Ontario Geological Survey
Permanent Link to this Record:
MDI000000000143
| Record Name(s) | Luella Lake Occurrence - 1972 |
|---|---|
| Related Record Type | |
| Record Status | Occurrence |
| Date Created | 2006-Sep-28 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Mark Puumala |
| Revised By | Mark Puumala |
Primary Commodities: Copper, Nickel
Township or Area: Ficht Lake Area
Latitude: 51° 12' 7.35" Longitude: -88° 46' 50.35"
UTM Zone: 16 Easting: 375600 Northing: 5673799.997 UTM Datum: NAD83
Resident Geologist District: Thunder Bay North
NTS Grid: 52P02NW
Point Location Description: Location obtained from assessment file map.
Location Method: Data Compilation
1972-75: Getty Mines carried out an exploration program consisting of geological mapping, geochemical surveying, geophysics (magnetic and electromagnetic surveys), diamond drilling (10 ddh), and assaying. 2003-2004: East West Resource Corporation carried out an exploration program on their Linsey Bay Property consisting of airborne geophysical surveys (mag and EM), diamond drilling and assaying.
Province: Superior
Subprovince: Uchi
Terrane: North Caribou
Domain: Uchi
Belt: Miminiska-Fort Hope
Geological Age: Archean
Sep 28, 2006 (Mark Puumala) - The Luella Lake occurrence is located within the transition zone between the Uchi Subprovince (volcano-plutonic) to the north and the English River Subprovince (metasedimentary) to the south. This deposit is located near the southern margins of a granitic batholith referred to by Wallace (1981) as the Shabuskwia Lake Batholith. Rocks in the immediate vicinity of the deposit have been described by Barker (1972) and Caven (2003) as gabbro, ultramafic intrusives, granite and metamorphic rocks. Recent drill hole logs prepared for East West Resource Corporation (2004) describe a sequence consisting of granitic pegmatite, gabbro, pyroxenite, felsic volcanics, and intermediate to mafic volcanics. The host intrusion appears to be one of a series of mineralized mafic/ultramafic bodies located near the southern and eastern margins of the Shabuskwia Lake Batholith between Shabuskwia and Weese Lakes. Mason et al. (2000) interpret this series of occurrences to be associated with a continuous 600 to 700 m thick anorthositic gabbro sill. Barker (1972) indicates that the gabbro unit that underlies the property has a crude compositional banding and schistosity that ranges in orientation from 110 to 130, with a near-vertical dip. However, the electromagnetic anomaly drilled by East West Resource Corporation at this location is oriented east-northeast, most likely parallel to the contact between the anorthosite and metavolcanics.
| Rock Type | Rank | Composition | Texture | Relationship | Gabbro | 1 | Gabbro-Pyroxenite | Host |
|---|
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Chalcopyrite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore | ||||
| 3 | Pentlandite | Economic | Ore |
Sep 28, 2006 (Mark Puumala) - Barker (1972) described the main surface showing as being located within gabbro, near the contact with an inlier of metamorphic rocks (volcanics?) that is located to the north of the showing. More recently, Caven (2003) describes the host rock as a gabbro-pyroxenite that has been metamorphosed to a hornblende-biotite-chlorite schist. The sulphide mineralization is generally described as being finely disseminated and interstitial to the silicates, with occasional larger sulphide blebs. Remobilization of sulphides along shears was also noted. Recent drill hole logs (East West, 2004) indicate that the most significant copper and nickel mineralization occurs in altered (chlorite) pyroxenite near the contact with a unit logged as felsic volcanics (perhaps the same unit described as a metamorphic inlier by Barker, 1972). Sulphide mineralization consists of disseminated to stringer pyrrhotite, chalcopyrite and pentlandite. Fragments of partially assimilated felsic volcanics are reported to be present in the mafic intrusion. The felsic volcanic unit is also reported to contain disseminated chalcopyrite and sericite. The most significant assays reported from this occurrence include the following: 5.6% Cu over 2.4 feet in Getty drill hole LL2; >1% Cu over 3.3 feet in East West drill hole L04-04; 1.31% Ni over 4 feet in Getty drill hole LL1; and 0.53% Ni over 4 feet in East West drill hole L-04-02.
| Rank | Classification |
|---|---|
| 1 | Mafic-Ultramafic Intrusion |
| Rank | Characteristic |
|---|---|
| 2 | Disseminated |
| 1 | Intrusive |
Map - Attwood Lake, Thunder Bay District
Publication Number: M2436 Scale: 1:31,680 Date: 1981
Author: Wallace H.
Publisher Name: Ontario Geological Survey
MonoMap - Geology of the Attwood Lake area, District of Thunder Bay
Publication Number: R203 Scale: Date: 1981
Author: Wallace H.
Publisher Name: Ontario Geological Survey
Book - Geological Survey of the Luella Lake Property for Getty Mines Limited
Publication Number: Assessment file Scale: Date:
Author: Barker, R.W. 1972.
Publisher Name:
Mono - Report of Activities 1999, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North-Sioux Lookout Districts
Publication Number: OFR6004 Scale: Date: 2000
Author: Mason J.K., Farrow D.G., Seim G.Wm., White G.D., O'Brien M.S., Walden A., Komar C.L.
Publisher Name: Ontario Geological Survey
Book - A Report on Airborne Geophysical Surveys on the Property of East West Resource Corporation Linsey Bay Claim Group.
Publication Number: Assessment file Scale: Date:
Author: Caven, R.J. 2003.
Publisher Name:
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