Mineral Deposit Inventory for Ontario

Ministry of Energy, Northern Development and Mines

Permanent Link to this Record: MDI31F04NW00023

Deposit: MDI31F04NW00023


Mineral Deposit Identification
Deposit Name(s) Macdonald Mine - 1919
Related Deposit Type None
Deposit Status past producing mine without reserves
Date Created 1985-Nov-29
Date Last Modified 2012-Aug-21
Created By Q Unknown
Revised By P J Sangster


Primary Commodities: feldspar (nonmetals), thorium, uranium, mineral specimen

Secondary Commodities: copper, titanium, zircon (metals), niobium, rare earth elements, molybdenum


Township or Area: Monteagle

Latitude: 45° 9' 56.42"    Longitude: -77° 49' 10.7"

UTM Zone: 18    Easting: 278411   Northing: 5005223    UTM Datum: NAD83

Resident Geologist District: Southeastern Ontario

NTS Grid: 31F04NW

Point Location Description: centroid of hazards

Location Method: amis site visit

Access Description: East from Cross Country Road on MacDonald Mine Road for 0.9km then north for 200m to parking lot on old dump.

Exploration and Mining History

1919-1920: Pennsylvania Feldspar Company - mine opened. 1920-1922: Verona Mining Company Limited - mine in operation. 1922-1928: Genesee Feldspar Company - mine in operation. 1929 -1935: P. MacDonald - some production from dumps and from pits on lot 19. 1954-55: Phillips-Doubt Grubstake Syndicate - prospecting, 42.5 m drifting and cross cutting; DD-7-213 m, 40-ton bulk sampling of ellsworthite-bearing material. 1956: Cloudmont Mines Limited - radiometric and ground geophysical surveys. 2000 - mineral collecting site visited by groups arranged through the Bancroft Chamber of Commerce.2012 - MNDM rehabilitation of site; adits backfilled; removed from Chamber of Commerce guidebook.


Province: Grenville

Subprovince: Central Gneiss Belt

Mineral Deposit Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
pegmatite 1 host
paragneiss 2 contains

Lithology Comments

02/17/2012 (A Wilson) - The deposit consists of several zoned, pink pegmatite dikes, dipping to the north, cutting a group of paragneiss units that trend east northeast and dip moderately to the south. There is evidence of a fault trending northwest, 2 km east of the deposit, and possibly one closer (<1 km to the east). The main dike is lens-shaped. At its western end it has a width of 5 feet and rapidly widens to the east and with depth, until a maximum width of about 70 feet is reached towards the centre of the workings. At the eastern end in the lower cut, the dike is not well exposed but does not appear to exceed about 25 feet in width.


Deposit Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Habit Description
1 andradite economic ore
2 allanite economic ore
3 betafite economic ore
4 cyrtolite economic ore
5 ellsworthite economic ore
6 plagioclase economic ore
7 microcline economic ore
8 pyrite economic ore
9 titanite economic ore
10 uraninite economic ore
11 uranothorite economic ore
12 zircon economic ore
13 magnetite economic gangue

Mineralization Comments

02/17/2012 (A Wilson) - Cyrtolite occurs in single crystals or masses of crystals that are up to 1 inch in size and are frequently covered with hematite. A typical analysis of pink feldspar from the mine is 64.60% SiO2, 19.3% Al2O3, 0.09% Fe2O3, nil CaO, 12.35% K2O, and 2.67 Na2O. A 40-ton bulk sample collected by the Phillips-Doubt Syndicate graded 3.9% U3O8

06/29/2000 (D Laidlaw) - Large allanite crystal (approx. 30 cm long) in feldspar showing radial fractures. Uranopyrochlore in smoky quartz with radial fractures. (field visit 2000).

Mineral Deposit Details

Deposit Classification
Rank Classification            
1 pegmatite
Production Data
Year Tonnes Commodities Commodity Production Reference Comment
1919 31795 Imr21, P. 17 total production 1919 to 1938; 35,048 tons
Ore Reserves Data
Zone Year Category Tonnes Reference Comments Commodities
Macdonald Mine - Wastepile 4 1956 unclassified 36 MDC023 In 1956, William Phillips Associates estimated 40 tons grading 6.0% Nb2O5
Macdonald Mine - Wastepile 3 1956 unclassified 36 MDC023 In 1956, William Phillips Associates estimated 40 tons grading 3% U3O8 (2400 lb)
Macdonald Mine - Wastepile 2 1956 unclassified 5443 MDC023 In 1956, William Phillips Associates estimated 6000 tons grading 0.2% Nb2O5 (24000 lb)
Macdonald Mine - Wastepile 1 1956 unclassified 5443 MDC023 In 1956, William Phillips Associates estimated that 6000 tons grading 0.1% U3O8 (12000 lb) Uranium .1 Percent


Book - Feldspar, p. 47,103

Publication Number: 731    Date: 1932

Author: H.S. Spence

Publisher Name: GSC

Book - NMI #070780

Date: 1996

Book - NMI FILE, 31F/4 FEL 1

Date: 1996

Book - Mineral occurrences in the North Hastings area, p. 26-27

Publication Number: ARV52-03    Date: 1943

Author: J.E. Thomson

Publisher Name: ODM

Book - Geology of Monteagle and Carlow townships, p. 39, 43-47

Publication Number: ARV63-06    Date: 1954

Author: D.F. Hewitt

Publisher Name: ODM

Book - Radioactive mineral occurrences in the Bancroft area, p. 138-140

Publication Number: ARV65-06    Date: 1956

Author: J. Satterly

Publisher Name: ODM

Book - Pegmatite mineral resources of Ontario, p. 17-18, 20

Publication Number: IMR21    Date: 1962

Author: D.F. Hewitt

Publisher Name: ODM

Book - Columbium (niobium) deposits of Ontario, p. 48

Publication Number: MRC014    Date: 1971

Author: S.A. Ferguson

Publisher Name: ODM

Book - Radioactive Mineral Deposits of the Pembroke-Renfrew area, p. 105-107, 120-121

Publication Number: MDC023    Date: 1981

Author: S.L. Masson and J.B. Gordon

Publisher Name: OGS

Book - Industrial minerals of the Pembroke-Renfrew Area, p. 122-123

Publication Number: MDC022    Date: 1981

Author: C.C. Storey and M.A. Vos

Publisher Name: OGS

Book - Granitic pegmatites of the Bancroft area, southeastern Ontario, p 93-94

Publication Number: OFR5717    Date: 1991

Author: B.E. Goad

Publisher Name: OGS

Book - Uranium and thorium deposits of Southern Ontario, p. 237-238

Publication Number: OFR5311    Date: 1981

Author: J.B. Gordon, U.C. Rybak and J.A. Robertson

Publisher Name: OGS

Map - Monteagle and Carlow townships

Publication Number: M1954-3    Scale: 1:31 680    Date: 1954

Publisher Name: ODM

Map - Precambrian Geology - Bancroft area

Publication Number: P3385    Scale: 1:50 000    Date: 1998

Publisher Name: OGS

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