Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52P16SW00011

Record: MDI52P16SW00011

General

Commodities

Primary Commodities: Gold

Secondary Commodities: Silver

Location

Township or Area: Keezhik Lake Area

Latitude: 51° 46' 7.23"    Longitude: -88° 28' 5.58"

UTM Zone: 16    Easting: 398690   Northing: 5736330    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52P16SW

Point Location Description: Diamond drill hole

Location Method: Conversion from MDI

Access Description: Located on Keezhik Lake, 38 km northwest of Fort Hope First Nation (south shore of narrows to the East Arm, Keezhik Lake. Accessible by float plane or helicopter.

Exploration History

1971: AEM - AM surveys - Cominco. 1977-1979: Standard Mines carried out trenching and diamond drilling. 1984: preliminary report for J. Ternowesky by J. Hinzer. 1987: lining cutting, geol. mapping, 14 ddh, humus geochem. ground mag., ground VLF-EM, HLEM, IP/res., AM, and VLF-EM. - Noramco Exploration Inc. on behalf of Pure Gold Resources and Severide Resources. 2004-2005: Prospecting, geological mapping and assays by MetalCorp

Assessment Work on File

Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Miminiska-Fort Hope

Geological Age: Mesoarchean  

Geology Comments

Dec 07, 2005 (C Salo) - The Keezhik Lake area is underlain by east-trending mafic to felsic metavolcanic rock, including both flow and tuffaceous rocks. Banded magnetite iron formation is intercalated with the metavolcanic rocks. Minor metasedimentary rocks area pres. Hornblendite, gabbro, diorite, quartz porphyry and felspar porphyry intrude the metavolcanic rocks. Precambrian diabase dikes intrude the Archean rocks. Silicified mafic metavolcanic rocks are intruded by felspar porphyry. Lapilli tuff and breccia xenoliths occur in a circular porphyry body and are clast-supported pyroclastic rock. The feldspar porphyry is weakly foliated. A northeast-trending foliation is exhibited in the porphyry and the metavolcanic rocks in the form of preferred development of sericite and chlorite. The foliation is overprinted by a northwest-trending fracture cleavage which host narrow quartz veins. Mineralization pervasive throughout much of the porphyry stock. Trace amounts of molybdenite, scheelite and sphalerite with gold associated with three alteration zones. K-alteration, sericite-carbonate alteration, and silicification.

Lithology

Lithology Comments

Dec 07, 2005 (C Salo) - Silicified mafic metavolcanic rocks are intruded by felspar porphyry. Lapilli tuff and breccia xenoliths occur in a circular porphyry body and are clast-supported pyroclastic rock. The feldspar porphyry is weakly foliated. A northeast-trending foliation is exhibited in the porphyry and the metavolcanic rocks in the form of preferred development of sericite and chlorite.

Mineralization

Mineralization Comments

Oct 06, 2006 (Mark Puumala) - The KL-12 zone is hosted within a 2.5 to 3 km diameter felsic porphyritic stock that is described by Arnold and MacTavish (2005) as a fine- to medium-grained, light green, inequigranular, weakly to moderately foliated, moderate to strongly carbonatized, non-magnetic, pyrite-bearing felsic quartz +/- feldspar porphyry with a massive to weakly foliated biotite granite core. The most significant mineralized zones are associated with a silicified shear zone oriented approximately 200/65. This shear contains boudinaged, white to smoky grey quartz veins that are mineralized with pyrite, galena, scheelite and visible gold. The silicified shear is located within a broader zone of sericite and carbonate alteration. Arnold and MacTavish (2005) suggest that the gold mineralization is associated with decreased carbonatization and increased silicification. The blue-grey silicification is commonly associated with accessory galena, molybdenite, scheelite, tourmaline, arsenopyrite and hornblende (Taylor 1988 and Winter 1988). According to Taylor (1988), drilling carried out by Noramco and Severide in the late 1980s delineated two economically significant zones within a 450 m strike-length zone of anomalous gold values. These mineralized zones are referred to as sub-zones KL-12A and KL-12B. Sub-zone 12A was intersected by four drill holes, has a strike length of at least 80 m and is open to the east and at depth. The best reported assay in this zone was 47.65 g/t over 0.6 m in DDH KL-12. Sub-zone KL-12B has a strike length of at least 100m and is open to the west and at depth. The most favourable assay from this zone was 25.78 g/t over 1.2 m in DDH KL-71. Significant gold values (up to 2.89 g/t over 1.6 m) were also reported in assays from Noramco/Severide drill hole KL-60, located approximately 350 m NNW of KL-12. These values were associated with narrow veins of milky white quartz (Taylor 1988). Arnold and MacTavish (2005) reported the discovery of five additional surface gold showings (String 1 to String 5) in an area extending approximately 600 m to the west of KL-12 within the Porphyry stock. These showings are associated with white to grey quartz stringers, veinlets and veins. Grab sample assay results of between 1005 and 2948 ppb Au were reported from these new surface occurrences.

