Ontario Geological Survey
Permanent Link to this Record:
MDI31F02NW00008
| 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 |
Primary Commodities: Graphite
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.
Province: Grenville
Subprovince: Central Metasedimentary Belt
Geological Age: Mesoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Gneiss-Unsubdivided | 1 | Host |
|---|
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.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Graphite | Economic | Ore | ||||
| 2 | Pyrrhotite | Economic | Ore |
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.
| Rank | Characteristic |
|---|---|
| 1 | Stratiform |
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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