Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI000000001284

Record: MDI000000001284

General

Commodities

Primary Commodities: Gneiss

Location

Township or Area: McCraney

Latitude: 45° 35' 40.88"    Longitude: -79° 0' 14.44"

UTM Zone: 17    Easting: 655678.001   Northing: 5050953.997    UTM Datum: NAD83

Resident Geologist District: Southern Ontario

NTS Grid: 31E11NE

Point Location Description: precise

Location Method: Based on Assessment

Access Description: From Hwy 11 to Hvy 518 past Kearney east for about 22 km to 0.5 km past past Round Lake to a l km long ridge of flaggy granitic gneiss.

Exploration History

1993-95: Z. Mandziuk - prospecting, petrography, stripping, mapping. 2003-2010: Z. Mandziuk - stripping, stone assessment

Assessment Work on File

Geology

Province: Grenville

Subprovince: Central Gneiss Belt

Terrane: Algonquin

Domain: Novar

Geological Age: Mesoproterozoic  

Lithology

Lithology Comments

Aug 15, 2011 (A Wilson) - Along the north side of the road and about 100 metres from it, a series of steep to overhanging rock scarps dips to the northeast and is well-exposed over about1km. Rock is variably flaggy, well-layered, and fissile with parallel ribbon lineation in areas of intense shearing. The stone can be split into thicknesses of about 2-10cm. Greater than 60% of the stone exposed at the site is estimated to be amenable to a variety of possible landscaping and decorative building stone applications, and this percentage should increase with selective light blasting of the face to penetrate less weathered material. The stripping site is part of a 300-metre ridge of steep to overhanging northeast dipping (35-45°) rock scarps trending along, and situated approximately 50 to 60 metres east of, the road (formerly a railway) leading to Rain Lake in Algonquin Park. The rock scarp at the stripped site is approximately 15m high and stepped with moderate overhangings. Orange-pink granitic gneiss comprises most of the rock which is strongly foliated and banded with a finely sparkling sugary lustre and grey biotitic ribbons set in a granoblastic quartzofeldspathic matrix (0.5mm), with evenly dispersed porphyroblasts of lensoid to streaky quartz+feldspar. The stone is variably flaggy to fissile, well-layered, hard, tough, and attractive; with a characteristic streaky felsic ribbon lineation typical of Grenville paragneisses occurring within ductile shear zones. Sparkling, greyish granitic gneiss with more than 20% mafic biotitic layers comprises less than 1/3 of the stripped area and is gradationally interlayered with the orange-pink granitic gneiss. The colour and fabric variations among these two types of gneisses are complementary with regard to combined flagstone applications. On average, the mineral components and their volumetric ranges consist of perthitic potassium feldspars (40- 45%), quartz (30-35%), plagioclase (10-15%), biotite (5-20%), and magnetite (1-2%). The rocks are considered to be metamorphically derived from interbedded arkoses and arkosic wackes.

Mineralization Comments

Aug 15, 2011 (A Wilson) - There is an estimated resource of 100,000 tonnes of building stone (flagstone, veneer stone, ornamental stone, crushed stone) in the area

Mineral Record Details

References

Map - Precambrian Geology, Kawagama Lake Area

Publication Number: P3525 Scale: 1:50,000    Date: 2003

Author: Lumbers S.B., Vertolli V.M.

Publisher Name: Ontario Geological Survey

Location:

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