Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI000000002480| Deposit Name(s) | Mud Lake No. 1 - 1999 |
|---|---|
| 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' 44.28" Longitude: -87° 38' 51.67"
UTM Zone: 16 Easting: 453370 Northing: 5514257 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 42E13SE
Point Location Description: Assessment report 20000001185
Location Method: based on assessment
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.
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, and sampling.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 2.38536 | 20000003447 | Open |
| 2.21037 | 42E13SE2015 | Open |
| 2.19405 | 42E13SE2008 | Open |
| 2.13156 | 42E13SE0110 | Open |
| W9540-00143 | 42E13SE0033 | Open |
| 2.31724 | 20000001185 | Open |
Province: Superior
Subprovince: Wabigoon
Belt: Onaman
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 |
|---|---|---|---|---|
| intermediate intrusive | 1 | granodiorite | ||
| vein | 2 | quartz | host |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | pyrite | economic | ore | ||||
| 2 | chalcopyrite | economic | ore |
12/18/2020 (T Pettigrew) - The No. 1 zone has a narrow quartz vein and a number of narrow splays. The vein trends N. 20 E cutting obliquely across a N 60 E striking shear zone lying between foliated porphyritic material on the north side and foliated to schistose metavolcanics on the south side. The white quartz vein system has been exposed for 125 m. The first 30 m from the NE. has a width of 10 -15 cm, the vein is banded crack seal quartz and is mineralized up to 15% pyrite. The next 20 m along strike the vein widens out and ranges from 60 cm to 25 cm. The quartz is a banded crack seal vein mineralized with pyrite & chalcopyrite up to 15%. It is in this 20 m that the vein splits into 2 veins and splays occur here as well. For the next 40 m the vein becomes narrow again 6-15 cm. Mineralization remains 15% pyrite. For the next 25 m the vein begins to break up into multiple veinlets in a 1 m wide mineralized shear. Alongside of this one metre wide shear, two 10 cm wide quartz veins run parallel. Mineralization is about 5 to 7% pyrite & minor chalcopyrite. High grade Au assays have been obtained all along the 125 m of exposed vein, including values from 3.65 grams to 75.0 g/t Au from grab sampling (Assessment report 42E13SE2015). Samples taken in 2005 returned up to 30.067 ppm Au from a 20 cm quartz vein along the shear with 1% pyrite, 22.68 ppm Au from quartz veining with traces of pyrite in a blasted pit,19.963 ppm Au from a 20 cm quartz vein along the main shear, and 19.373 ppm Au from blasted rock containing quartz with patchy 1-2% pyrite disseminations (Assessment report 20000001185).
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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