Ontario Geological Survey
Permanent Link to this Record:
MDI31F05SW00010
| Record Name(s) | Dubblestein - 1955 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1986-Feb-26 |
| Date Last Modified | 2023-May-25 |
| Created By | |
| Revised By |
Primary Commodities: Uranium, Thorium
Secondary Commodities: Niobium, Tantalum
Township or Area: Bangor
Latitude: 45° 22' 8.94" Longitude: -77° 46' .14"
UTM Zone: 18 Easting: 283347.09 Northing: 5027683.66 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31F05SW
Point Location Description: Lot: 13 N 1/2 Conc: 10
Location Method: Conversion from MDI
Access Description: Approximately 6.6 km west on Highway 62 from Combermere, a paved township road leads north and west 4.1 km to the village of Centreview. The showing is on the northwest shore of Mill Pond, approximately 0.8 km by foot west from the paved township road 1.9 km north of Centreview.
1955: Mr. Dubblestein submitted samples for uranium analysis and carried out 352 ft of drilling.
| Rock Type | Rank | Composition | Texture | Relationship | Pegmatite | 1 | granite | Contains |
|---|---|---|---|---|
| Paragneiss | 2 | biotite-hornblende | Adjacent |
May 25, 2023 (Therese Pettigrew) - Interlayered biotite-quartz -plagioclase gneisses and biotite-hornblende amphibolite gneisses, with minor rusty-weathering biotite amphibolite gneiss occupy the area north of Mill Pond. The gneisses are irregularly folded with large changes in strike and dip within meters. These rocks are intruded by granite pegmatite bodies as both sills and dikes. A prominent N57 W striking fracture system with vertical dip has been imposed on all the above rocks. The pegmatite dike, which is relatively flat-lying, shows a well-developed internal zoning with core, intermediate, border and contact zones. The core is composed entirely of milky quartz . The intermediate zone contains abundant quartz, large microcline crystals (1-2 m), and large books of biotite. The border zone consists of intergrowths of quartz and feldspar and is distinguished from the intermediate zone by decrease in the size of microcline crystals to 25 cm, lack of large quartz pods and biotite which is disseminated and in small books. The contact zone, about 10 cm wide, contains minor hornblende which may reflect assimilation of the paragneiss country rocks . Radioactivity of the pegmatite with the exception of pyrochlore associated with biotite, was not anomalous. The country rocks in the vicinity of the showing are grey to black biotite-hornblende-plagioclase gneisses, with interlayered mafic amphibolite and rusty-weathering amphibolite. Sphene (up to 2%) is present in the gneiss near the contacts with the pegmatite. Samples of the country rock from the hanging wall of the pegmatite have the following compositions: Yellow-red rusty-weathering biotite-hornblende-plagioclase gneiss (R-77-76-8A) taken from within 25 cm of the pegmatite contact, has a composition of quartz diorite, with a normative plagioclase content of An 47. This sample assayed 8 ppm U3O8 and <10 ppm Th. Rusty-weathering biotite amphibolite (R-77-76-8B) from the same area has the composition of high-iron komatiite. This sample assayed 3 ppm U3O8 and <10 ppm Th. The uranium content of both rocks is nigh considering their mafic composition and it may indicate that the uranium has migrated from the pegmatite to the mafic gneisses (Gordon and Masson, 1980).
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Pyrochlore | Economic | Ore |
May 25, 2023 (Therese Pettigrew) - The showing is well exposed for a length of 20 m but the country rock is only moderately exposed. This occurrence is a mineral collecting site. Radioactive mineralization is associated with the large biotite books in the coarsely-crystallized intermediate zone of the pegmatite. A black vitreous mineral, Sample R-77-76-2, present within biotite books or adjacent to them, was identified as pyrochlore with 1.5% U3O8 and 0.8% Th. The microcline surrounding this mineral is shattered with red colouration caused by hematitization. A sample (R-77-76-3) of a less radioactive mineral resembling ilmenite and non-magnetic was also found within a biotite book. It assayed 80 ppm U3O8 and 101 ppm Th, but was not identified. Mineral samples assaying as high as 8.63% U3O8 have been reported from this dike (Gordon and Masson, 1980).
MonoMap - Radioactive mineral deposits of the Pembroke-Renfrew area
Publication Number: OFR5294 Page: 7-9 Date: 1980
Author: Gordon J.B., Masson S.L.
Publisher Name: Ontario Geological Survey
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: 28-30 Date: 1981
Author: Masson S.L., Gordon J.B.
Publisher Name: Ontario Geological Survey
Location:
We are continuously updating our assessment file / technical report information. If you notice errors in the data, please contact us.
Please review our Terms of Use agreement for this data product.
For detailed information regarding this mineral record please contact the Southern Ontario Resident Geologist District Office