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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  30-Sep-2021 by George Owsiacki (GO)

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NMI
Name O'DONNEL, O'DONNEL RIVER LIMESTONE Mining Division Atlin
BCGS Map 104N033
Status Showing NTS Map 104N05E
Latitude 059º 19' 29'' UTM 08 (NAD 83)
Longitude 133º 31' 07'' Northing 6577148
Easting 584302
Commodities Limestone, Magnesite Deposit Types R09 : Limestone
Tectonic Belt Intermontane Terrane Cache Creek
Capsule Geology

The O'Donnel occurrence is located east of Atlin Lake about 29 kilometres south of the community of Atlin.

Carbonate sediments of the upper Mississippian to Permian Horsefeed Formation (Cache Creek Complex) forms a gentle ridge between the O'Donnel and Pike rivers. The formation consists mainly of pale grey, clean limestone approximately 900 metres thick. The limestone is commonly massive and in part recrystallized so that primary textures are obliterated (Monger, Geological Survey of Canada Paper 74-47).

Although limestone comprises most of the stratigraphy, exposures at the O'Donnel River site have been described as high-grade magnesite. The occurrence of local hot springs in the carbonates suggests a source of fluids for the alteration of limestones to magnesium carbonate.

Bibliography
EMPR AR 1915-K65
EMPR OF 1987-13, p. 22; 1990-6; 1996-11
GSC P 73-18, p. 237; 74-47, p. 25
GSC MAP 1082A; 1418A
GSC MEM 307, pp. 22-23
GSC OF 864

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