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File Created: 30-Apr-99 by Garry J. Payie(GJP)
Last Edit:  30-Apr-99 by Garry J. Payie(GJP)

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Name GARIBALDI OBSIDIAN Mining Division Vancouver
BCGS Map 092G075
Status Showing NTS Map 092G14E
Latitude 49º 46' 00" N UTM 10 (NAD 83)
Longitude 123º 04' 00" W Northing 5512690
Easting 495199
Commodities Volcanic Glass, Pozzolan Deposit Types R : INDUSTRIAL ROCKS
Tectonic Belt Coast Crystalline Terrane Plutonic Rocks
Capsule Geology

Obsidian from the Mount Garibaldi area is exposed about 15 kilometres northeast of Squamish. The obsidian is part of the Ring Creek lava flow and is dated as Late Wisconsin in age. The rock is pitchy, black in colour, strong and brittle and generally uniform. Microscopic examination indicated that the composition is (CANMET Investigative Report 78-206):

90% glass
8% feldspar
1% muscovite
1% magnetite and hematite

This obsidian is reported to have good potential as a pozzolan for use in the cement industry. It is considered that potential for similar obsidian deposit exists within the recent volanic flows of the area.

EMPR OF 1991-20; 1994-1
GSC MAP 42-1963; 1386A
GSC OF 611
GSC P 90-1F, pp. 95-107
CANMET IR MRP/MSL *78-206, p. 5