Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI31E01SE00198

Record: MDI31E01SE00198

General

Commodities

Primary Commodities: Molybdenum

Secondary Commodities: Uranium, Thorium, Rare Earth Elements

Location

Township or Area: Monmouth, Monmouth

Latitude: 45° 2' 24.97"    Longitude: -78° 14' 24.22"

UTM Zone: 17    Easting: 717373   Northing: 4991130    UTM Datum: NAD83

Resident Geologist District: Southern Ontario

NTS Grid: 31E01SE

Point Location Description: Precise

Location Method: Data Compilation

Access Description: The occurrence is located in the northeastern part of the township.

Exploration History

1942: B.E. MacDougall - stripping and shallow test pits for molybdenum. 1954: Homer Yellowknife Mines, Limited - surface prospecting, scintillometer survey, trenching, DD-17-2810 ft. 1955: Desmont Mining Corporation -, stripping and trenching. 1965: Molybdenum Corporation of Canada - geochemical survey and DD-13-3200 ft. 1976-77: Highland Mercury Mines, Limited - pitting, trenching, sampling, geological survey. 1979: Lacana Mining Ltd. - geophysical survey (radiometric). 1998-1999: Christopher Fouts, Bancroft and District Chamber of Commerce - Trenching, radiometric survey, geological mapping for mineral specimens

Assessment Work on File

Geology

Province: Grenville

Subprovince: Central Metasedimentary Belt

Terrane: Bancroft

Geological Age: Mesoproterozoic  

Lithology

Lithology Comments

Feb 11, 2017 (A Wilson) - The property is underlain by marble containing interbands of diopside rock, lime-silicate rock, and rusty mica gneisses. These rocks strike north-northwest and dip 45-60º E. They are cut by irregular bodies of granite pegmatite. The main zone extends 900 m.

Mineralization

Mineralization Comments

Feb 11, 2017 (A Wilson) - Uranothorite occurs in diopside or diopside-calcite rock within marble. Uraninite is sparsely disseminated in lime-silicate bands in marble or in micaceous marble. Allanite, molybdenite, pyrrhotite and pyrite are present. Traill reports terminated dravite crystals in disintegrated green diopside rock at the east showing of Desmont Mining Corporation. Radioactive mineral occurrences of two types have been found on the property. The first type is in the bands of pale-green diopside rock or diopside-calcite rock in the marble. These bands contain erratic and sparse disseminations of uranothorite. This type is represented by the main and east showings. The second type consists of sparse disseminations of uraninite in lime-silicate bands in marble or in micaceous marble as at the west showings. The main showing is on a high ridge on lot 31, concession XVII. Along this ridge bulldozed areas and trenches expose a sugary pale-green diopside rock or diopside-calcite rock as an interbed in marble at intervals for 2,700 feet. This assemblage is cut in places by dikes of granite pegmatite. Geiger readings on the diopside band were 5x-7x, with spot-highs of 25x-40x. The workings indicate a series of disconnected bands of diopside rock containing irregular lenses and stringers of salmon-pink calcite. Accessory minerals are uranothorite, molybdenite, pyrite, and pyrrhotite. The west showing is on the east slope of a ridge in lot 30, concession XVII, and has been explored by trenches and bulldozed strippings. These trenches expose deeply weathered micaceous marble, rusty paragneiss, and a vertical lime-silicate band about four feet wide trending N. 20º W. over a length of 200 feet. Geiger readings on the micaceous marble were slightly above back ground. On the silicate horizon spot-high readings of 3x to 4x were recorded and a little uraninite in irregular grains, ¼ to ½ inch across, was found in one trench. Assays average approximately 0.004% U3O8 (chemical). MoS2 values range from 0.016% to 0.44% in the main zone.

Dec 07, 2005 (D Laidlaw) - Also stillwellite, hydroxylbastnaesite.

Jun 12, 2023 (Therese Pettigrew) - The main zone extends 900 meters, the east zone 400 meters. Assays average approximately 0.004% U3O8 (chemical). MoS2 values range from 0.016% to 0.44% (Gordon et al., 1981).

Mineral Record Details

Mineral Zones - Size and Shape

References

File - Resident Geologist file #152 Monmouth (OP99-117)

Publication Number: Date:

Author:

Publisher Name:

Location: Tweed RGP office

Map - Monmouth Township, Haliburton County

Publication Number: M2174 Scale: 1:31,680    Date: 1970

Author: Armstrong H.S., Gittins J.

Publisher Name: Ontario Dept. of Mines

Location:

Part - Radioactive mineral occurrences in the Bancroft area

Publication Number: ARV65-06 Page: 86-88  Date: 1998

Author: Satterly J., Hewitt D.F.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Uranium and thorium deposits of southern Ontario

Publication Number: MDC004 Page: 28  Date: 1967

Author: Hewitt D.F.

Publisher Name: Ontario Dept. of Mines

Location:

MonoMap - Geology of Glamorgan and Monmouth townships, Haliburton County

Publication Number: OFR5021 Page: 154-157  Date: 1997

Author: Armstrong H.S., Gittins J.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Uranium and thorium deposits of southern Ontario

Publication Number: OFR5311 Page: 138-139  Date: 1981

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

Publisher Name: Ontario Geological Survey

Location:

MonoMap - Industrial minerals of the Algonquin region

Publication Number: OFR5425 Page: 287  Date: 1983

Author: Martin W.

Publisher Name: Ontario Geological Survey

Location:

Mono - Molybdenum deposits of Ontario

Publication Number: MDC007 Page: 35  Date: 1968

Author: Johnston F.J.

Publisher Name: Ontario Dept. of Mines

Location:

Mono - Metallogeny of the Grenville Province, southeastern Ontario

Publication Number: OFR5515 Page: 136  Date: 1984

Author: Carter T.R.

Publisher Name: Ontario Geological Survey

Location:

Part - Mineral occurrences in the Haliburton area

Publication Number: ARV52-02 Page: 69  Date: 1998

Author: Satterly J.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - Molybdenum deposits of Canada; Geological Survey of Canada, Economic Geology Report 20

Publication Number: Econ Geol 20 Page: 142  Date: 1963

Author: Vokes, F M

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/103994

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