Mineral Deposit Inventory for Ontario

Ministry of Energy, Northern Development and Mines

Permanent Link to this Record: MDI31E01SE00152

Deposit: MDI31E01SE00152


Mineral Deposit Identification
Deposit Name(s) Dwyer Fluorite Mine - 1918, South Cardiff - 1993
Related Deposit Type None
Deposit Status prospect
Date Created 1993-Mar-04
Date Last Modified 2013-Nov-07
Created By Q Unknown
Revised By A Wilson


Primary Commodities: graphite, fluorite

Secondary Commodities: apatite (gemstones), mica, serpentinite, mineral specimen


Township or Area: Cardiff

Latitude: 45° 3' 52.02"    Longitude: -78° 10' 48.31"

UTM Zone: 17    Easting: 722003   Northing: 4993979    UTM Datum: NAD83

Resident Geologist District: Southeastern Ontario

NTS Grid: 31E01SE

Point Location Description: open cut

Location Method: amis site visit

Access Description: On Hwy 648, east of Wilberforce, with the junction to Little Cardiff Lake Road on the left. Road-cuts are on the east side of the junction.

Exploration and Mining History

1918-1920: P.J. Dwyer - adit under construction, 37 tons (33.5 tonnes) of fluorspar shipped. 1943: F.K. Montgomery, J.K. MacFarlane and R. M. Clarke – property optioned, DD-22-100 ft, in production. 1944-45: Tops Mining Syndicate Limited – in production, adit extended to 156 feet at the end of 1945


Province: Grenville

Subprovince: Central Metasedimentary Belt

Mineral Deposit Lithology

Lithology Data
Rock Type Rank Composition Texture Relationship
vein 1 calcite-fluorite-apatite host
fenite 2 syenite contains
pegmatite 3 syenitic adjacent

Lithology Comments

11/01/2013 (A Wilson) - The host rock is described as a highly syenitized rock developed mainly in alaskitic granite with abundant patches and veinlets of alkali pyroxene and amphibole and local patches of highly fenitized rock. The original lithology has been largely replaced by nepheline-normative alkali-feldspar syenite. The calcite vein is 10 feet thick and dips 30ºS. At least one segment of the vein can be traced intermittently along the flank of the ridge. A narrow vein also was observed in an old pit 2000 feet west of the open cut.


Deposit Mineralization and Alteration
Rank Mineral Name Class Economic Mineral Type Alteration Mineral Type Alteration Ranking Alteration Intensity Habit Description
1 fluorospar economic ore
2 graphite economic ore
3 chondrodite economic gangue
4 fluorite economic gangue
5 apatite economic gangue
6 magnetite economic gangue
7 mica economic gangue
8 olivine economic gangue
9 pyrite economic gangue
10 pyrrhotite economic gangue

Mineralization Comments

11/01/2013 (A Wilson) - Purple fluorite occurs as coarsely granular aggregates forming bands in cream-white calcite which fluoresces pink when exposed to " short" ultraviolet rays. The bands are straight, wavy or contorted and produce attractively patterned specimens. Green and red apatite occurs as crystals commonly 3 cm in diameter. Black hornblende and green clinopyroxene also occur in the calcite. Vein thicknesses from the 1943 diamond drilling program averaged 3 feet thick and 43% CaF2. Purple fluorite was estimated to comprise 20-30% of the vein material in 1963. Unoriented crystals of brown and green apatite, up to 4 inches thick and 12 inches long formed 5-10% of the vein material. Occasional crystals of black hornblende up to 12 inches in length also have been observed.

Mineral Deposit Details

Deposit Classification
Rank Classification            
1 vein
Deposit Characteristics
Rank Characteristic            
1 vein
Production Data
Year Tonnes Commodities Commodity Production Reference Comment
1918 34 Fluorite 34 Tonne 37 tons (33.5 tonnes) of fluorspar shipped between 1918 and 1919
1943 41 Fluorite 41 Tonne Arv53-1 P. 71 40 tons, 40.6 tonnes shipped
1944 23 Fluorite 23 Tonne Arv54-2 P.7 23 tons - 23.3 tonnes shipped


Book - Rocks and Minerals for the Collector, Bancroft-Parry Sound Area and southern Ontario, p. 83-84

Publication Number: MR39     Date: 1986

Author: A. P. Sabina

Publisher Name: GSC

Reference Location: Tweed RGO

Map - Precambrian Geology Wilberforce Area

Publication Number: P3526     Scale: 1:50 000    Date: 2003

Publisher Name: OGS

Book - Statistical Review, p.50

Publication Number: ARV28-1     Date: 1919

Author: T.W. Gibson

Publisher Name: ODM

Book - Mines of Ontario, p.115

Publication Number: ARV29-1     Date: 1920

Author: T.F. Sutherland

Publisher Name: ODM

Book - Mines of Ontario in 1943, p.71

Publication Number: ARV53-1     Date: 1944

Author: W.O. Tower

Publisher Name: ODM

Book - Mines of Ontario in 1944, p.7

Publication Number: ARV54-2     Date: 1945

Author: W.O. Tower

Publisher Name: ODM

Book - Mines of Ontario in 1944, p.5

Publication Number: ARV55-2     Date: 1946

Author: W.O. Tower

Publisher Name: ODM

Book - Fluorspar in Ontario, p.15-16

Publication Number: IMR012     Date: 1964

Author: G.R. Guillet

Publisher Name: ODM

Map - Cardiff and Faraday townships

Publication Number: M1957-1     Scale: 1:31 680    Date: 1957

Publisher Name: ODM

Book - Industrial minerals of the Algonquin Region, p.12, 91

Publication Number: OFR5425     Date: 1983

Author: W. Martin

Publisher Name: OGS

Map - Haliburton

Publication Number: M0052a     Scale: 1:126 720    Date: 1943

Publisher Name: ODM

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