Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42E04SW00005

Record: MDI42E04SW00005

General

Commodities

Primary Commodities: Copper, Gold

Secondary Commodities: Silver

Location

Township or Area: Cosgrave Lake Area

Latitude: 49° 7' 31.39"    Longitude: -87° 53' 19.81"

UTM Zone: 16    Easting: 435151.931   Northing: 5441774.889    UTM Datum: NAD83

Resident Geologist District: Thunder Bay South

NTS Grid: 42E04NW, 42E04SW

Point Location Description: Trenches, stipped areas, diamond drill holes.

Location Method: Conversion from MDI

Access Description: The Moschuk occurrence is located about 19 km east of the town of Nipigon and 17 km northeast along the Little Bear Quarry (Camp 81) Road (claim map G-12 and G-25, Blair Lake and Cosgrave Lake). Access is via the Little Bear Quarry Road which heads north, approximately 19 km east of Nipigon. The occurrence is approximately 17 km up the little Bear Quarry Road. Mineralization occurs on both sides of the Jackpine River. However, in high water seasons, crossing the river can be difficult. The majority of the trenches are on the east side of the Jackpine River.

Exploration History

1965: Asarco Ltd. conducted an IP Resistivity survey. 1968: Falconbridge Nickel Mines Ltd. conducted line cutting, geological mapping, trenching and chip sampling. 1969: Trenching and stripping performed by Costy Bumbu. 1971: Manual and mechanical work by R.W. Pitkanen and J.E. Halonen. Ardel Explorations Ltd. performed an induced polarization survey over the property and drilled one diamond drill hole of 163 m. 1989-1990: Noranda Exploration Co. Ltd. optioned the property from C. Bumbu and J. Martin; line cutting, mapping, soil geochemical and geophysical surveys and diamond drilling carried out. An airborne mag survey was also flown. 5 diamond drill holes totalling 499 m were reported (Lichtblau 1995). 1993: C. Bumbu conducted prospecting, trenching and sampling with assistance from an OPAP grant. 1995: J. Martin conducted stripping, trenching, prospecting and sampling with the aid of an OPAP grant. A report was written by A. Lichtblau of Ovalbay Geological Services Inc. 1995: The property is currently held by C. Bumbu and J. Martin.

Assessment Work on File

Geology

Province: Superior

Geological Age: Archean  

Geology Comments

Dec 07, 2005 (B Nelson) - A number of shallow pits have been dug on a number of laminated quartz veins on the east side of the Little Bear Quarry Road (Camp 81 Road). The area is underlain by granite, biotite gneiss, syenitic granite, pegmatite, gneiss and fine grained diabase dikes. Faulting is a common feature, with the most prominent fault system being the Jackpine River Glacier Creek fault, with a strike of approximately 20 degreesE. The Jackpine River Glacier Creek fault is a 50 km long fault structure which is shown to transect Proterozoic rocks in the south. A second and third fault system are present striking approximately 10 degreesE and 40 degreesW respectively. Copper mineralization is common along the Jackpine River Glacier Creek Fault. At least 5 copper-gold occurrences (Moschuk, Glacier Creek, Michon, Gunnex, Croon) have been discovered to date along this structure. Copper +/ gold mineralization was observed associated with quartz plus minor carbonate veins, veinlets, stringers, quartz stockworks and quartz flooded and breccia zones. Individual veins from less than 1 cm to greater than 1 m wide were observed. Copper mineralization was present over a strike length of at least 1 km and over widths of up to 70 m. Several mineralized zones are reported including the main zone along the Jackpine River plus several parallel zones up to 250 m to the east (East Showing, Trench 10). Lichtblau (1995) suggests there are two main bands of quartz veining and flooding, one '1m to 3m wide, that can be traced on surface 1.8 km at N20 degreesE, along the Jackpine River. A second, subsidiary, zone of veining and mineralization 50 m east of the main band has been followed 800 m along strike.' and 'A mineral elongation and plunge of minor folding of vein material was noted, dipping 78 degrees at N220 degreesE'. Lichtblau (1995) also suggest that Noranda geophysics has extended the potential for mineralization for at least 2.6 km.

Lithology

Mineralization

Mineralization Comments

Dec 07, 2005 (B Nelson) - The quartz varies from a white sugary texture to massive grey-glassy variety. The quartz is mineralized with cp, as blebs up to 1.2 cm diameter and as fine disseminations. Near massive cp concentrations were discovered by J. Martin while trenching in 1995. Py, minor bn and mc are common within the veins and veinlets. Barr (1989) stated that ' overall the mineralization constituted 0.5 to 1% volume but local concentrations of up to 40% were observed.' Dark green chlorite slickensides were observed on a number of quartz vein samples from the pits. The gold values appear to have a somewhat proportional relationship to the copper mineralization content. Lichtblau (1995) states: From what is known of the main and subsidiary zones, widths are minimal and Cu Au grades are low and erratic (<1.0 g/t Au; 1% to 2% Cu) although, high grade grab samples are common. The areas between zones, and between areas of quartz veining/flooding within individual zones are unaltered and unmineralized. (Resident Geologist's Files, Schreiber Hemlo District, Thunder Bay) Chips sampling by Falconbridge Nickel Ltd. assayed as high as 0.88% Cu across 6.5 feet. Samples collected by Resident Geologist personnel yielded results ranging from trace to 0.48 oz/ton Au, trace to 0.10 oz/ton Ag, and 0.22 to 8.85% Cu.

Mineral Record Details

Site Visit Information

Date: Feb 26, 1997

Geologist: B Nelson

Notes: Resident Geologist personnel visited the occurrence August 9, 1983, June 28, 1990, and August 17, 1995.

References

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:

Map - Red Rock-Pine Portage sheet, District of Thunder Bay, geological compilation series

Publication Number: P0357 Scale: 1:126,720    Date: 1997

Author: Pye E.G.

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

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

Publication Number: OFR5951 Date: 1996

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

Publisher Name: Ontario Geological Survey

Location:

Article - Schreiber-Hemlo Resident Geologist's District - 1990

Publication Number: MP152.007 Date: 1997

Author: Schnieders B.R., Smyk M.C., Hinz P.

Publisher Name: Ontario Geological Survey

Location:

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