Ministry of Energy, Northern Development and Mines
Permanent Link to this Record: MDI52J02SW00025| Deposit Name(s) | Cobb Bay North - 1985, Hoyle-regis - 1985 |
|---|---|
| Related Deposit Type | None |
| Deposit Status | occurrence |
| Date Created | 1995-May-30 |
| Date Last Modified | 2020-Apr-14 |
| Created By | Q Unknown |
| Revised By | T Pettigrew |
Primary Commodities: copper, gold
Secondary Commodities: silver
Township or Area: Fourbay Lake Area
Latitude: 50° 1' 49.86" Longitude: -90° 59' 43.68"
UTM Zone: 15 Easting: 643563 Northing: 5543949 UTM Datum: NAD83
Resident Geologist District: Kenora
NTS Grid: 52J02SW
Point Location Description: DDH 1B from Assessment report 52J01NW0018
Location Method: conversion from mdi
Source Map: OGS 1981 MAP 2456 NORTH ARM OF STURGEON LAKE
Sources Map Scale: 1:25 000
Access Description: The site is close to the Cobb Bay access point off Hwy 599 and can be most easily reached in season by boat or snowmobile from the access point.
1970-73: Sherto Exploration Ltd. and Cresus Mining Ltd. held a block covering the drilled area. Both companies conducted geophysical surveys over the property. 1985: Hoyle Resources Inc. and Regis Development Corp. conducted EM and magnetic surveys, and drilled 5 DDH totalling 306.3 m.
| Office File Number | Online Assessment File Identifier | Online Assessment File Directory |
|---|---|---|
| 52J02SW CI-0065 | 52J02SW0046 | Open |
| 52J02SW-0016 | 52J01NW0018 | Open |
Province: Superior
Subprovince: Wabigoon
Belt: Sturgeon Lake
Geological Age: Archean
01/26/2000 (R Tuomi) - The area is underlain by mafic metavolcanics and intercalated quartz porphyry and quartz-feldspar porphyry sills and dikes. Copper and gold values were optained in drill hole intersections and from samples in stripped areas. Diamond drill holes 1A and 1B drilled on claim Pa 668532 investigated an exposed quartz vein varying from 0.3 m to 2.4 m in width over a length of 24 m. The vein is hosted in a narrow north trending shear within pillowed mafic meta-basalts. A surface grab sample assayed 0.068 ounce gold per ton and 0.20 ounce silver per ton with minor values in copper and zinc. Hole 1A did not intersect the vein. Hole 1B inter-sected the vein and a chloritic shear zone which contained greater than 10 % sulphides in fractures and desemminations within the schist, predominantly pyrrhotite with minor chalcopyrite and pyrite. A sampled section from one of the drill holes assayed 1.21% copper, 0.14 ounce per ton silver and 0.02 ounce per ton gold over 0.2 m.
| Rock Type | Rank | Composition | Texture | Relationship |
|---|---|---|---|---|
| vein | 1 | quartz | host | |
| mafic metavolcanics | 2 | host | ||
| porphyry | 3 | quartz | near | |
| porphyry | 4 | quartz-feldspar | near |
02/07/2000 (R Tuomi) - MINERALIZATION OCCURS IN: quartz vein and sheared metabasalt. HOST ROCK: mafic metavolcanics OTHER ASSOCIATED ROCK TYPES: 1) quartz porphyry 2) quartz-feldspar porphyry.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Habit Description |
|---|---|---|---|---|---|---|---|
| 1 | pyrrhotite | economic | ore | ||||
| 2 | chalcopyrite | economic | ore | ||||
| 3 | pyrite | economic | ore | ||||
| 4 | gold | economic | ore | ||||
| carbonate | alteration | carbonatization | 1 | unknown | disseminated | ||
| chlorite | alteration | chloritic | 2 | unknown | disseminated | ||
| quartz | alteration | silicification | 3 | unknown | disseminated |
04/14/2020 (T Pettigrew) - DDH 1B returned 1.21% Cu, 0.02 opt Au (0.68 g/t Au), and 0.14 opt Ag (4.8 g/t Ag) over 0.6’ (0.18 m) from a quartz-carbonate-chlorite breccia with 5-8% pyrrhotite and 2-3% chalcopyrite. DDH 3 returned 0.48% Cu, 0.02 opt Au, and 0.15 opt Ag over 0.4’ from a brecciated quartz vein with 8% pyrrhotite and 1-3% chalcopyrite along fractures and in irregular patches (Assessment report 52J01NW0018).
02/07/2000 (R Tuomi) - Alteration due to shearing.
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