Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000000158

Record: MDI000000000158

General

Commodities

Primary Commodities: Gold

Location

Township or Area: Frond Lake Area

Latitude: 51° 36' 22.52"    Longitude: -88° 23' 20"

UTM Zone: 16    Easting: 403820   Northing: 5718160.01    UTM Datum: NAD83

Resident Geologist District: Thunder Bay North

NTS Grid: 52P09SW

Point Location Description: Location obtained from assessment file map.

Location Method: Data Compilation

Exploration History

1981: Gallion Resources Ltd. conducted HLEM, VLF-EM and magnetometer surveys. 2002 - 2006: Landore Resources carried out an exploration program on properties that cover the area between Miminiska and Goss Lakes. This work includes geological and geophysical compilation, geological mapping, prospecting, diamond drilling and assays.

Assessment Work on File

Geology

Province: Superior

Subprovince: Uchi

Terrane: North Caribou

Domain: Uchi

Belt: Miminiska-Fort Hope

Geological Age: Neoarchean  

Geology Comments

Oct 11, 2006 (Mark Puumala) - The rocks of the Wottam Lake area are dominated by a thick sequence of metasedimentary rocks described by Wallace (1981) as predominantly monotonously intercalated wacke and mudstone. This sedimentary sequence also contains numerous horizons of oxide, carbonate and/or silicate facies iron formation. Some of these iron formation units have considerable thickness (i.e., up to 150 m), with the most notable iron formation being located at the eastern end of Miminiska Lake. This iron formation thins considerably toward the northeast, and several thinner (typically <10 m) iron formation horizons have been mapped to the south (Needham 2005). The metasedimentary sequence conformably overlies a thick, predominantly mafic metavolcanic sequence that is located to the south. A second predominantly mafic metavolcanic rock sequence interpreted by Wallace (1981) to overlie the metasedimentary rocks has also been mapped to the north. A number of large felsic intrusions occur to the north (Cluff Lake Stock, South Bay Stock and Troutfly Lake Batholith) and south (Kawitos Lake Batholith) of these supracrustal sequences. Mapping by Wallace (1981) indicates that sedimentary bedding in the Wottam Lake area typically strikes in an east-northeasterly direction, with moderate to steep northward dip. Further west, in the vicinity of Miminiska Lake, bedding stikes approximately east-west with near-vertical dips. A number of approximately easterly-trending isoclinal folds are interpreted by Wallace (1981) to occur within the metasedimentary sequence. These include a synclinal structure with an axial trace that passes through Wottam and Goss Lakes, and a second syncline with an axial trace that extends from an area north of Miminiska Island toward Seagreen Lake. Needham (2005) has has indicated that strong foliation is present at numerous locations throughout the Wottam Lake area. The foliation is typically parallel to sedimentary bedding, with dips ranging from 50 to 80 degrees to the north. However, it was locally observed to be 10 to 20 degrees oblique to bedding. Notable locations with strong foliations include the northern sedimentary/volcanic contact and an area approximately 200 to 300 m north of Wottam Lake associated with the WSaspy3 (International) occurrence. Outcrop-scale isoclinal folds and localized arsenopyrite mineralization are commonly observed in the strongly foliated sedimentary rocks. A number of major northeast-striking faults paralleling Ferguson Creek have also been mapped in the area by Wallace (1981). Needham (2005) indicates that gold in this area is typically associated with axial planar shear zones mineralized with pyrrhotite, pyrite and arsenopyrite. The host rock is typically strongly foliated/sheared magnetite bearing silicate to oxide iron formation.

Lithology

Mineralization

Mineralization Comments

Oct 11, 2006 (Mark Puumala) - The WSaspy1 occurrence is located within a sulphide-beraing iron formation unit that was mapped and sampled by Needham (2003). The majority of outcrop exposure in the vicinity of this showing is a mixture of silicate, oxide and sulphide iron formation. This iron formation also contains interbedded slate and greywacke. An isoclinal fold has been mapped in this area. Thin (<10 cm wide) shears were noted parallel to the axial plane (northeast striking) of this fold. The iron formation shows localized evidence of replacement of magnetite by pyrrhotite. The iron formation contains abundant quartz veining, with some of these veins reported to be folded. The quartz is also reported to have a recrystallized appearance. Semi-massive pyrrhotite +/- arsenopyrite mineralization was observed in the southernmost of two sulphide iron formation horizons. The best assay obtained from this material was 0.51 g/t Au.

Mar 29, 2021 (Therese Pettigrew) - Sample 11sb320-2 returned 3.73 ppm Au from veins with 5-6% pyrite, minor chalcopyrite, and possible arsenopyrite, hosted in oxide and sulphide iron formation (MRD293).

Mineral Record Details

References

Map - Wottam Lake, Kenora and Thunder Bay districts

Publication Number: M2417 Scale: 1:31,680    Date: 1979

Author: Wallace H.

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Geology of the Miminiska Lake area, districts of Kenora (Patricia Portion) and Thunder Bay

Publication Number: R214 Scale:     Date: 1981

Author: Wallace H.

Publisher Name: Ontario Geological Survey

Location:

Data - Geochemical and Geological Data from the Keezhik Lake and Miminiska Lake Area, Fort Hope Greenstone Belt, Northwestern Ontario

Publication Number: MRD293 Scale:     Date: 2012

Author: Buse S.

Publisher Name: Ontario Geological Survey

Location:

Map - Precambrian Geology of the Miminiska Lake Area, Fort Hope Greenstone Belt

Publication Number: P3764 Scale: 1:50,000    Date: 2012

Author: Buse S.

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