Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI31F02NW00008

Record: MDI31F02NW00008

General

Mineral Record Identification
Record Name(s) Matawatchan Road Graphite - 1981
Related Record Type Simple
Record Status Occurrence
Date Created 1987-Jan-23
Date Last Modified 2022-Jan-05
Created By Q Unknown
Revised By A Wilson

Commodities

Primary Commodities: Graphite



Location

Township or Area: Brougham

Latitude: 45° 14' 12.27"    Longitude: -76° 56' 40.12"

UTM Zone: 18    Easting: 347378.003   Northing: 5011089.003    UTM Datum: NAD83

Resident Geologist District: Southern Ontario

NTS Grid: 31F02NW

Point Location Description: approximate

Location Method: Data Compilation

Access Description: The occurrence is exposed in a series of road cuts along the Matawatchan Road. The units are subparallel to the road.



Geology

Province: Grenville

Subprovince: Central Metasedimentary Belt

Geological Age: Mesoproterozoic  



Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Gneiss-Unsubdivided 1 Host

Lithology Comments

May 02, 2011 (A Wilson) - The graphite-bearing units are interlayered with rusty but non-graphitic biotite-quartz-feldspar gneiss. This gneiss has a weak foliation shown by elongation of biotite flakes and varying proportions of biotite. Segregation into leucocratic and melanocratic layers begins 1.6 km further west along strike from the location point. The metamorphic grade appears to be increasing to the west but distinct gneissic layering may be due more to the initial composition of the rocks rather than to an actual increase in metamorphic grade. The paragneiss in the vicinity of the major graphite body appears to have been an impure arkose.




Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1GraphiteEconomicOre
2PyrrhotiteEconomicOre

Mineralization Comments

May 02, 2011 (A Wilson) - The graphitic unit contains graphite in 0.5-mm to 3-mm flakes, biotite and pyrrhotite. Graphite content approaches 10 per cent of the unit. Three graphite samples were analysed for carbon, and one was analysed for trace elements. Carbon content for 3 samples ranged from 2.27% to 4.51%. The graphitic unit contains about 10 percent graphite (visual estimate), biotite, and pyrrhotite. The large amount of pyrrhotite causes this unit to weather rapidly and deeply. Fresh material could not be reached in the outcrop. The amount of sulphides present could not be determined. The graphite is directly associated with pyrrhotite. Units which contain little or no pyrrhotite contain little graphite. The graphite occurs primarily as 0.5 to 3 mm flakes.



Mineral Record Details

Characteristics
Rank Characteristic            
1 Stratiform

References

MonoMap - Industrial minerals of the Pembroke-Renfrew area, part 2

Publication Number: MDC022 Scale:     Date: 1981

Author: Storey C.C., Vos M.A.

Publisher Name: Ontario Geological Survey


MonoMap - Industrial minerals of the Algonquin region

Publication Number: OFR5425 Scale:     Date: 1983

Author: Martin W.

Publisher Name: Ontario Geological Survey


Map - Geological series, industrial minerals of the Pembroke-Renfrew area, southern Ontario

Publication Number: P2209 Scale: 1:126,720    Date: 1980

Author: Vos M.A., Storey C.C.

Publisher Name: Ontario Geological Survey


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