Ontario Geological Survey
Permanent Link to this Record:
MDI31F04NW00102
| Record Name(s) | Welsh Farm - 1950 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Discretionary Occurrence |
| Date Created | 1986-May-21 |
| Date Last Modified | 2023-Jun-16 |
| Created By | |
| Revised By |
Primary Commodities: Thorium, Cerium
Secondary Commodities: Uranium, Rare Earth Elements
Township or Area: Monteagle
Latitude: 45° 12' 25.02" Longitude: -77° 47' 5.65"
UTM Zone: 18 Easting: 281299.189 Northing: 5009713.549 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31F04NW
Point Location Description: Precise
Location Method: Conversion from MDI
Access Description: The location of the occurrence is approximately 2.1 km northeast of Monteagle Valley.
1950s: pitting and trenching by unknown individuals.
Jun 16, 2023 (Therese Pettigrew) - The country rocks in the area comprise a sequence of quartzo-feldspathic gneiss, meta-arkose, calc-silicate gneiss, amphibolite and marble belonging to the Grenville Supergroup. The metasediments are intruded by small bodies of syenite, granite and granite pegmatite. The grade of metamorphism is upper almandine amphibolite facies. The gneisses in this area strike N-NNE with shallow easterly dips (Masson and Gordon, 1981).
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | syenite | Host |
|---|
Jun 16, 2023 (Therese Pettigrew) - In a field 700 feet north of the barn on the farm of Mr. Welsh, Lot 8, Concession 10, Monteagle Township, there is a small 8-foot exposure of interbanded amphibolite, pyroxenite, and granite pegmatite. The rock is distinctly gneissic and contains numerous knobs of black vitreous allanite up to 4 inches in diameter. The allanite makes up about 10 percent of the exposure (Hewitt, 1955). Because of poor exposure in the pit, it was not possible to examine the mineralization and its relationship to the host rock in situ. Fly rock close to the pit suggests that the host rock is syenite pegmatite composed of coarse-grained feldspar and hornblende which contains up to 20 percent allanite in masses up to 10 cm in diameter (Masson and Gordon, 1981).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Allanite | Economic | Ore |
Jun 16, 2023 (Therese Pettigrew) - High radioactivity levels were recorded only in the immediate area of the showing. The only other exposure in the proximity of the occurrence, a small outcrop of hornblende plagioclase pegmatite, has a radioactivity level of 80cpm (U+Th) (Masson and Gordon , 1981).
Part - Geology of Monteagle and Carlow townships
Publication Number: ARV63-06 Page: 70 Date: 1998
Author: Hewitt D.F.
Publisher Name: Ontario Dept. of Mines
Location:
Map - Geological series, radioactive mineral deposits of the Pembroke-Renfrew area, southern Ontario
Publication Number: P2210 Scale: 1:126,720 Date: 1980
Author: Masson S.L., Gordon J.B., Storey C.C.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Radioactive mineral deposits of the Pembroke-Renfrew area
Publication Number: MDC023 Page: 118-20 Date: 1981
Author: Masson S.L., Gordon J.B.
Publisher Name: Ontario Geological Survey
Location:
Mono - Uranium and thorium deposits of southern Ontario
Publication Number: OFR5311 Page: 297 Date: 1981
Author: Gordon J.B., Rybak U.C., Robertson J.A.
Publisher Name: Ontario Geological Survey
Location:
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