Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI42C08SW00177

Record: MDI42C08SW00177

General

Commodities

Primary Commodities: Kimberlite

Location

Township or Area: Riggs

Latitude: 48° 18' 59.38"    Longitude: -84° 16' 22.28"

UTM Zone: 16    Easting: 702176.51   Northing: 5355072.85    UTM Datum: NAD83

Resident Geologist District: Sault Ste. Marie

NTS Grid: 42C08SW

Point Location Description: Drill collar for DDH 97-34

Location Method: Data Compilation

Access Description: Access to the area is via the Lochalsh Road. Follow the old Goudreau Road from the junction of the old and new Goudreau roads for approximately 7 km to the Jacobson Township turnoff. Follow the Lochalsh Road for approximately 10 km. Take the Godin Lake Road for about 1.5 km to the site.

Exploration History

1997-2000: Pele Mountain Resources - diamond drilling (5 ddh); 9 kg of drill core submitted to De Beers for analysis, early 2000 confirmation of kimberlite.

Assessment Work on File

Geology

Province: Superior

Subprovince: Wawa

Terrane: Wawa-Abitibi

Belt: Michipicoten

Geological Age: Archean  

Geology Comments

Sep 24, 2016 (A Wilson) - The occurrence lies within the Eastern Domain of the Goudreau Lake Deformation Zone. The GLDZ is up to 4.5 km in width and strikes in a gentle sigmoid-form for at least 30 km, subparallel to the stratigraphy and the regional foliation. In the immediate Goudreau-Lochalsh area, the GLDZ is coincident with a major contact between Cycle 2 and Cycle 3 volcanics. There is a strong structural control of the gold-bearing quartz veins systems within each of the 070-075 striking high-strain zones within the deformation zone. The Eastern Domain of the GLDZ is 9 km long and 2 km wide and contains narrow brittle and brittle-ductile high-strain zones displaying dextral, oblique slip displacement. Mineral lineations at the Cline Lake area have a consistent shallow plunge to the east and become moderately to steeply plunging in the Godin Lake area. Within the eastern domain, high-strain zones (as well as laminated, quartz-tourmaline and/or quartz-Fe-carbonate veins, fractures and felsic porphyry dikes) are dominantly parallel or at low angles to the east-striking regional foliation. The eastern domain is truncated on the west by the NW-trending Maskinonge Lake Fault.

Lithology

Lithology Comments

Sep 24, 2016 (A Wilson) - A flat-lying kimberlite dike was intersected at depth. It is described as a lamprophyre in the drill logs. It is black in colour, biotite rich and fine-grained. Some descriptions identify a reddish colouration to the dike. Analysis of the dike by De Beers revealed 28 garnets from 9 kg of core, of which 26 are G9 and the remaining 2 are G-10 type garnets. Several of the probed spinel grains fall within the diamond inclusion field. The majority of the spinels are considered to be mantle derived. The clinopyroxene that was probed all plot within the vicinity of garnet-peridotite compositional fields. Kimberlite was identified in DDH 97- 31, 97-33, 97-34, 97-35 and 97-36. The dike is narrow and in sharp contact with the surrounding mafic to intermediate metavolcanic rocks.

Mineral Record Details

References

Map - Riggs and West townships, Algoma District

Publication Number: M2353 Scale: 1:31,680    Date: 1977

Author: Srivastava P., Bennett G., Elmhirst F., Andrews M.D.

Publisher Name: Ontario Geological Survey

Location:

Publication - De Beers Confirms Diamond Indicator Minerals In Kimberlitic Drill Core

Publication Number: Clippings Date: 2000

Author: Pele Mountain Resources

Publisher Name:

Location: Timmins RGO

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Ministry Contact Information

For detailed information regarding this mineral record please contact the Sault Ste. Marie Resident Geologist District Office