Ontario Geological Survey
Permanent Link to this Record:
MDI000000000815
| Record Name(s) | Joyces Lake REE - 2010 |
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| Related Record Type | |
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| Record Status | Occurrence |
| Date Created | 2010-Jun-21 |
| Date Last Modified | 2023-Aug-03 |
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| Revised By |
Primary Commodities: Thorium, Uranium
Secondary Commodities: Rare Earth Elements, Lanthanum, Cerium, Rubidium, Niobium, Neodymium, Yttrium, Zircon
Township or Area: Lyndoch
Latitude: 45° 16' 22.97" Longitude: -77° 16' 46.39"
UTM Zone: 18 Easting: 321192.003 Northing: 5015810.995 UTM Datum: NAD83
Resident Geologist District: Southern Ontario
NTS Grid: 31F06SW
Point Location Description: outcrop hill 300m east of Joyces Lake
Location Method: Field Visit with GPS
Access Description: Access is obtained via the Highland Creek Road which leads westward from Highway 41 at Griffith. From Green Lake, about 10 km west of Highway 41, logging roads lead north and west to the eastern end of Joyces Lake. The outcrop areas examined are near the top of a prominent hill about 300m east of Joyces Lake.
Province: Grenville
Subprovince: Central Metasedimentary Belt
Terrane: Bancroft
Geological Age: Mesoproterozoic
| Rock Type | Rank | Composition | Texture | Relationship | Granite | 1 | Granite | Contains |
|---|---|---|---|---|
| Pegmatite | 2 | Granite | Host |
Jul 15, 2011 (P LeBaron) - The hill consists predominantly of medium-grained, pink to red, leucocratic granite which has been intruded by numerous granitic pegmatite dikes. Within an area about 300m in diameter, 12 outcrop areas containing pegmatites were examined and 10 rock samples were taken. The pegmatites consist of about 70% coarse (up to 4cm) pale pink to dark red microcline feldspar crystals, up to 25% white to smoky grey quartz, and accessory biotite, magnetite, titanite and zircon. Local variations include dark red staining of feldspars, perthitic feldspar and graphic granite texture. The pegmatites occur as zones of irregular, discontinuous, narrow (less than 1m) dikes and as larger, more continuous dikes up to 3m wide. An RS-125 (Radiation Solutions Inc.) spectrometer was operated continuously during the property examination and was useful in identifying pegmatitic zones. The instrument gave readings of 200 to 400 counts per second in areas of medium-grained granite and 1 500 to 3 000 cps over pegmatites. With the spectrometer in assay mode, readings were taken on one outcrop of granite and 8 outcrops of pegmatite. The granite gave assays of 3.8% K, 15.8ppm U, and 18.3ppm Th. Assays of pegmatitic rocks ranged from 5.3 to 9.5% K, 30 to 327ppm U and 196-667ppm Th. One of the most highly anomalous pegmatites occurs as a sill-like body at the base of a 10m high ridge of granite on the north side of the hill. The pegmatite contains very fractured, red-stained feldspar crystals, dark smoky quartz, and very coarse grains of magnetite. It is in contact with leucocratic granite above and fine-grained, biotite-rich quartz-feldspar schist below. Xenoliths of the biotite-rich rock occur in the pegmatite near the lower contact. The highest counts per second recorded by the spectrometer were obtained from fractures and hollows near the base of the pegmatite.
Jul 15, 2011 (P LeBaron) - Grab samples collected in 2010 from the site by P. LeBaron returned; BA 67.9-1348 ppm; 0.75 - 5.33 ppm Be, 4.32 - 345.12 ppm Ce, 0.62-2.46 ppm Co, 18-36 ppm Cr, 0.158-3.273 ppm Cs, 15.46- 23.48 ppm Ga, 1.2-264.36 ppm La, 0.158-38.337 ppm Nb, 0.58-141.121 ppm Nd, 0.189-44.828 ppm Pr, 11.26-430.72 ppm Rb, 274-424.4 ppm Sr, 5.25 - >109 ppm Th, 1.33-62.925 ppm U, 0.93-143.25 ppm Y and 8-244 ppm Zr.
Map - Barry's Bay, Precambrian geology
Publication Number: M2461 Scale: 1:100,000 Date: 1983
Author: Lumbers S.B.
Publisher Name: Ontario Geological Survey
Location:
Mono - Report of Activities 2010, Resident Geologist Program, Southern Ontario Regional Resident Geologist Report: Southeastern and Southwestern Ontario Districts, and Petroleum Resources Centre
Publication Number: OFR6267 Date: 2011
Author: Sangster P.J., LeBaron P.S., Laidlaw D.A., Wilson A.C., Carter T.R., Fortner L.
Publisher Name:
Location:
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