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Ontario Geological Survey
Permanent Link to this Record:
MDI31C16SE00040
Record Name(s) | Portland Graphite - 2013, Cornell Property - 1964, Portland Graphite Mines Property - 1934 |
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Related Record Type | Simple |
Related Record(s) | |
Record Status | Developed Prospect With Reported Reserves or Resources |
Date Created | 1990-Oct-18 |
Date Last Modified | 2022-Feb-18 |
Created By | |
Revised By |
Primary Commodities: Graphite
Township or Area: Bastard, Bastard, Burgess, Burgess
Latitude: 44° 44' 44.32" Longitude: -76° 9' 27.21"
UTM Zone: 18 Easting: 408364 Northing: 4955347 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31C16SE
Point Location Description: bulk sample site on online map Pistol Bay Mining Co. August 28, 2013
Location Method: Data Compilation
Access Description: The site can be reached by driving 5.5 km north on highway 15 from the community of Portland, then northwest 0.8 km on the Portland Graphite Road.
1934: J.C. Cornell – discovery. 1957: J.C. Cornell – property acquisition. 1959: Joseph Dixon Crucible Company – trenching, bulk sampling (318 kg). 1965; A. Holland – mill constructed, open pit development. 1986-91: Victoria Graphite Inc. – mapping, ground geophysics, trenching, DD-73-5488 m, 34 tonne bulk sample, metallurgical testing. 2013: Pistol Bay Mining Inc. – property acquisition.
Province: Grenville
Subprovince: Central Metasedimentary Belt
Terrane: Frontenac
Geological Age: Mesoproterozoic
Metamorphism Type: Regional
Rock Type | Rank | Composition | Texture | Relationship | Marble | 1 | Siliceous | Host |
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Gneiss-Unsubdivided | 2 | Adjacent |
Sep 10, 2013 (A Wilson) - The graphite deposits occur in 3 zones within siliceous marble. The three zones strike northeasterly and dip steeply to the west with strike lengths of 750m, 650 m and 300 m.
Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
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1 | Graphite | Economic | Ore |
Aug 03, 2016 (A Wilson) - Bulk sampling in 1959 produced a concentrate assaying 90.1% carbon for a 72.3% recovery. An increase in recovery to 78.5% resulted in a drop of grade to 60% C. Three graphite zones have been identified, D, G, and I-Zones. Ore-grade material is confined to narrow lenses within the broad graphitic zones. The zones are characterized by broad envelopes of lower-grade graphite mineralization with widths up to 75m, within which are zones of higher grade material, to >10% graphitic carbon. The 24 tonne bulk sample collected by Victoria Graphite indicated recoveries of 87 to 95% C. The graphite occurs as disseminated flakes averaging 3 mm in diameter. Some of the flake has a high aspect ratio.
Rank | Characteristic |
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1 | Concordant |
Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
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Lens | 1700 | 75 |
Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
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Portland Property | 1951 | Possible | 295000 | Pistol Bay Mining website August 28, 2013 | Graphite 6.0 Percent |
Mono - Graphite in Ontario
Publication Number: IMR020 Page: 38-39 Date: 1997
Author: Hewitt D.F.
Publisher Name: Ontario Dept. of Mines
Location:
Mono - Graphite occurrences of the Frontenac Axis, eastern Ontario
Publication Number: MDC033 Date: 1992
Author: MacKinnon A., LeBaron P.S.
Publisher Name: Ontario Geological Survey
Location:
Map - Gananoque area, Ontario
Publication Number: M2054 Scale: 1:126,720 Date: 1998
Author: Hewitt D.F.
Publisher Name: Ontario Dept. of Mines
Location:
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For detailed information regarding this mineral record please contact the Southern Ontario Resident Geologist District Office