Sep 27, 2019 (Therese Pettigrew) - The eleven diamond drill holes completed on zone KL-12 all intersected broad areas of anomalous gold associated with pyrite mineralization and silica-sericite-carbonate alteration in a feldspar porphyry stock. Within this alteration system, two zones, 12A and 12B having economic significance, are identified. Zone 12A with a strike-length of 80 m is open to the east and at depth. Four holes have intersected the zone with results as follows: 47.65 g/t over 0.6 m in hole KL-12; 2.62 g/t over 1.4 B in KL-57; 8.05 g/t over 1.4 m in KL-58 and 1.29 g/t over 1.0 m in KL-72. Zone 12B has been intersected by four holes as follows: 5.97 g/t over 1.5 m in KL-58; 2.42 g/t over 0.2 m in KL-64; 18.96 g/t over 1.2m in KL-70 and 25.78 g/t over 1.3 B in KL-71. This zone, with a strike-length of 100 m, is open to the west and at depth. An intersection of 4.4 g/t over 3.0 m in KL-75 may be the eastward extension of Zone 12B. Hole KL-60, testing a humus geochemical anomaly, intersected a number of narrow quartz veins with significant gold contents Including 2.89 g/t over 1.6 m (Assessment report 52P16SW0002). Sampling by MetalCorp in 2005 returned values of 1.226 to 16.542 ppm Au (Assessment report 20000000915). Sample 10311, located 550 m to the west of KL-12, returned an assay of 148.0 g/t Au and 8.2 ppm Ag from a channel sample across a 3 cm wide quartz vein, without visible mineralization, hosted in a medium-grained quartz-feldspar porphyr near the north shore of the Keezhik peninsula (Assessment report 20000007917).

Alteration Comments

Dec 07, 2005 (C Salo) - Gold associated with three alteration zones: K-alteration, sericite-carbonate alteration, and silicification. These alteration types overlap and the relationship between them unclear.

Mineral Record Details

References

Map - Keezhik-Miminiska lakes area, District of Kenora (Patricia Portion), Ontario

Publication Number: ARM48E Scale: 1:63,360    Date: 1997

Author: Prest V.K.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Mineral Occurrences and Prospects in the Fort Hope-Winisk Area

Publication Number: OFR5926 Scale:     Date: 1995

Author: Mason J.K., White G.D.

Publisher Name: Ontario Geological Survey

Location:

Part - Geology of the Keezhik-Miminiska lakes area

Publication Number: ARV48-06 Scale:     Date: 1998

Author: Prest V.K.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Operation Fort Hope, Lansdowne House-Fort Hope sheet, districts of Kenora (Patricia Portion) and Thunder Bay

Publication Number: P0562 Scale: 1:126,720    Date: 1997

Author: Thurston P.C., Carter M.W.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Operation Fort Hope

Publication Number: MP042 Scale:     Date: 1970

Author: Thurston P.C., Carter M.W.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

Map - Fort Hope-Lansdowne House sheet, geological compilation series, Cochrane, Kenora, and Thunder Bay districts

Publication Number: M2237 Scale: 1:253,440    Date: 1972

Author: Thurston P.C., Carter M.W., Riley R.A.

Publisher Name: Ontario Dept. of Mines and Northern Affairs

Location:

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