Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42D13NE00009

Record: MDI42D13NE00009

General

Commodities

Primary Commodities: Fluorite, Barite

Secondary Commodities: Amethyst

Location

Township or Area: Yesno

Latitude: 48° 53' 52.56"    Longitude: -87° 37' 54.3"

UTM Zone: 16    Easting: 453698   Northing: 5416302    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42D13NE

Point Location Description: Sample 7157 location from map in Assessment file 42D13NE0007

Location Method: Data Compilation

Access Description: The occurrence is located in Yesno Township approximately 4 km west of the Pays Plat Indian Reserve on Trans-Canada Highway 17 (Figure 18). Access is available via Highway 17, about 4 km west of the Pays Plat Indian Reserve. The vein system crosses the highway and further access is provided by a communication tower access road branching off from the main highway.

Exploration History

1972: The property was staked by P. Proulx and transferred to Asarco Explorations. 1973: Geological reconnaissance mapping, silt and water sampling by Asarco Explorations. 1991: Elwood Fournier held a claim block covering the vein. Diamond drilling, trenching and manual work was completed. 1992: Property was re-staked by A. Eveleigh and transferred to A. Traverse.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Schreiber-Hemlo

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Schnieders) - Schnieders et al. ,1996 (OFR 5951), describes a continuous mineralized fluorite zone extending for more than 915 m. The zone varies in width from 1.2 to 13.5 m. It consists of a milky quartz vein, flanked by a breccia, with the matrix made up of fluorite, quartz, amethyst and barite.

Dec 07, 2005 (R Degagne) - The area is underlain by an igneous complex of two major rock types, granite and pegmatite. This complex is cut by two major structures. The earlier recognizable structure is represented by a quartz-epidote vein system and the later structure represents a system of mafic dikes. The granitic rock is fine to medium grained and pink in colour, and ranges in composition from a high silica-potassium granite to a granodiorite. Many portions of the granite contain inclusions or xenoliths of mafic material that have been altered by the intruding granite. Inclusions vary in size from 5 cm up to many metres in diameter. Some inclusions show sharp contacts whereas others show gradational contacts. The granite is cut by numerous narrow pegmatite veins composed of quartz and coarse-grained feldspar. The veins vary in width from 5 cm to 0.6 or 1 meter and strike N 70 degreesE. There are numerous fluorite veins in the vicinity. The majority of these are found in the surfaces of the joint planes, as seams of purple fluorite cubes. (Resident Geologist's Files, Schreiber-Hemlo District, Thunder Bay).

Lithology

Lithology Comments

Dec 07, 2005 (R Degagne) - The area is underlain by an igneous complex of two major rock types, granite and pegmatite. This complex is cut by two major structures. The earlier recognizable structure is represented by a quartz-epidote vein system and the later structure represents a system of mafic dikes. The granitic rock is fine to medium grained and pink in colour, and ranges in composition from a high silica-potassium granite to a granodiorite. Many portions of the granite contain inclusions or xenoliths of mafic material that have been altered by the intruding granite. Inclusions vary in size from 5 cm up to many metres in diameter. Some inclusions show sharp contacts whereas others show gradationalcontacts.The granite is cut by numerous narrow pegmatite veins composed of quartz and coarse-grained feldspar. The veins vary in width from 5 cm to 0.6 or 1 meter and strike N 70 degreesE. There are numerous fluorite veins in the vicinity. The majority of these are found in the surfaces of the joint planes, as seams of purple fluorite cubes. (Resident Geologist's Files, Schreiber-Hemlo District, Thunder Bay).

Mineralization

Mineralization Comments

Dec 07, 2005 (R Degagne) - Mapping by Asarco Exploration Co. indicated a continuous mineralized fluorite zone extending for more than 915 m. The zone varies in width from 1.2 m to 13.5 m. It is made up of a milky quartz vein which dips vertically and strikes northeast- southwest. The vein is flanked on the northwest by a breccia, the matrix of which is made up of fluorite, milky-white quartz, amethyst, and barite. Breccia fragments are derived from the surrounding granites and have been altered by silicification and epidotization. Fluorite mineralization is erratic throughout the vein. Three major fluorite bearing veins, and a few minor ones have been located. They contain large granitic fragments cemented together by quartz, barite, and fluorite. The quartz is usually a white milky colour although some cavities are lined with amethyst crystals. The breccia fragments contain epidote, giving the breccia zones a greenish-yellow colouration on fresh surfaces. (Resident Geologist's Files, Schreiber-Hemlo District, Thunder Bay) CHEMICAL ANALYSES: The following assay values were obtained by Asarco on the Sunset Vein: Sample No. 7157: Assay Width 7.6 m (25'), 5.48% CaF2. Sample No. 7158 : Assay Width 1.8 m (6') , 11.13% CaF2. Sample No. 7159 : Assay Width 0.5 m (1.7'), 1.25% CaF2. Sample No. 7160 : Assay Width 2.1 m (7'), 3.94% CaF2. Sample No. 7161: Assay Width 3 m (10'), 0.72% CaF2. Sample No. 7162: Assay Width 2.7 m (9'), 0.54% CaF2. Sample No. 7163: Assay Width 1.2 m (4') 0.60% CaF2. Sample No. 7164: Assay Width character sample, 0.43% CaF2. Sample No. 7165: Assay Width 1.2 m (4'), 0.35% CaF2. Sample No. 7142: Assay Width character sample, 20.48% CaF2. (Resident Geologist's Files, Schreiber-Hemlo District, Thunder Bay).

Alteration Comments

Dec 07, 2005 (R Degagne) - Breccia fragments are derived from the surrounding granites and have been altered by silicification and epidotization. Fluorite mineralization is erratic throughout the vein. Three major fluorite bearing veins, and a few minor ones have been located. They contain large granitic fragments cemented together by quartz, barite, and fluorite. The quartz is usually a white milky colour although some cavities are lined with amethyst crystals. The breccia fragments contain epidote, giving the breccia zones a greenish-yellow colouration on fresh surfaces.

Mineral Record Details

Mineral Zones - Size and Shape

Rank: 1       Structure Type: Breccia

Site Visit Information

Date: Dec 23, 1996

Geologist: R Degagne

Notes: Visited in July, 1991 by P. Hinz | R. M. Landry (OGS OFR 5889, 1994) . COMMENTS/RECOMMENDATIONS: The Sunrise and Sunset Veins are narrow and contain erratic flourite values. For these reasons, the veins will probably only be of interest to rock hounds and mineral collectors. (Hinz, P. | Landry, R. M., OGS OFR 5889, 1994, p. 127)

References

Mono - Industrial Mineral Occurrences and Deposits in Northwest Ontario

Publication Number: OFR5889 Page: 125-127  Date: 1994

Author: Hinz P., Landry R.M.

Publisher Name: Ontario Geological Survey

Location:

File - Schreiber-Hemlo Resident Geologist Mineral Deposit Files, Thunder Bay office

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Map - Nipigon-Schreiber, geological compilation series, Thunder Bay District

Publication Number: M2232 Scale: 1:253,440    Date: 1973

Author: Carter M.W., McIlwaine W.H., Wisbey P.A.

Publisher Name: Ontario Division of Mines

Location:

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