Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI32E13NE00012

Record: MDI32E13NE00012

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Lower Detour Lake Area

Latitude: 49° 56' 49.03"    Longitude: -79° 39' 42.02"

UTM Zone: 17    Easting: 596018.002   Northing: 5533591.005    UTM Datum: NAD83

Resident Geologist District: Timmins

NTS Grid: 32E13NE

Point Location Description: Collar of DH 519-058 measured from UTM coord for hole CQ03-4

Location Method: Based on Assessment

Access Description: Access to the property is by fixed wing aircraft from Cochrane, or by all terrain vehicle form the Detour Lake Mine site. Detour Lake Mine is accessible by an all-season road from Cochrane.

Exploration History

1980-83: Western Mines Ltd./Westmin Res. - airborne and ground geophysics, mapping. 1994-97: Placer Dome Canada Limited - airborne and ground geophysics, diamond drilling. 1999-2004: Conquest Resources Limited/ Boliden Westmin (Canada) Limited - property optioned from Placer-Dome; drilling; geochemical surveys

Assessment Work on File

Geology

Province: Superior

Subprovince: Abitibi

Terrane: Wawa-Abitibi

Belt: Abitibi

Geological Age: Neoarchean  

Geology Comments

Mar 24, 2010 (D Draper) - The property claim package extends east-west across the central section of the Lower Detour Lake Area and was named the South Detour property by Placer Dome and later the Aurora property by Conquest. It is located within the Abitibi Subprovince at the contact between the Abitibi greenstone terrain and the Migmatitic Opatika Subprovince. The property is situated on the southern flank of a synclinal fold structure that extends from the main body of the Abitibi belt in Quebec. The centre of the fold consists mostly of metasediments flanked by metavolcanics. The geological setting is in some ways similar to the Detour Lake property to the northwest in Sunday Lake Area. Thick sequences of massive to pillowed tholeiitic basalt flows contain interflow units consisting of mafic tuffs, greywackes and local chemical sediments. Gabbroic bodies and numerous feldspar porphyry and quartz-feldspar porphyry dykes intrude these sequences. Regional dynamothermal metamorphism, increasing to the west of the property, has resulted in recrystallization and deformation fabrics. Later thermal metamorphism, related to batholith intrusion on the southern edge of the claims, has locally overprinted the regional fabrics. According to the classification adopted by Winkler (1979), the rocks at South Detour would be classified as upper greenschist facies in the eastern portion of the property, to lower amphibolite facies to the west, with amphiboles being the dominant metamorphic mineral. Rocks proximal to the batholith intrusion on the southern edge of the property or the felsic intrusion to the northeast, are hornfelsed with epidote-garnet (almandine?) +I- albite being the diagnostic contact metamorphic mineral assemblage. (adapted from B. Pierna report, Oct. 1997 in T-3436 (2.18222), p.14)

Lithology

Lithology Comments

Dec 07, 2005 (A Wilson) - Gold mineralization on this zone is hosted within a thick, north-dipping mafic tuff horizon associated with cherty sections and intercalated with some minor pillowed and massive flows. Both the tuffs and flows have been intruded by a series of felsic dikes.

Mineralization

Mineralization Comments

Mar 24, 2010 (D Draper) - Anomalous gold concentrations in hole 519-058 occur mainly in the flows in the hangingwall to the gold-bearing tuff-chemical sediment. Deformed pillowed flows at the top of the hole returned 1.03 g/t Au over 1 m at 17m. Locally potassically altered massive mafic flows assayed 2.67 g/t Au over 1m at 89m. The flows are cut by several plagioclase porphyritic felsic dykes. Multiple specks of gold are visible in a tuff-chemical sediment from 118.40 to 123m, which assayed 6.74 g/t Au over the entire unit of 4.6 m. This gold zone includes assays of 7.17 g/t Au over 0.60m at 118.40m, 19.88 g/t Au over 1m at 119m and 9.12 g/t Au from 120 to 121m. Gold enrichment in the pillowed flows in the footwall to the tuff-chemical sediments is patchy and assayed 0.54 g/t Au from 161 to 162m. (Precis of B. Pierna report, Feb. 1997 in T-3436 (2.18114), p.22) Sludge assays for 519-058 also returned anomalously high values for silver, copper and molybdenum. Followup drilling in 1997 consisted of 2 holes: 519-070, collared 45m south of 519-058, and 519-084, collared 25m north of it. Hole 519-070 returned assays up to 2.4 g/t Au over 1m from the gold-bearing tuffaceous zone which was intersected 70m vertically above the intersection in 519-058. Hole 519-084 was drilled beneath 519-058, intersecting the tuff zone approximately 70m vertically deeper. Here quartz veins, mineralized with po, py, marcasite and VG, assayed 3.84 g/t Au over 6m, including a 1-metre section of 16.49 g/t Au. 1997 drilling also included hole 519-071, which was collared 200m west of 519-084 and assayed 0.60 g/t Au over 3m of a tourmaline-bearing, quartz-feldspar porphyry. (T-3436) Best assay results from Conquest's drilling in 2003: CQ03-5, collared 15m north of 519-058, returned 11.17 g/t Au over 0.25m and 0.74 g/t Au over 1.5m in mafic tuff; CQ03-2, collared 25m east of 519-058, returned 969 ppb Au over 0.5m, also in a unit of mafic tuff. (T-4882) In 2004, four holes drilled to the south and west of 519-058 by Trade Winds/Conquest JV returned the following gold values: TWCQ-001 - collared 130m to south, assayed 2.64 g/t over 1m and 8.77 g/t over 1.15m; TWCQ-002 and -003 - co-collared 230m to south, assayed 1.12 g/t over 5m and 0.816 g/t over 1.05m respectively; TWCQ-007 - collared 210 m to the west, assayed 3.52 g/t over 0.25m. Visible gold was observed in holes TWCQ-002 and TWCQ-007. Mineralization noted in all 4 holes included py, po, cpy; in addition, sphalerite, arsenopyrite, tourmaline and tetrahedrite were reported in TWCQ-003. (T-5827)

Alteration Comments

Mar 24, 2010 (D Draper) - The gold bearing tuff zone intersected in hole 519-058 exhibited strong and pervasive potassic alteration.

Mineral Record Details

References

Map - Burntbush-Detour lakes, Cochrane District

Publication Number: M2453 Scale: 1:100,000    Date: 1982

Author: Johns G.W.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Geology of the Burntbush-Detour lakes area, District of Cochrane

Publication Number: R199 Date: 1982

Author: Johns G.W.

Publisher Name: Ontario Geological Survey

Location:

Map - Geological Compilation of the Burntbush-Detour Lakes Area, Abitibi Greenstone Belt

Publication Number: P3609 Scale: 1:100,000    Date: 2009

Author: Ayer J.A., Chartrand J.E., Duguet M., Rainsford D.R.B., Trowell N.F.

Publisher Name: Ontario Geological Survey

Location:

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For detailed information regarding this mineral record please contact the Timmins Resident Geologist District Office