Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000002475Deposit Name(s) | Mud Lake No. 3 - 1930 |
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Deposit Status | occurrence |
Date Created | 2020-Dec-18 |
Date Last Modified | 2020-Dec-18 |
Created By | T Pettigrew |
Revised By | T Pettigrew |
Primary Commodities: gold
Township or Area: Elmhirst
Latitude: 49° 46' 22.8" Longitude: -87° 40' 18.83"
UTM Zone: 16 Easting: 451621 Northing: 5513609 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E13SE
Point Location Description: Map in OFR5988 p. 15
Location Method: data compilation
Access Description: The property is accessible by travelling north along Highway 801 (Paint Lake Road) from Highway 11 for 13.6 km to the Namewaminikan (Sturgeon) River Bridge, then proceeding east on the Sturgeon River Road for 8.2 km. At this point, a tractor road traverses south for 1 km to the main stripped area comprising the occurrence.
1930s: the area was explored and trenched during the gold rush to the area. 1989: Noranda Exploration Company Ltd. conducted prospecting and geological mapping. 1995: Edda Resources carried out stripping and sampling. 1998: F. Houghton, P. Houghton, and L. Clarke carried out prospecting, stripping, trenching, and VLF-EM surveys. 2005: Alto Ventures conducted an IP survey, geological mapping, and sampling. 2007: Alto Ventures carried out prospecting, stripping, sampling, and drilled 3 DDH totaling 159 m.
Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
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2.38536 | 20000003447 | Open |
2.21037 | 42E13SE2015 | Open |
2.13156 | 42E13SE0110 | Open |
W9540-00143 | 42E13SE0033 | Open |
Province: Superior
Subprovince: Wabigoon
Belt: Onaman
Intrusion: Coyle Lake Stock
Geological Age: Archean
12/18/2020 (T Pettigrew) - The property is located within the south--central portion of the Onaman--Tashota metavolcanic belt, which is part of the eastern Wabigoon Subprovince. This region of Elmhirst Township is underlain by a thick succession of intermediate to felsic metavolcanic rocks, mainly of pyroclastic origin, which have been intruded by a medium--grained granodiorite to diorite body known as the Coyle Lake stock. The Coyle Lake stock is one of a group of three early-Precambrian intrusive bodies occupying a 20 km area immediately north of the Paint Lake fault. A major structural feature, first identified by Mackasey and Wallace (1972) and here named the Coyle Lake fault traverses the southeast portion of the Coyle Lake stock. The fault mimics the regional northeast structural trend and offsets the contact of the Coyle Lake stock in the Mud Lake area (Mason et al., 1999).
Rock Type | Rank | Composition | Texture | Relationship |
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felsic intrusive | 1 | granodiorite | ||
intermediate metavolcanics | 2 | tuffs | host |
12/18/2020 (T Pettigrew) - The Mud Lake No. 3 occurrence is located at the contact zone between the Coyle Lake granodiorites and surrounding metavolcanic rocks. This is indicated by the degree of mixing of lithologies and alteration observed within the exposed zone. A continuous outcrop approximately 106 m long hosts a central horizon of intense shearing averaging 3 to 4.5 m wide, along a 050 degree strike. At this point, the zone lies only 200 m northeast of the indicated trace of the Coyle Lake fault. The highly sheared, chlorite-rich intermediate metavolcanic tuffs exhibit prominent, rusty, carbonate alteration (most intense within the first 60 m from the northeast end) and contain numerous, en-echelon quartz-carbonate veins and veinlets. Shearing becomes less intense at the southeast end of the exposure, where the zone may have been offset to the south by one of a series of minor high angle faults striking approximately 035 degrees. Silicified, sericitized, carbonatized granodiorite is exposed along the southern contact with the sheared metavolcanic rocks. In addition, pods or boudins, up to 50 cm wide, of pink, highly silicified, quartz-eye feldspar porphyry occur within the host volcanics. These appear to be altered equivalents of the surrounding granodiorites (Mason et al., 1999).
Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
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1 | pyrite | economic | ore | ||||
2 | chalcopyrite | economic | ore |
12/18/2020 (T Pettigrew) - Mineralization consists primarily of seams and disseminations of pyrite ranging up to 10% within the most intensely sheared portions of the zone. Minor amounts of chalcopyrite were also noted. Sulphide content is highest within the main metavolcanic shear horizon. However, the granodiorite contains from 1 to 3% pyrite, although it has not been assayed for gold. Samples taken by OGS staff in 1998 returned assays ranging from 1.72 to 32.4 g/t Au. Samples taken by F. Houghton returned assays ranging from 8.5 to 35.28 g/t Au. Samples taken by M. Smith returned assays ranging from 8.5 to 53.8 g/t Au (Mason et al., 1999). DDH MUD07-14 returned 2.92 g/t Au over 1.1 m (Assessment report 20000003447).
Publication - Thunder Bay North (Beardmore-Geraldton) District – 1998; In: Report of Activities, 1998, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report, p. 14-16
Publication Number: OFR5988 Date: 1999
Author: Mason, J.K., White, G.D., O’Brien, M.S., Walden, A., Komar, C.
Publisher Name: OGS
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