Ontario Geological Survey
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MDI52F11SW00034
| Record Name(s) | Mulcahy Lake - 1991 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 2011-Feb-15 |
| Date Last Modified | 2022-Jul-18 |
| Created By | |
| Revised By |
Primary Commodities: Palladium
Secondary Commodities: Chromium, Platinum
Township or Area: Line Lake Area
Latitude: 49° 35' 18.08" Longitude: -93° 20' 40.74"
UTM Zone: 15 Easting: 475089.784 Northing: 5492920.964 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52F11SW
Point Location Description: MulcahyLake property is located NW of MuskegBay, EagleLake & NE of MulcahyLake
Location Method: Conversion from MDI
Access Description: The property is readily accessible via the Beaverhouse Lake Lumber Road which traverses the property from east to west, situated 45km southwest of Dryden. A series of subsidiary logging roads provides good access to much of the property.
- Work carried out prior to 1987 is summarized in a previous report (Dupre, 1987). - Summer of 1987, a systematic reconnaissance programme of lithogeochemical sampling, geological mapping, basal till geochemistry, petrographic sampling and magnetic susceptibility measurements was conducted across all stratigraphic units with PGE potential (Grootenboer, 1988). Anomalous concentrations of platinum and palladium were found in some pyroxenite horizons of the Lower Zone of the Mulcahy Gabbro. - Early 1988, a systematic program of basal till geochemistry was carried out over selected areas of the Lower Zone while some of the anomalous pyroxenites were further investigated by trenching during June, 1988 (Trapnel, 1988). Topographic conditions prevented successful trenching of all horizons of interest, while geological mapping, carried out in conjunction with the trenching, revealed the presence of many more pyroxenites than previously known. Ontario Geological Survey (OGS) airborne geophysical data from the Dryden Area Airborne Electromagnetic and Magnetic Survey were reprocessed with the view of revealing subtle targets relevant to the search for PGE mineralization. Interpretation (Tucker, 1988) indicates the presence of several possible stratiform bedrock conductors within the Lower Zone. - Sept., 1988: Dr. John Schindler, President of Contwoyto Goldfields Limited, executed a program of lithogeochemical sampling, geological mapping, magnetic susceptibility measurements, and VLF surveys over a portion of the Lower Zone of the Mulcahy Gabbro, (area of this occurrence). The present investigation was aimed at mapping all outcropping of pyroxenites found in the Lower Zone and at identifying the the source of airborne magnetic and aeromagnetic anomalies. (Kenora AF 52F/11SW, L-4, 697895 Ontario Ltd., Line Lake - Geo Report, p.2-3)
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 52F/11SW, L-4, #697895 Ontario Ltd. | 52F11SW0004 | 52F11SW0004 |
Province: Superior
Geological Age: Precambrian
Feb 15, 2011 (J Bongfelt) - 'Morrison et al (1982) subdivide the gabbro into Lower, Middle, and Upper Zones, based on the nature of the layering and preliminary petrographic/chemical data.' 'The Lower Zone is 1.7 to 2.0 km thick and is characterized by cumulates which define rhythmic and intermittently layered sequences and consistent fractionation trends. Gabbroic norites predominate in the basal part of the Lower Zone, whereas gabbro (senso strictu) is more abundant in the upper part. The top part of the Lower Zone is defined by the presence of gabbros containing fractionated assemblages including iron-rich olivine (Fo 28), apatite, and magnetite-rich layers. The 200 metre thick Mixed Zone comprises the transition between the Lower and Middle Zones. It consists of relatively fractionated gabbros and intercalated less fractionated gabbros and exhibits a rapid reversal of fractionation trends.' (Kenora AF 52F/11SW, L-4, 697895 Ontario Ltd., Line Lake - Geo Report, p.3)
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Chalcopyrite | Economic | Ore | ||||
| 10 | Magnetite | Economic | Ore | ||||
| 15 | Pyrrhotite | Economic | Ore |
Feb 15, 2011 (J Bongfelt) - 'No occurrences of Platinum Group Elements (PGE's) had been reported prior to 1987 within the Mulcahy Lake Intrusion.' 'Trenches 1 to 4, and 6 to 9 were remapped to conform to the present lithological classification and some of the mineralized intervals reported by Trapnell (1988) were resampled, particularly Trench 7 where high Pd values up to 870 ppb were reported. Smooth, hard rock surfaces made sampling difficult, but with the exception of Trench 8, representative samples were obtained from all trenches. Analytical results confirm the absence of PGE mineralization. Remapping of Trench 7 failed to identify the cause of the high Pd values which occur in relatively feldspathic gabbros. A few shears cut across the trench in the vicinity of the highest values. Systematic resampling of the trench, using a diamond saw to cut a longitudinal groove is necessary to verify the Pd values.' (Kenora AF 52F/11SW, L-4, 697895 Ontario Ltd., Line Lake - Geo Report, p.7)
File - Kenora Resident Geologist Historical File 52F/11SW00034, Mulcahy Lake - Black
Publication Number: Date: 2011
Author:
Publisher Name:
Location: Kenora RGP
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