Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000000312| Deposit Name(s) | Pontoon Bay - 1987 |
|---|---|
| Deposit Status | occurrence |
| Date Created | 2007-Jun-05 |
| Date Last Modified | 2020-Dec-17 |
| Created By | M A Puumala |
| Revised By | T Pettigrew |
Primary Commodities: gold
Secondary Commodities: silver, copper
Township or Area: Hewitt Lake Area
Latitude: 52° 29' 2.61" Longitude: -92° 56' 50.21"
UTM Zone: 15 Easting: 503580 Northing: 5814880 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 53C07NW
Point Location Description: Assessment file map (Brereton 1988).
Location Method: data compilation
1987-88: Prospecting, geological mapping, sampling and assays by Petromet Resources. 1989: Quote Resources Inc. conducted magnetic and VLF-EM surveys. 1990: Prospecting, geological mapping, sampling and assays by Pelangio-Larder Lake Mines.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 53C07NW0001 | 20000004867 | Open |
| 53C07NW0002 | 20000004866 | Open |
| 53C07NW0003 | 20000004865 | Open |
| 2.12498 | 53C07NW0005 | Open |
Province: Superior
Subprovince: Sachigo
Belt: North Spirit Lake
Terrane: North Caribou
Geological Age: Neoarchean
Tectonic Assemblage: Hewitt
| Structure Name | Scale | Strike | Dip | Trend | Plunge |
|---|---|---|---|---|---|
| Mineralized Shear | local | 315 | 80 |
06/05/2007 (M A Puumala) - The area geology is described in MDI53C07NW00025.
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| metasedimentary | 1 | adjacent | ||
| intermediate to felsic metavolcanics | 2 | adjacent | ||
| intermediate intrusive | 3 | diorite | near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | pyrite | economic | ore | ||||
| 2 | arsenopyrite | economic | ore | ||||
| 3 | chalcopyrite | economic | ore |
06/05/2007 (M A Puumala) - Brereton (1988) reports that anomalous gold assays were obtained at this location from a number of shear-hosted, sulphide-rich laminae and disseminations within metasedimentary/metavolcanic rocks in close proximity to (i.e., immediately southwest of) the contact with the Bijou Point Complex diorite intrusion. The individual mineralized horizons are relatively narrow (i.e., less than 1 m wide) and contain up to 15% arsenopyrite, which occurs as fine needle-like grains. Mapping by Brereton (1988) indicates that the most significant mineralized shear is oriented approximately 315/80, approximately parallel to the inferred intrusive contact. The most significant assay reported by Brereton from this area was 0.36 oz/ton Au from the main mineralized zone (sample NSL-87-12). Additional anomalous assays were obtained from an approximately parallel zone located immediately to the west. These assay results included 0.21 oz/ton Au (NSL-87-13) and 0.088 oz/ton Au (PBR-88-13).
12/17/2020 (T Pettigrew) - Gold assay values ranged up to 0.74 oz/ton from a sample of pyrite-arsenopyrite shear material from within the diorite on the north end of the small island. The overall shear zone here is in excess of 20 m in width although the mineralized zone from which the sample was taken is less than 30 cm wide. Samples of sheared, rusty pyrite-arsenopyrite-bearing diorite Immediately to the south, on and near the lake shore, returned significant gold values (NSL-87-09, 0.17 oz/ton Au; NSL-87-10, 0.18 oz/ton Au; NSL-87-11, 0.17 oz/ton Au). Individual mineralized zones appear to be less than 0.5 m. Sample NSL-87-12 returned 0.36 oz/ton Au. The sample is from a zone less than 1 m in width containing locally up to 15% or more of fine arsenopyrite needles as sulphide-rich laminae and disseminations. Sampling to the west of sample NSL-87-13 (0.21 oz/ton Au) returned 0.088 oz/ton Au (sample PBR-88-13). The 15 cm quartz-chalcopyrite vein on claim 977535 assayed 0.097 oz/ton Au (sample PBR-88-05). Gold values correlate in a general way with both copper and arsenic although the correlation would seem to be the strongest with arsenic. Pyrite-bearing samples with very low As-Cu concentrations typically contain little or no gold (e.g. PBR-88-02, 08, etc.). Modestly anomalous Sb and Pb values (80 ppm, 1500 ppb) were recorded in samples PBR-88-05 and 010, respectively. An Hg value of greater than 1,000 ppb was recorded in sample PBR-88-03 corresponding to a gold value of 0.028 oz/ton. Sample PBR-88-5 returned 24,000 ppm Cu and 4200 ppb Au (Assessment report 20000004867). Samples taken in 1990 by Pelangio-Larder Mines returned up to 0.17 oz/t Au (Assessment report 20000004865).
| Rank | Classification |
|---|---|
| 1 | alkalic porphyry |
| Rank | Characteristic |
|---|---|
| 1 | sheared |
Publication - Geology of North Spirit Lake Area
Publication Number: R150 Date: 1977
Author: Wood, J.
Publisher Name: OGS
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