Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI52F05SW00005

Record: MDI52F05SW00005

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Dogpaw Lake Area

Latitude: 49° 20' 45.58"    Longitude: -93° 49' 12.69"

UTM Zone: 15    Easting: 440426   Northing: 5466243    UTM Datum: NAD83

Resident Geologist District: Kenora

NTS Grid: 52F05SW

Point Location Description: From AMIS

Location Method: Conversion from MDI

Exploration History

1901: prospector conducted trenching. Flint Lake Gold Company acquired the property 1902: two shafts were sunk and a plant was erected. 1903: Mill was never put into use and work was abandoned. 1931: F. McCallum conducted trenching near the shore of Flint Lake. 1973: C. Kuryliw conducted geological mapping, sampling, and a magnetometer survey. 1980: Noranda Mines Ltd. conducted geological mapping, linecutting, and magnetometer and IP surveys. 1984: Micham Exploration Inc. conducted geological mapping and prospecting. 1986: Nuinsco Resources Ltd. drilled 4 DDH totalling 165.5 m. 1997: Avalon Ventures Ltd. conducted geological mapping, sampling and a ground magnetometer survey. 2004: Cunniah Lake conducted sampling. 2010: Metals Creek Resources conducted geological mapping, sampling, and IP and resistivity ground geophysical surveys.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wabigoon

Belt: Kakagi-Rowan Lakes

Geological Age: Archean  

Geology Comments

Aug 25, 2017 (Therese Pettigrew) - The Flint Lake Prospect Fault Zone (FLPFZ) is the host of the Flint Lake occurrence. It has been observed at the Flint Lake occurrence and at its NW strike extension where it extends through Caviar Lake. At both sites, there is evidence of moderate to strong shearing within the mafic volcanic flows (AFRI 52F05SW2001).

Lithology

Lithology Comments

Aug 25, 2017 (C Ravnaas) - The mineralized quartz-ankerite vein stockwork is contained within a strongly sheared and ankerite carbonatized mafic volcanic flow. The shearing dissipates within meters of the shaft area, however, disseminated ankerite alteration beyond the core shear zone suggests that subtle shearing and/or related small scale shear zones and fault zones continue for some distance from the main structure.

Mineralization

Mineralization Comments

Aug 25, 2017 (C Ravnaas) - GRADE: BEST ASSAY - 0.5 OPT AU ACROSS 1.5 M. There are an adit, two vertical shafts and some trenches developed on an average 3 m wide zone of quartz-ankerite veins within a pervasively ankerite carbonatized, sheared mafic volcanic flow. There are varying concentrations of disseminated and locally stringer pyrite, and local disseminated flakes of fuchsite. Limited sampling from this occurrence obtained values up to 785 ppb Au (grab sample 239221). Simunovic (1984) refers to historic values ranging up to 0.40 oz/ton Au from the Flint Lake occurrence (AFRI 52F05SW0074) and follow-up sampling by Micham Exploration Inc. includes values of up to 7.66 oz/ton Au from 'cobbed ore' in the high grade dump adjacent to the shafts (AFRI 52F05SW0038). Shallow drilling completed by Micham beneath the adit did not obtain any significant gold values. The prospect pinches out to the southeast and trends beneath a swamp to the northwest. Additional, subparallel mineralized zones are indicated by mapping and sampling completed by Micham on the west shore of Corbett Lake. Mapping by Avalon Ventures Ltd. in 1997 delineated strongly sheared and ankerite carbonatized mafic volcanic flows within a bay on the other side of the swamp that covers the northwest extension of the Flint Lake Prospect. It is possible that additional exploration potential exists along strike from the Flint Lake Prospect, and along the subparallel zones to the north within the CLP (AFRI 52F05SW2001).

Aug 25, 2017 (Therese Pettigrew) - Chip samples collected in 1973 from the original shaft area obtained values of up to 0.32 oz/t Au over 2 ft. Grab samples collected in 1986 from the 1902 stockpile obtained values of up to 7.66 oz/t Au. The zone is reported to be 1.2 km long. Shaft 1 is 8 m deep, Shaft 2 is 4.5 m deep (Beard and Garratt, 1984). Pyrite and chalcopyrite were reported associated with the gold in quartz veins intrusive into carbonatized basalt (Davies and Morin, 1976). The quartz veins strike S70E and dip toward the SW (Burwash, 1934). The highest assays from the 2010 Metals Creek sampling program were 10.663 g/t, 18.233 g/t, 32.505 g/t, 59.350 g/t, 60.639 g/t, 68.865 g/t and 112.467 g/t Au (AFRI 20000007165). During Cunniah Lake’s 2004 sampling program, 14 grab samples were taken, including 3 from the ore stockpile. The 3 samples from the stockpile returned values from 0.605 to 38.036 ppm Au and the other assay values ranged from below detection limit to 3.262 ppm Au (AFRI 52F05SE2006).

Alteration Comments

Aug 25, 2017 (Therese Pettigrew) - All the high strain zones delineated during mapping contain weak to strong, structurally controlled carbonate +/- sericite +/- chlorite alteration within schistose to phyllitic rocks. Quartz and/or ankerite veins are also common within areas that are strongly altered. All rock types within the Cedartree Lake Property area, with the exception of the late Archean diabase dikes, exhibit some degree of structurally controlled hydrothermal alteration. The tuffaceous sequences typically alter to sericite +/- carbonate +/- chlorite schist, except where adjacent to mafic-ultramafic sills, where there is significantly more pervasive chlorite alteration. The mafic-ultramafic sills typically alter to chlorite +/-carbonate schist. The mafic volcanic flows of the Rowan Lake Group typically alter to chlorite +/- carbonate +/- sericite schist. There is a distinct carbonate zonation to the alteration assemblages. Most structures contain a peripheral 'halo' of calcite-carbonate alteration. The carbonate alteration occurs as < 2 cm thick veins in conjugate sets within moderate to strongly fractured host rock (outer brittle fabric associated with brittle-ductile environments). The calcite veins grade inwards toward the core of the alteration into pervasive calcite alteration then pervasive ankerite alteration, generally accompanied by an increase from weak to strong pervasive sericitization and/or chloritization. Ankerite alteration, in the core of the alteration assemblages, occurs as pervasive replacement, as stringer veins typically <2 cm thick, and as rhombohedral porphyroblasts (AFRI 52F05SW2001).

Mineral Record Details

References

MonoMap - Geology of the Cedartree Lake area, District of Kenora

Publication Number: R134 Scale:     Date: 1976

Author: Davies J.C., Morin J.A.

Publisher Name: Ontario Division of Mines

Location:

Mono - Gold deposits of the Kenora-Fort Frances area, districts of Kenora and Rainy River

Publication Number: MDC016 Scale:     Date: 1976

Author: Beard R.C., Garratt G.L.

Publisher Name: Ontario Division of Mines

Location:

Part - Geology of the Kakagi Lake area

Publication Number: ARV42-04.002 Scale:     Date: 1998

Author: Burwash E.M.

Publisher Name: Ontario Dept. of Mines

Location:

Map - Cedartree Lake, Kenora District

Publication Number: M2319 Scale: 1:31,680    Date: 1975

Author: Davies J.C., Morin J.A.

Publisher Name: Ontario Division of Mines

Location:

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