Ontario Geological Survey
Permanent Link to this Record:
MDI31F04SE00035
| Record Name(s) | Dungannonite - 1990, Blue Corundum - 2000, York River Corundum - 2000, Dungannonite Property - 2000, East Bronson Landing Area - 2000, Ellet - 1990 |
|---|---|
| Related Record Type | Simple |
| Related Record(s) | |
| Record Status | Occurrence |
| Date Created | 1990-Nov-16 |
| Date Last Modified | 2022-Jul-06 |
| Created By | |
| Revised By |
Primary Commodities: Corundum (Gemstones)
Secondary Commodities: Nepheline Syenite
Township or Area: Dungannon
Latitude: 45° 5' 32.79" Longitude: -77° 44' 48.22"
UTM Zone: 18 Easting: 283864.421 Northing: 4996890.344 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31F04SE
Point Location Description: Property symbol ' D ', 3.25 km SE of Vardy.
Location Method: Conversion from MDI
Access Description: From Bancroft drive E on Hwy 500 (28) and turn left after crossing the York River. Drive 3.5 km until the road branches and take the trail on the right (only vehicles with a high clearance can drive part of the way along the trail). It is a 25 minute walk on a blazed path. The area forms a high ridge E of the end of the York River road. The area described under the title ' East Bronson Landing Area ' is located on lot 12, con 14.
Mineral location (blue star corundum) and location of ' dungannonite '. c 1900 : Several pits and trenches were opened for corundum on top of the ridge. The main workings consist of 2 open-cuts on lot 12, con 14, about 1/4 ml S of the river (3 small pits to the N of this and 1 to the S). The largest is 40 x 6 x 4-5 ft deep in corundum-rich nepheline-andesine gneiss. Garnet, zircon, hornblende, biotite, apatite, muscovite, tourmaline and scapolite occur as accessories. 1965 : stripping and trenching on the E half of lot 12. 1980 : J. Ellet reports mining about 40 lbs of material (70 % crystals) and cutting about 30 stones. The Bancroft Mineral Society / Bancroft Gem and Mineral Club has rights on the property on lot 12 (W), con 14 for mineral collecting.
Province: Grenville
Geological Age: Mesoproterozoic
Dec 07, 2005 (C Papertzian) - Dungannonite is a corundum-bearing alkali syenite with accessory nepheline (a nepheline-poor corundum-scapolite-andesine gneiss) and it outcrops on an 80 ft high ridge on these lots. The corundum occurs in 2 parallel bands, each about 5 ft wide, and separated by about 50 ft of foliated gneiss - the nepheline-corundum gneiss units occur as relics in a ridge that is predominantly syenite and granite pegmatite. Small lenses of quartz-feldspar pegmatite occurr immediately to the W of the ridge; to the E a large, homogeneous granite pegmatite is exposed for 90 m. The corundum crystals are a semi-opaque pale blue colour and some are a rich transparent blue in the centre (fading to white or grey towards the edge). All have fine fractures, although one specimen was exhibited as a true sapphire in 1901. They can reach 3 inches in size.
| Rank | Mineral Name | Class | Economic Mineral Type | Alteration Mineral Type | Alteration Ranking | Alteration Intensity | Alteration Style |
|---|---|---|---|---|---|---|---|
| 5 | Corundum | Economic | Ore | ||||
| 10 | Garnet | Economic | Ore | ||||
| 15 | Muscovite | Economic | Ore | ||||
| 20 | Scapolite | Economic | Ore | ||||
| 25 | Tourmaline | Economic | Ore | ||||
| 30 | Zircon | Economic | Ore |
Part - Mineral occurrences in the north Hastings area
Publication Number: ARV52-03 Page: 20 Date: 1998
Author: Thomson J.E.
Publisher Name: Ontario Dept. of Mines
Location:
Part - Geology of Dungannon and Mayo townships
Publication Number: ARV64-08 Page: 44, 38 Date: 1998
Author: Hewitt D.F., James W.
Publisher Name: Ontario Dept. of Mines
Location:
MonoMap - Industrial minerals of the Algonquin region
Publication Number: OFR5425 Page: 35 Date: 1983
Author: Martin W.
Publisher Name: Ontario Geological Survey
Location:
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: 79-80, 96 Date: 1913
Author:
Publisher Name: Geological Survey of Canada
Location:
Book - Notes on Canadian Gems and Ornamental Stones; In: Contributions to Canadian Mineralogy, 1944; University of Toronto Studies, Geological Series vol. 49
Publication Number: ContCanMin 49 Page: 77 Date: 1945
Author: Waite, G.G.
Publisher Name: University of Toronto Press
Location: https://www.mineralogicalassociation.ca/wordpress/wp-content/uploads/2020/10/1944-vol-49.pdf
File - Resident Geologist files 1984
Publication Number: Date: 2000
Author:
Publisher Name:
Location: Tweed RGP
Publication - Rock and mineral collecting in Canada, volume II: Ontario and Quebec; Geological Survey of Canada, Miscellaneous Report 8
Publication Number: GSC MR 8 Page: 79 Date: 1964
Author: Sabina, A P
Publisher Name: Geological Survey of Canada
Location: https://doi.org/10.4095/119882
Map - Geological series, industrial minerals of the Pembroke-Renfrew area, southern Ontario
Publication Number: P2209 Scale: 1:126,720 Date: 1980
Author: Vos M.A., Storey C.C.
Publisher Name: Ontario Geological Survey
Location:
MonoMap - Industrial minerals of the Pembroke-Renfrew area, part 2
Publication Number: MDC022 Page: 87, 89 Date: 1981
Author: Storey C.C., Vos M.A.
Publisher Name: Ontario Geological Survey
Location:
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