Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI31C08SW00048

Record: MDI31C08SW00048

General

Mineral Record Identification
Record Name(s) Brewers Mills Occurrence - 1990
Related Record Type Simple
Record Status Occurrence
Date Created 1991-May-29
Date Last Modified 2022-Jan-05
Created By Q Unknown
Revised By A Wilson

Commodities

Primary Commodities: Wollastonite

Secondary Commodities: Graphite



Location

Township or Area: Pittsburgh

Latitude: 44° 24' 46.18"    Longitude: -76° 18' 33.05"

UTM Zone: 18    Easting: 395768   Northing: 4918560    UTM Datum: NAD83

Resident Geologist District: Southern Ontario

NTS Grid: 31C08SW

Point Location Description: Fig 18 in OFR5715

Location Method: Data Compilation

Access Description: The property may be reached via Hwy.15 and the Brewers Mills Road.



Geology

Province: Grenville

Subprovince: Central Metasedimentary Belt

Geological Age: Mesoproterozoic  

Metamorphism Grade: Granulite



Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Calcite Marble 1 Graphitic Host
Quartz Arenite 2 Quartzite Adjacent
Gneiss-Unsubdivided 3 Biotite-Quartz-Feldspar Adjacent

Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1WollastoniteEconomicOre
2CalciteEconomicOre
3DiopsideEconomicOre
4GraphiteEconomicOre
5PyrrhotiteEconomicGangue
6SpinelEconomicGangue
7PyriteEconomicGangue
8MagnetiteEconomicGangue
9HematiteEconomicGangue

Mineralization Comments

Nov 01, 2013 (A Wilson) - Disseminated flake graphite comprises between 1 and 3% of mineralization within the marble. Wollastonite occurs as hypidioblastic, tabular crystals up to 1.5 cm in length, but more commonly averages 0.5 cm or less in length. The wollastonite content varies between 10-55%, and locally reaches 70-80%. Wollastonite mineralization consists of intergrown grains in bands or as disseminated crystals within a calcitic matrix. The wollastonite zone (calc-silicate rock) which occurs along the edge of a scarp dips steeply SE in what appears to be a synformal structure.



Mineral Record Details

References

Mono - Wollastonite in southeastern Ontario

Publication Number: OFR5715 Scale:     Date: 1990

Author: MacKinnon A.

Publisher Name: Ontario Geological Survey


Map - Geology, Gananoque, Ontario

Publication Number: Map 27-1962 Scale: 1:63,360    Date: 1962

Author: Wynne-Edwards, H R

Publisher Name: Geological Survey of Canada


Map - Geology, Westport, Ontario

Publication Number: Map 1182A Scale: 1:63,360    Date: 1967

Author: Wynne-Edwards, H R

Publisher Name: Geological Survey of Canada


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