wallrock. The quartz veins are mostly in altered diorite or near it in altered rhyolite, but gold values have also been obtained in sulphide seams and in veinlets in granite porphyry. The gold in the quartz veins in altered diorite is associated with fine-grained arsenopyrite and some pyrite. The veins are narrow and lenticular, the greatest widths being about 5 feet. They strike NE and NW and dip steeply from 70 degrees to vertical (Assessment report 52H09NE0021). The holes drilled by Glen Auden in 1988 intersected mafic to intermediate flows and breccias intruded by quartz diorite, feldspar and quartz-feldspar porphyry dikes. Rocks are sericitized and carbonatized and are cut by quartz and quartz-carbonate veins and stringers. Some diamond-drill sections contained trace to 1% fine-grained disseminated pyrite, and most assays were reported to be less than 500 ppb Au. The best assay was obtained from drill hole DDH-4, which returned 8.0 g/t Au and 8100 ppm As over a 0.6 m section containing a 12.7 cm wide quartz vein in a quartz diorite with trace pyrite. Hole DDH-3 intersected 2.3 g/t Au over 0.7 m in a strongly sericitized, altered quartz-feldspar porphyry cut by a 5 cm quartz-carbonate vein (Hart et al., 2002). Sampling by the Goodmans returned sample values up to 37.6 and 43.7 g/t Au from sulphide-bearing quartz veins. Association of arsenopyrite with the quartz vein and altered mafic volcanic wallrock produced the best gold values (Assessment report 20000014168).
Map - Dorothea, Sandra and Irwin townships, Thunder Bay District
Publication Number: M2294 Scale: 1:31,680 Date: 1974
Author: Mackasey W.O.
Publisher Name: Ontario Division of Mines
Location:
MonoMap - Geology of Dorothea, Sandra, and Irwin townships, District of Thunder Bay
Publication Number: R122 Date: 1975
Author: Mackasey W.O.
Publisher Name: Ontario Division of Mines
Location:
File - Resident Geologist Mineral Deposit Files
Publication Number: Min Dep Date: 1996
Author:
Publisher Name:
Location: Thunder Bay RGP
MonoMap - Precambrian Geology of Kitto, Eva, Summers, Dorothea and Sandra Townships, Northwestern Ontario: Phoenix Bedrock Mapping Project
Publication Number: OFR6095 Page: 133 Date: 2002
Author: Hart T.R., ter Meer M., Jolette C.
Publisher Name: Ontario Geological Survey
Location:
Folio - Poplar Point area (Dorothea Township), District of Thunder Bay
Publication Number: GDIF186 Date: 1997
Author: Thunder Bay RGO
Publisher Name: Ontario Geological Survey
Location:
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