Ontario Geological Survey
Permanent Link to this Record:
MDI31C08SW00048
| 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 |
Primary Commodities: Wollastonite
Secondary Commodities: Graphite
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.
Province: Grenville
Subprovince: Central Metasedimentary Belt
Geological Age: Mesoproterozoic
Metamorphism Grade: Granulite
| Rock Type | Rank | Composition | Texture | Relationship | Calcite Marble | 1 | Graphitic | Host |
|---|---|---|---|---|
| Quartz Arenite | 2 | Quartzite | Adjacent | |
| Gneiss-Unsubdivided | 3 | Biotite-Quartz-Feldspar | Adjacent |
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Wollastonite | Economic | Ore | ||||
| 2 | Calcite | Economic | Ore | ||||
| 3 | Diopside | Economic | Ore | ||||
| 4 | Graphite | Economic | Ore | ||||
| 5 | Pyrrhotite | Economic | Gangue | ||||
| 6 | Spinel | Economic | Gangue | ||||
| 7 | Pyrite | Economic | Gangue | ||||
| 8 | Magnetite | Economic | Gangue | ||||
| 9 | Hematite | Economic | Gangue |
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.
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