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File Created: 22-Nov-1988 by Steve B. Butrenchuk (SBB)
Last Edit:  15-Apr-1991 by George Owsiacki (GO)

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NMI
Name JOFFRE Mining Division Fort Steele
BCGS Map 082J054
Status Showing NTS Map 082J11W
Latitude 050º 34' 00'' UTM 11 (NAD 83)
Longitude 115º 15' 34'' Northing 5603085
Easting 623265
Commodities Gypsum Deposit Types F04 : Bedded celestite
Tectonic Belt Foreland Terrane Ancestral North America
Capsule Geology

Gypsum is exposed along the north bank of a westerly flowing tributary of Joffre Creek. It varies from cream to pale grey to grey and is laminated to thin bedded. Laminations and bedding are highly contorted. Approximately 20 metres above the base of the outcrop the rock is distinctly conglomeratic in appearance. This band is 5 metres thick and consists of ovular gypsum fragments in a gypsum matrix. Selenite is locally abundant but native sulphur is absent.

The gypsum at the Joffre occurrence has a minimum thickness of 40 metres with a strike length of less than 100 metres. Bedding strikes east-northeast with shallow dips to the north.

Stratigraphic relationships are uncertain. Tentatively this unit is assigned to the Upper(?) Middle and Earlier(?) Devonian "Basal Devonian Unit" (Open File 1988-14). Most probably it is equivalent to the Devonian Burnais Formation which is host to gypsum deposits in the Stanford Range.

Bibliography
EMPR FIELDWORK *1988, p. 504
GSC OF 634
GSC P 86-1B, pp. 457-465
EMPR PFD 650040, 3558, 840759, 840785

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