Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000001274

Record: MDI000000001274

General

Commodities

Primary Commodities: Molybdenum

Secondary Commodities: Copper, Silver

Location

Township or Area: Crescent Lake Area

Latitude: 50° 25' 43.1"    Longitude: -88° 25' 1.47"

UTM Zone: 16    Easting: 399350   Northing: 5587250    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52I08

Point Location Description: Point located from maps by Linear Metals

Location Method: Data Compilation

Access Description: The KM61 property is located 230 kilometres north-northeast of Thunder Bay, Ontario. The property is accessible from Thunder Bay by taking the Trans-Canada Highway (highway 11) five kilometres east to provincial highway 527, then driving north for 250 kilometres to the town of Armstrong. The KM61 Project claim group is located between approximately kilometre 59 to kilometre 65 of the Jackfish haulage road. The road has been well maintained by Buchanan Forest Products (Buchanan). Buchanan has no plans to maintain the road beyond the first quarter of 2009, however, and individual stakeholders in the region (e.g. Linear Metals, Landore Resources Limited, the Whitesand First Nations Band, and Ontario Power Generation) will have to take on maintenance.

Exploration History

At various times and in different phases beginning in the early 1950s, the Caribou belt has been prospected for magmatic Cu-Ni sulphide, lode gold, rare element pegmatites, such as at Linear’s adjoining Seymour Lake Project, and volcanogenic massive sulphides. Recent access to the area for prospecting has been greatly enhanced by logging activities. 2001: Linear Gold optioned the Aubrey Occurrence from the Stares brothers. The KM61 showing was discovered by Linear Gold in 2002 during regional prospecting on the Seymour Lake tantalum property. KM61 was initially evaluated by a limited trenching and sampling program which returned significant values of copper, molybdenum, silver and gold from grab and channel samples. The property was subsequently optioned to Noranda Inc. (later Falconbridge and now Xstrata PLC) which maintained the option from December 2003 to December 2006 when Xstrata returned the project to Linear Metals (Linear Metals had acquired the rights to KM61 from Linear Gold in April 2006). Noranda conducted exploration programs at KM61 each summer during 2003, 2004, and 2005. In 2003, a grid with 400 metre line spacing was mapped, soil sampled, and an IP survey was conducted. Additionally, channel sampling was undertaken in the Linear trenches. In 2004, Noranda completed a 5 DDH, 1,178 metre drill program in the trenched area on the SW end of the porphyry system. In 2005 Falconbridge completed another 9 DDH, 2,039 metre drill program stepping out to the NE to more extensively test the remaining IP and soil anomalies. The Noranda-Falconbridge program partially tested an area measuring approximately 1200 by 600 metres. 2007: Linear Metals conducted an exploration program that included trenching, line cutting, IP surveying, soil sampling and drilling 15 DDH totalling 4990 m. 2008: Linear drilled 84 DDH totalling 28,627 m, conducted trenching and mapping, and contracted a fixed-wing airborne magnetic and radiometric survey. 2009: Linear releases a NI 43-101 report on the property. 2012: Linear changed its name to Stockport Exploration Inc.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Caribou Lake

Geological Age: Archean  

Geology Comments

Jun 16, 2011 (N Bennett) - The disseminated and vein-type molybdenite-chalcopyrite mineralization at KM61 is hosted by two northeast-trending, quartz monzonite porphyry dyke swarms and their flanking mafic metavolcanics. These porphyries and their wall rocks are extensively stock-worked with quartz and quartz-sulphide veins, and host disseminated chalcopyrite and molybdenite over a drill-indicated total width of 350 metres, and over a drill-indicated strike length measuring 1,600 metres. At an arbitrary cut-off of 0.04% molybdenum, the mineralized zone is up to 350 metres wide, flanked by zones of lower grade mineralization (0.01 to 0.04% molybdenum). Based on age and metal ratios, Moly Mines’ Spinifex Ridge deposit is a potential model for KM61. Spinifex Ridge, located in Western Australia, and KM61 are both hosted by Archean porphyries and metavolcanic rocks and the bulk tonnage zones have similar metal ratios. Spinifex Ridge has a published measured plus indicated resource of 469 million tonnes at 0.058% molybdenum, 0.09% copper and 1.7 grams per tonne silver. The KM61 project does not have a resource estimate completed, but the grades experienced in drilling on the Main Zone thus far are comparable to those reported at Spinifex Ridge, with the KM61 zones carrying 0.04 to 0.08% molybdenum, 0.05 to 0.2% copper, and 2 to 7 grams per tonne silver. The low grade bulk tonnage model for KM61 is clearly an attractive one in the current molybdenum market.

