Ontario Geological Survey
Permanent Link to this Record:
MDI31C16SE00040
| Record Name(s) | Portland Graphite - 2013, Cornell Property - 1964, Portland Graphite Mines Property - 1934 |
|---|---|
| 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 |
|---|---|---|---|---|
| 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 |
|---|---|---|---|---|---|---|---|
| 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 |
|---|---|
| 1 | Concordant |
| Shape | Length | Thickness | Depth | Strike | Dip | Plunge | Trend | Age | Reference |
|---|---|---|---|---|---|---|---|---|---|
| Lens | 1700 | 75 |
| Zone | Year | Category | Tonnes | Reference | Comments | Commodities |
|---|---|---|---|---|---|---|
| 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:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Southern Ontario Resident Geologist District Office