Ontario Geological Survey
Permanent Link to this Record:
MDI42D14NW00020
| Record Name(s) | Quartz Stockwork - 1964 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1991-Mar-27 |
| Date Last Modified | 2022-May-06 |
| Created By | |
| Revised By |
Primary Commodities: Copper
Township or Area: Pays Plat Lake Area
Latitude: 48° 59' .66" Longitude: -87° 16' 45.21"
UTM Zone: 16 Easting: 479570 Northing: 5425661 UTM Datum: NAD83
Resident Geologist District: Thunder Bay South
NTS Grid: 42D14NW
Point Location Description: BD-2 location from Assessment report 42D14NW2003
Location Method: Data Compilation
Access Description: The occurrence is approximately 1 km directly south of where Big Duck Creek flows out of the southwest bay of Big Duck Lake 27 km north of Schreiber (claim map G-606, Pays Plat). Access is via aircraft to Big Duck Lake then by boat to the southwest bay of the lake, then by foot following Big Duck Creek for 0.4 km to the showing. Access to Big Duck Lake can be attained by a drill trail from the Winston Lake Mine site.
1964: The deposit consists of a network of quartz veins described by Pye (Map 2023). 2003: Elgin Lake Mines Ltd. carried out prospecting and soil sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.25968 | 42D14NW2003 | 42D14NW2003 |
Province: Superior
Subprovince: Wawa
Terrane: Wawa-Abitibi
Belt: Schreiber-Hemlo
Geological Age: Archean
Dec 07, 2005 (B Nelson) - The geology consists of a quartz porphyry dyke or sill intruding into either gabbro or a coarse-grained mafic metavolcanic flow. Abundant quartz veins were observed up to 1 m wide and consisted of white to grey quartz, feldspar, and chlorite and are generally barren of sulphides. Due to a major change in elevation, a long topographic lineament, and the intensive quartz and calcite veining, a major fault is assumed in the area trending 120 to 140 degrees. It is possible that the porphyry intruded along the fault, along the contact of the gabbroic and metavolcanic rocks, resulting in silicification, carbonatization and recrystallization. The mafic metavolcanic rocks have a highly developed foliation and are carbonatized to a greater or lesser degree.
| Rock Type | Rank | Composition | Texture | Relationship | Quartz Porphyry | 1 | Quartz | Porphyry | Near |
|---|---|---|---|---|
| Gabbro | 2 | Gabbro | Near | |
| Mafic lava flow-unsubdivided | 3 | Flow | Near | |
| Vein | 4 | Quartz/Calcite | Host | |
| Aplite | 5 | Aplite-Trachyte | Host |
Dec 07, 2005 (B Nelson) - Two ages of felsic intrusives appear to be present: 1). the oldest are represented by a pinkish quartz-feldspar porphyry. 2). the younger phase is represented by generally narrow aplite dykes.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrite | Economic | Ore | ||||
| 1 | Quartz | Economic | Gangue | ||||
| 2 | Calcite | Economic | Gangue | ||||
| Quartz | Alteration | Silicification | 1 | Strong | Veins | ||
| Chlorite | Alteration | Chloritic | 2 | Unknown | Disseminated | ||
| Feldspar | Alteration | Feldspathization | 3 | Unknown | Disseminated | ||
| Unspecified | Alteration | Carbonatization | 4 | Unknown | Disseminated | ||
| Calcite | Alteration | Carbonatization | 5 | Unknown | Disseminated | ||
| Malachite | Alteration | Supergene | 6 | Unknown | Disseminated |
May 17, 2019 (B Nelson) - Abundant quartz veins were observed, giving the occurrence the 'Quartz Stockwork' name. Quartz and calcite veinlets are present throughout the mafic metavolcanics and gabbro and at one location at the base of a cliff, disseminated pyrite and chalcopyrite, with malachite stain, was observed hosted by a fine-grained aplite-trachyte dyke. Minor pyrite and chalcopyrite was also observed in several of the veins. All gold samples taken by Resident Geologist staff returned value of <0.01 oz/ton. All silver samples returned <0.10 oz/ton. The best copper value was 0.14% (Schneiders et al., 1996).
May 17, 2019 (Therese Pettigrew) - Sample BD-2 assayed 1036 ppm Cu from a quartz carbonate stockwork in a silicified mafic volcanic with minor pyrite, trace chalcopyrite, and malachite staining. Sample BD-4 assayed 1765 ppm Cu from a strongly foliated volcanogenic metasediment with up to 30% sulphides present (mainly pyrite with a trace of chalcopyrite) (Assessment file 42D14NW2003).
Date: Feb 12, 1997
Geologist: B Nelson
Notes: Resident Geologist personnel visited the occurrence July 7, 1983.
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:
MonoMap - Mineral deposits of the Big Duck Lake area, District of Thunder Bay
Publication Number: R027 Page: 38-39 Date: 1997
Author: Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Big Duck Lake area, District of Thunder Bay
Publication Number: M2023 Scale: 1:15,840 Date: 1997
Author: Pye E.G.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.
Publication Number: OFR5951 Page: 220-222 Date: 1996
Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.
Publisher Name: Ontario Geological Survey
Location:
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