Lithology

Lithology Comments

Jun 16, 2011 (N Bennett) - The KM61 property is located in the Caribou Greenstone Belt, which trends ENE along the top of Lake Nipigon, near the northern margin of the Wabigoon subprovince. A prominent SW-trending portion of the belt wraps around the NW end of a large composite felsic pluton in the property area. The Linear Metals claim group covers a large (1 km x 7 km) lensoid-shaped contact zone between the pluton to the south and metabasalts to the north. Although mineralization has not been dated by isotopic methods, the porphyry bodies and associated mineralization are assumed to be related to the large pluton, indicating a mid to Late Archean age.

Mineralization

Mineralization Comments

Jan 23, 2015 (Therese Pettigrew) - The Main Zone at KM61 extends over a strike length of 1.55 km and to a maximum width of 275 m. It forms a hull shape with a central keel extending to a depth of 500 m. Mineralization and alteration are typically hosted by quartz monzonite porphyry and the mafic volcanic country rock. Four mineralized porphyry phases have been identified, all with similar composition but with differing phenocryst types and sizes. The porphyry system is typified by mineralized quartz stockwork veining. The main vein direction trends parallel or subparallel to the porphyry dyke contacts and general foliation (approximately 060° to 070°) in a unidirectional sheeted system or with a complementary vein set trending 090° to 100°. Preliminary work suggests that at least five different generations of quartz veins occur, three major and two minor. The porphyry system is typified by mineralized quartz stockwork veining. The main vein direction trends parallel or subparallel to the porphyry dyke contacts and general foliation (approximately 060° to 070°) in a unidirectional sheeted system or with a complementary vein set trending 090° to 100°. Preliminary work suggests that at least five different generations of quartz veins occur, three major and two minor. Scheelite occurs in the veins as a minor constituent, but where analyzed, rarely exceeds 100 ppm tungsten, with maximum values of approximately 1,000 ppm locally. Petrography indicates a variety of minor silver-bearing bismuth-selenium-tellurium minerals, although the metallurgical work does not show high levels of any of these elements in the concentrates (2009 NI 43-101 report).

Mineral Record Details

Mineral Zones - Size and Shape

References

Mono - Report of Activities 2010, Resident Geologist Program, Thunder Bay North Regional Resident Geologist Report: Thunder Bay North District

Publication Number: OFR6262 Date: 2011

Author: Smyk M.C., White G.D., Lockwood H.C., Bennett N.A.

Publisher Name: Ontario Geological Survey

Location:

Publication - Technical Report on the KM61 Project, Ontario, Canada

Publication Number: 2009 43-101 Date: 2009

Author: Ross, D.A.

Publisher Name:

Location:

Map - Precambrian Geology of the Caribou Lake Greenstone Belt, Northwestern Ontario

Publication Number: P3613 Scale: 1:50,000    Date: 2009

Author: MacDonald C.A., ter Meer M., Lowe D., Isaac C., Stott G.M.

Publisher Name: Ontario Geological Survey

Location:

Map - Crescent Lake area, Thunder Bay District

Publication Number: M2100 Date: 1997

Author: Pye E.G.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Geology and Tectonostratigraphic Assemblages, eastern Wabigoon Subprovince, Ontario

Publication Number: P3449 Scale: 1:250,000    Date: 2002

Author: Stott G.M., Davis D.W., Parker J.R., Straub K.H., Tomlinson K.Y.

Publisher Name: Geological Survey of Canada, Ontario Geological Survey

Location:

Map - Compilation series, Mojikit Lake sheet, Thunder Bay District

Publication Number: P0267 Scale: 1:126,720    Date: 1997

Author: Stott G.M., McConnell C.D., Mason J.K.

Publisher Name: Ontario Geological Survey

Location:

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