Ontario Mineral Inventory

Ontario Geological Survey
Permanent Link to this Record: MDI31D16NW00034

Record: MDI31D16NW00034

General

Commodities

Primary Commodities: Nepheline Syenite

Location

Township or Area: Monmouth

Latitude: 44° 58' 42.96"    Longitude: -78° 15' 7.39"

UTM Zone: 17    Easting: 716661   Northing: 4984247    UTM Datum: NAD83

Resident Geologist District: Southern Ontario

NTS Grid: 31D16NW

Point Location Description: General

Location Method: Data Compilation

Access Description: Approximately 1.8 km east of Tory Hill in lot 23, concession 11.

Exploration History

1973-74: Imperial Oil Limited - geological mapping and prospecting. 2005: El Nino Ventures Inc. - the Halo Northwest and Lake Zone in Cardiff Township and the Amalgamated Rare Earth #2 Shaft area in MonmouthTownship contain the bulk of the historic reserves, 472,000 tons grading 0.112% U308 and 292,444 tons grading 0.095% U308, respectively.

Assessment Work on File

Geology

Province: Grenville

Subprovince: Central Metasedimentary Belt

Terrane: Elzevir

Geological Age: Mesoproterozoic  

Lithology

Lithology Comments

Feb 11, 2017 (A Wilson) - Nepheline gneisses and more massive nepheline-biotite-albite rocks form an almost continuous belt about 3-1/2 miles in length, and ranging from one-quarter to one-half mile in width, generally averaging about 30 chains throughout most of the length. The belt bifurcates to the southwest at a point about one mile east of Tory Hill, the northern branch being traced in the hills south of the village and the southern branch (with an outlier) trending to the south of Lorraine Lake. Throughout most of its length the gneissic structure in this belt, as in that of locality 10, dips southward to eastward although local reversals have been noted. The nepheline rocks are bounded on the north by the band of graphitic and phlogopite marbles noted to the north at locality 10, On the south they are separated from the elongate belt described as locality 12 by the syenite-granite complex continuous with that of locality 10. The outlier mentioned above is completely enclosed by the syenite body. The nepheline rocks at this locality are nearly all markedly gneissic, although more massive varieties have been found. The road cuts on Highway 500 at Esson (formerly Otter) Creek one and one-quarter miles east of Tory Hill offer excellent exposures. At this point a prominent north-south trending ridge has been cut through, exposing a complex of nepheline-biotite-feldspar-magnetite rock and red biotite syenite. Both rocks are very coarse grained and range from gneissic to massive. Patches of silicated marble seen in the road cut represent xenoliths of the original country rock. The nepheline content of the rock here, as elsewhere, is highly variable, but seldom exceeds 40 to 50 per cent even over a few inches.

Mineralization

Mineralization Comments

Feb 11, 2017 (A Wilson) - On the E zone, or northern section of the north zone, surface trenching has indicated the presence of a flatly dipping calcite-fluorite vein over 200 ft. long and up to 6 ft. wide.; low radioactivity was noted. In the adit driven eastward below this vein structure, no calcite-fluorite vein material was cut. Uraninite crystals occur within a yellow-brown syenite dike and a considerable amount of drifting was done on this uraninite-bearing zone. The uraninite occurs in crystals up to ½ inch in size along the contact and within the dike. A bulk sample sent to the Mines Branch at Ottawa is reported by MacKenzie to have averaged 0.135% U3O8. Uraninite also occurs in a calcite-hornblende-mica vein 2 feet wide.

Mineral Record Details

References

Part - Radioactive mineral occurrences in the Bancroft area

Publication Number: ARV65-06 Page: 49-50  Date: 1998

Author: Satterly J., Hewitt D.F.

Publisher Name: Ontario Dept. of Mines

Location:

Publication - Geology of the Haliburton and Bancroft areas, Province of Ontario; Geological Survey of Canada, Memoir no. 6

Publication Number: GSC Memoir 6 Page: 266-267  Date: 1910

Author: Adams, F D, Barlow, A E.

Publisher Name: Geological Survey of Canada

Location: https://doi.org/10.4095/100481

Publication - Excursions in the Eastern Townships of Quebec and the eastern part of Ontario; International Geological Congress, Guidebook 2

Publication Number: GSC GB 2 Page: 56  Date: 1913

Author:

Publisher Name: Geological Survey of Canada

Location:

MonoMap - Geology of Glamorgan and Monmouth townships, Haliburton County

Publication Number: OFR5021 Page: 59-60  Date: 1997

Author: Armstrong H.S., Gittins J.

Publisher Name: Ontario Dept. of Mines

Location:

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:

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