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File Created: 31-Oct-1999 by Peter S. Fischl (PSF)
Last Edit:  01-Jan-0001 by BC Geological Survey (BCGS)

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NMI
Name SKIDEGATE LAKE SOUTH Mining Division Skeena
BCGS Map 103G001
Status Showing NTS Map 103G04W
Latitude 053º 04' 45'' UTM 09 (NAD 83)
Longitude 131º 55' 05'' Northing 5885058
Easting 304550
Commodities Limestone Deposit Types R09 : Limestone
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

The lower two members of the Kunga Group, consisting of the Upper Triassic Sadler and Peril formations, represent the main limestone resource of the Queen Charlotte Islands, particularly the basal massive grey limestone comprising the Sadler Formation. Its thickness varies from less than 30 metres to more than 200 metres.

The Kunga Group, consisting of the limestone members and an overlying argillite member, rests conformably on the Karmutsen Formation, and may be overlain conformably by the Jurassic Maude Group or disconformably by the Middle Jurassic Yakoun Group.

Limestone of the Sadler Formation outcrops over an elongate northwest trending steeply-sided hill 200 metres high. The limestone is exposed discontinuously over a length of two kilometres and width of up to one kilometre. A sample assayed 54.17 per cent CaO, 1.79 per cent MgO, 1.16 per cent SiO2 and 42.4 per cent loss on ignition (Paulsen, 1982, page 3-1).

Consolidated Cinola Mines Ltd. briefly evaluated this occurrence as a source of neutralizing medium for its Specogna epithermal gold prospect (103F 034).

Bibliography
EMPR BULL 54, pp. 50, 175
EMPR OF 1992-18, pp. 43-45
EMPR PF (*Paulsen, L. (1982): Limestone Study - Preliminary Evaluation - Queen Charlotte Joint Venture; in 103F General)
GSC MAP 1385A; 3-1990
GSC P 86-20; 88-1E; 89-1H, pp. 7-11; 90-10, pp. 163-172

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