Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI31C16SE00040

Record: MDI31C16SE00040

General

Mineral Record Identification
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

Commodities

Primary Commodities: Graphite



Location

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.



Exploration History

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.


Geology

Province: Grenville

Subprovince: Central Metasedimentary Belt

Terrane: Frontenac

Geological Age: Mesoproterozoic  

Metamorphism Type: Regional



Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
Marble 1 Siliceous Host
Gneiss-Unsubdivided 2 Adjacent

Lithology Comments

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.




Mineralization

Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Alteration Style
1GraphiteEconomicOre

Mineralization Comments

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.



Mineral Record Details

Characteristics
Rank Characteristic            
1 Concordant

Mineral Zones - Size and Shape

Zone Name: Detour Lake - Rank 1
Shape Length Thickness Depth Strike Dip Plunge Trend Age Reference
Lens 1700 75
Reserves or Resources Data
Zone Year Category Tonnes Reference Comments Commodities
Portland Property 1951 Possible 295000 Pistol Bay Mining website August 28, 2013 Graphite 6.0 Percent

References

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