Ontario Geological Survey
Permanent Link to this Record:
MDI31F06NE00093
| Record Name(s) | Opeongo Uranium Occurrence - 1955 |
|---|---|
| Related Record Type | Simple |
| Record Status | Occurrence |
| Date Created | 1986-Feb-28 |
| Date Last Modified | 2022-Jan-05 |
| Created By | Q Unknown |
| Revised By | A Wilson |
Primary Commodities: Thorium, Uranium, Silver, Zircon, Titanium
Township or Area: Sebastopol
Latitude: 45° 25' 5.02" Longitude: -77° 12' 14.19"
UTM Zone: 18 Easting: 327563.997 Northing: 5031756 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31F06NE
Point Location Description: approximate
Location Method: Data Compilation
Access Description: The occurrence can be reached via the gravelled Opeongo Road. It is about 10 m north of the Opeongo Road, approximately 8.4 km southeast of its intersection with Highway 512 and 100 m east of an intersection with a dirt road leading south.
1955-56: Opeongo Mines Limited - 20 DD, blasting, trenching, bulk. In 1955 approximately 100 tons of material had been stockpiled on the site.
Province: Grenville
Subprovince: Central Metasedimentary Belt
Geological Age: Mesoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | Granite | Intrudes |
|---|---|---|---|---|
| Vein | 2 | Pyroxene-Rich | Host | |
| Quartz Monzonite | 3 | Contains |
Jun 15, 2011 (A Wilson) - Uranium occurs in two pyroxene-rich veins within gneissic quartz monzonite. The monzonite is cross cut by minor granite and pyroxene rich pegmatite dikes.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 1 | Allanite | Economic | Ore | ||||
| 2 | Sphene | Economic | Ore | ||||
| 3 | Thorite | Economic | Ore | ||||
| 4 | Uranothorite | Economic | Ore |
Jun 15, 2011 (A Wilson) - Allanite and thorite often occur as small inclusions in sphene. Accessory minerals include uranothorite, biotite, pyrite, apatite, zircon,garnet and magnetite. A selected sample collected from the site by Themistocleous returned 0.015% U3O8, and 0.17% Th. A 450-pound bulk sample collected by Opeongo Mines assayed 0.048% U3O8, (chemical), 0.38%Th02 (chemical), 10.9% Ti, 1.30% Zr02 and 0.035 oz. Ag per ton. A grab sample collected from the site in 1965 by Satterly returned 10.73% U3O8, and 49.92% ThO2.
| Rank | Classification |
|---|---|
| 1 | Vein |
Map - Geological series, Clontarf area, Renfrew County, southern Ontario
Publication Number: P1560 Scale: 1:15,840 Date: 1978
Author: Themistocleous S.G.
Publisher Name: Ontario Geological Survey
MonoMap - Radioactive mineral deposits of the Pembroke-Renfrew area
Publication Number: MDC023 Scale: Date: 1981
Author: Masson S.L., Gordon J.B.
Publisher Name: Ontario Geological Survey
Mono - Uranium and thorium deposits of southern Ontario
Publication Number: OFR5311 Scale: Date: 1981
Author: Gordon J.B., Rybak U.C., Robertson J.A.
Publisher Name: Ontario Geological Survey
MonoMap - Geology of the Clontarf area, Renfrew County
Publication Number: R209 Scale: Date: 1981
Author: Themistocleous S.G.
Publisher Name: Ontario Geological Survey
Mapset - Uranium mineral potential charts for parts of southern Ontario
Publication Number: OFR5260 Scale: 1:126,720 Date: 1979
Author: Robertson J.A., Bright E.G., Gordon J.B., Springer J.S., MacDonald C.A.
Publisher Name: Ontario Geological Survey
Map - Clontarf, Renfrew County
Publication Number: M2433 Scale: 1:31,680 Date: 1980
Author: Themistocleous S.G.
Publisher Name: Ontario Geological Survey
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