Ontario Geological Survey
Permanent Link to this Record:
MDI000000000296
| Record Name(s) | Esso Cut No 2. - 1986, J Location - 1939 |
|---|---|
| Related Record Type | |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2007-May-23 |
| Date Last Modified | 2022-Jun-09 |
| Created By | |
| Revised By |
Primary Commodities: Gold
Township or Area: Hewitt Lake Area
Latitude: 52° 29' 26.66" Longitude: -92° 52' 4.93"
UTM Zone: 15 Easting: 508960 Northing: 5815630 UTM Datum: NAD83
Resident Geologist District: Red Lake
NTS Grid: 53C07NW
Point Location Description: Assessment file map (Farstad 1986).
Location Method: Data Compilation
1936-37: Trenching and diamond drilling by Spirit lake Gold Mines. 1982: Prospecting and sampling by Esso Minerals.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.5179 | 53C10SW0005 | 53C10SW0005 |
| 2.5180 | 53C07NW0009 | 53C07NW0009 |
Province: Superior
Subprovince: Sachigo
Terrane: North Caribou
Belt: North Spirit Lake
Geological Age: Neoarchean
May 23, 2007 (Mark Puumala) - The area geology is described in MDI53C07NW00025.
| Rock Type | Rank | Composition | Texture | Relationship | Ironstone-unsubdivided | 1 | Host |
|---|---|---|---|---|
| Mudstone | 2 | Adjacent | ||
| Mafic lava flow-unsubdivided | 3 | Near |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Arsenopyrite | Economic | Ore |
May 23, 2007 (Mark Puumala) - This occurrence is based upon anomalous gold mineralization within brecciated iron formation reported by Farstad (1982). The geology in the vicinity of the occurrence is described by Farstad (1982) as consisting of mafic metavolcanics to the northwest. These rocks are overlain by a southeast-facing sequence of interbedded chert-magnetite iron formation (brecciated) and laminated mudstone. Carbonatized fragmental metavolcanics and metasedimentary rocks (including sandstone, chert pebble conglomerate and mudstone) occur further to the southeast, where Bateman (1939) described a mineralized zone referred to as the J Location. Mapping by Farstad (1982) indicates that stratigraphy in the vicinity of the occurrence strikes approximately northeast and dips steeply (85 degrees) to the southeast. Anomalous gold assays were reported by Farstad (1982) from an arsenopyrite-bearing zone (Cut No. 2) in the brecciated iron formation. Notable results from this program included a 3.05 m channel sample that averaged 0.025 oz/ton Au, with a 0.7 m section that assayed 0.05 oz/ton Au. Farstad (1982) also reported trace gold concentrations nearby in association with arsenopyrite in the matrix of the quartz pebble conglomerate (J Location). Bateman (1939) described the J Location as a mineralized chert pebble conglomerate interbedded with rusty weathering greywacke, arkosic quartzite and slate. Mineralization was reported to consist of pyrite, varying amounts of arsenopyrite, and minor pyrrhotite and chalocopyrite occurring within the conglomerate matrix. The mineralized conglomerate was indicated to be approximately 4.5 to 7.5 m wide and has a strike length in excess of 150 m. Bateman (1939) reported gold assays from the J Location of less than 0.04 oz/ton.
| Rank | Classification |
|---|---|
| 1 | Lode (Gold) |
| Rank | Characteristic |
|---|---|
| 1 | Stratabound |
Part - Geology of the North Spirit Lake area
Publication Number: ARV47-07.002 Date: 1997
Author: Bateman J.D.
Publisher Name: Ontario Dept. of Mines
Location:
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