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File Created: 13-May-1991 by Peter S. Fischl (PSF)
Last Edit:  31-Oct-1999 by Peter S. Fischl (PSF)

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Name FLORENCE CREEK Mining Division Skeena
BCGS Map 103F059
Status Showing NTS Map 103F09W
Latitude 053º 32' 45'' UTM 08 (NAD 83)
Longitude 132º 16' 11'' Northing 5936279
Easting 681006
Commodities Volcanic Glass, Perlite Deposit Types R12 : Volcanic glass - perlite
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

This showing of expandable volcanic glass lies in an area underlain by basaltic flows and breccias and by rhyolite flows of the Tertiary Masset Formation. The entire sequence dips gently to the northwest.

A roadcut northwest of Florence Creek, 15 kilometres southwest of Port Clements, exposes black, medium-grained, feldspar porphyritic glassy dacite for a length of 300 metres. The dacite pops violently when heated with a propane torch, instead of expanding gradually as for a nearby perlite occurrence (103F 022). A sample tested by CANMET exhibited the following characteristics (Geological Fieldwork 1990, pages 265 to 267): Per cent weight loss when heated to 800 degrees Celsius: 1.2 Softening temperature (degrees Celsius): 1210-1240 Density before heating (kg per cubic metres): 2570 Density after heating to softening temp. (kg per cubic metre): 928

EMPR BULL 54, p. 175
EMPR FIELDWORK *1989, pp. 481-487; *1990, pp. 265-268; 1997, pp. 19-1-19-14
GSC MAP 1385A; 6-1990
GSC P 86-20; 88-1E, pp. 269-274; 89-1H, pp. 73-79; 90-10, pp. 305-324