Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42D14SW00023

Record: MDI42D14SW00023

General

Commodities

Primary Commodities: Silver, Zinc, Lead, Gold

Location

Township or Area: Priske

Latitude: 48° 46' 48.64"    Longitude: -87° 15' 34.21"

UTM Zone: 16    Easting: 480936   Northing: 5403052    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42D14SW

Point Location Description: Shaft, trenches.

Location Method: Data Compilation

Access Description: The occurrence is located in Priske Township about 3.2 km south-southeast of Schreiber, approximately 1.2 km north of Worthington Bay, Lake Superior (claim map G-631, Priske Township). The property may be reached by using the old Schrieber dump (Worthington Bay) road which branches off Highway 17 at a point 4.4 km east of Schreiber. The road is followed for approximately 2.4 km south and west, to where a barely visible trail branches to the west just before a small creek. The old showings are located 335 m west of the Worthington Bay road.

Exploration History

1922: W. Longworth discovered a silver-bearing vein on claim TB 3850 and traced it intermittently to the shore of Lake Superior. The vein was exposed by stripping and trenching for a distance of 241 m from the point of discovery. An open cut, 7.3 m long and 4.6 m deep, followed the vein which widened to a maximum width of 1.07 m at the bottom of the cut. Some sampling was undertaken by C.E. Kingsley. P.E. Hopkins, a geologist with the Ontario Department of Mines, examined the property. 1924: Stripping and 'pop shooting' of the vein continued before development work at depth and shaft sinking. A 1.5 by 2.4 m shaft was sunk to a depth of about 6.1 m. 1936: Systematic sampling and flotation testing of ore was carried out by Noranda Mines Limited over a strike length of 52 m. 1937: A.S. Dadson of Elora Gold Mines (Erie Canadian Mines) conducted sampling on the vein. 1941: The Department of Mines, Ottawa took a 60 kg bulk sample. 1963: Denison Mines Limited undertook sampling of the vein and drilled three diamond drill holes (total length unknown). 1980: A 60 kg bulk sample was taken by Pamour Porcupine Mines. 1982: The showings were staked as claim TB 662786 by E.J. Korba. 1983: Interest was transferred 50% to United Continental Energy Corporation and 50% to Livingston Energy Corporation as part of a 161 claim group. An airborne geophysical (EM, VLF EM and magnetometer) survey was conducted by Aerodat Limited. 1982-1983: Ground around and covering the occurrence was staked by P. Skalesky. 1989: An airborne geophysical survey was flown on the property. 1991: Noranda Exploration Co. Ltd. optioned the property as part of the Rooster Canyon block; they carried out prospecting, mapping and humus geochemical sampling. 1996: D. Skalesky and L. Lundstrum carried out prospecting and soil sampling.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Schreiber-Hemlo

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - The following description of the Longworth Silver occurrence is taken from the Canadian Mining Journal (October 6, 1922): ...the vein is two feet in width at surface and is traceable for one and one half miles. It has been uncovered by stripping and trenching for a distance of 12 chains from the point of discovery. The silver is in the east wall of the vein, and occurs native, in leaf and nugget form, in quantity that runs into high values. There is a three inch streak of massive galena in the centre of the vein that assays from 34 to 70 ounces of silver per ton, and from $2.70 to $4.60 per ton in gold [0.135 to 0.23 oz/ton Au @ $20.00 gold]. Visible gold occurs in an eight inch vein of quartz on the west, or hanging wall. (Resident Geologist's Files, Schreiber Hemlo District, Thunder Bay) The Canadian Mining Journal (February 9, 1923, p.107) also states: An important discovery of native silver was made 1 1/2 miles (2.4 km) south of Schreiber in September 1922 on the Longworth Claim T.B. 3850, a re-staked portion of R 684. The silver occurs in calcite, galena and quartz veinlets in a brecciated zone 2 to 3 feet (0.6 0.9 m) wide with two well defined vertical fault walls striking 20 E of N. An open pit 24 feet (7.3 m) long, 15 feet (4.5 m) deep and 5 feet (1.5 m) wide has exposed two small lenses of 100 ounce silver ore 3 feet (0.9 m) long, 5 inches (12 cm) wide and 2 feet (0.6 m) deep....The enclosing rock is an altered diabase which has lamprophyre and aplite phases. Time was not taken to determine whether the diabase was a sill or a dyke. Under thin seciton the rock shows intergrowths of quartz and feldspar. On the shore of Lake Superior 1.6 km south of the Longworth Silver vein and in the strike of it is a highly altered Keewatin and rhyolite carrying galena and a little silver. (Resident Geologist's Files, Schreiber Hemlo District, Thunder Bay).

Lithology

Lithology Comments

Dec 07, 2005 (B Nelson) - The enclosing rock is an altered diabase which has lamprophyre and aplite phases.

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - From the Canadian Mining Journal (October 10, 1924): This vein is a brecciated structure and shows assays from 50 to 350 ounces of silver per ton. The following description of the Longworth Silver occurrence is taken from the Canadian Mining Journal (October 6, 1922): The silver is in the east wall of the vein, and occurs native, in leaf and nugget form, in quantity that runs into high values. There is a three inch streak of massive galena in the centre of the vein that assays from 34 to 70 ounces of silver per ton, and from $2.70 to $4.60 per ton in gold [0.135 to 0.23 oz/ton Au @ $20.00 gold]. Visible gold occurs in an eight inch vein of quartz on the west, or hanging wall. It is possible that the Longworth Silver vein represents the southern extension of the Morley High Grade Vein (Schnieders et al. 1996). Sampling by various companies returned values in the following ranges: trace to 0.52 oz/ton Au, nil to 100.42 oz/ton Ag, and up to 38% Zn, 11% Pb and 0.24% Cu.

Mineral Record Details

References

Journal - Canadian Mining Journal 1924 Oct

Publication Number: CMJ 1924 Page: 1018  Date: 1924

Author:

Publisher Name:

Location:

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:

Mono - Mineral Occurrences in the Nipigon-Marathon Area, Volumes 1 and 2.

Publication Number: OFR5951 Page: 509  Date: 1996

Author: Schnieders B.R., Smyk M.C., Speed A.A., McKay D.B.

Publisher Name: Ontario Geological Survey

Location:

Part - The southwestern part of the Schreiber area

Publication Number: ARV47-09.001 Page: 1-28  Date: 1998

Author: Harcourt G.A.

Publisher Name: Ontario Dept. of Mines

Location:

File - Resident Geologist Mineral Deposit Files

Publication Number: Min Dep Date:

Author:

Publisher Name:

Location: Thunder Bay RGP

Map - Geological series, Precambrian geology of the Schreiber area, east part, Thunder Bay District

Publication Number: P2391 Scale: 1:15,840    Date: 1981

Author: Carter M.W.

Publisher Name: Ontario Geological Survey

Location:

Map - Schreiber area, District of Thunder Bay, Ontario

Publication Number: ARM47J Scale: 1:31,680    Date: 1997

Author: Bartley M.W., Harcourt G.A.

Publisher Name: Ontario Dept. of Mines

Location:

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