Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52O12NE00006

Record: MDI52O12NE00006

General

Commodities

Primary Commodities: Zinc, Lead, Silver

Secondary Commodities: Copper

Location

Township or Area: Baggy Lake Area

Latitude: 51° 38' 6.89"    Longitude: -91° 33' 43.07"

UTM Zone: 15    Easting: 599520.001   Northing: 5721450.001    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52O12NE

Point Location Description: General

Location Method: Conversion from MDI

Exploration History

1960: Diamond drilling by Castlebar Silver & Cobalt Mines in the area between Lang Lake and Saddle Lake. 1968-1972: Bochawna Copper Mines Ltd. and the Hanna Mining Company conducted an extensive exploration program in the area north of Lang Lake, including a diamond drilling program that outlined a copper deposit. 1969-1971: The Algoma Steel Corporation Ltd. conducted extensive diamond drilling and geophysics in northwest of Lang Lake for iron ore. 1969-1970: Card Lake Copper Mines Limited conducted grid mapping geophysics and diamond drilling for gold and base metals in the Saddle Lake, Boyes Lake, Card-Cannon Lakes, and Heinz Lake areas. 1970: Mextor Mineral Ltd. and Kennco Exploration Limited conducted geophysics and diamond drilling for base metals in the Saddle Lake area. 1984-1986: Duration Mines conducted geophysics, grid mapping and diamond drilling on the southern arm of the Lang Lake greenstone belt for base metals mineralization. 1985-1986: Geological, geochemical and geophysical surveys in the western Lang Lake area by Utah Mines. 1991-1992: Noranda Exploration Company Limited conducted grid mapping, geophysics and diamond drilling for base metals in the Lang Lake and Saddle Lake areas. 2003-2007: East-West Resource Corporation conducted geological and geophysical surveys and diamond drilling of the Lang Lake copper deposit.

Assessment Work on File

Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Lang Lake

Geological Age: Neoarchean  

Geology Comments

Mar 30, 2007 (Mark Puumala) - The area geology is described in MDI52O12SE00012.

Lithology

Mineralization

Mineralization Comments

Mar 30, 2007 (Mark Puumala) - MacDougall (1992) indicates that the Saddle Lake area is largely underlain by pillowed mafic metavolcanic rocks. These mafic flows are intercalated with felsic metavolcanics (quartz crystal tuff and rhyolite) and chert exhalite horizons. A relatively wide felsic metavolcanic sequence (300 to 400 m wide) consisting of strongly chloritized blue quartz-eye porphyritic rhyolite and coarse-grained volcanic fragmental rocks is exposed along the northwest shore of Saddle Lake. This sequence extends for a minimum of 1 km to the west-northwest, and is also interpreted to extend to the southeast below the surface of Saddle Lake (MacDougall 1992). Alteration mineral assemblages that have been observed by MacDougall (1992) include chlorite-garnet-actinolite, silicification and local sericitization. The Saddle Lake occurrence is exposed at surface in three trenches that cover a strike-length of approximately 100m (MacDougall 1992). The mineralized zone is indicated to be approximately 7 to 10 m wide, and strikes approximately northwest-southeast. The mineralization is reported to be hosted in a strongly-chloritized, locally silicified and sericitized volcanic fragmental unit (i.e., part of the felsic metavolcanic sequence described above) that is interbedded with pillowed basalt and thin felsic tuff horizons. Mineralization is described by MacDougall (1992) as consisting of disseminated to stringer pyrite-pyrrhotite with local concentrations of stringer sphalerite, galena and minor chalcopyrite. Preliminary whole-rock geochemical analysis of samples collected from the mineralized zone was reported by MacDougall (1992) to have been indicative of sodium depletion, which is considered to be a favourable indication for volcanogenic massive sulphide-type (VMS) mineralization. MacDougall (1992) reported grab sample assays from the surface showing of up to 0.08% Cu, 3.55% Pb, 4.29% Zn and 3.68 oz/ton Ag, and chip sample assays of 0.01% Cu, 0.219% Pb, 1.55% Zn and 0.21 oz/ton Ag over 4.0 m. Two diamond drill holes were advanced in the vicinity of the occurrence by Noranda in 1992 to test a cross-cutting geophysical anomaly (MacDougall 1992). Although assay values reported from these drill holes were low, whole-rock geochemical analyses exhibited alteration patterns (i.e., Na-enrichment, Ca- and Mg-depletion) consistent with a VMS-type hydrothermal system.

Mineral Record Details

References

Map - Lang-Cannon lakes area (west half), District of Kenora (Patricia Portion)

Publication Number: P0581 Scale: 1:31,680    Date: 1997

Author: Fenwick K.G.

Publisher Name: Ontario Dept. of Mines

Location:

Compend - Annual report of Resident Geologists Section, Geological Branch, 1969, part 1

Publication Number: MP033 Date: 1970

Author:

Publisher Name: Ontario Dept. of Mines

Location:

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For detailed information regarding this mineral record please contact the Thunder Bay North Resident Geologist District Office