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File Created: 22-Feb-2016 by Janet M. Riddell (JMR)
Last Edit:  10-Jun-2020 by George Owsiacki (GO)

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NMI
Name TZAHNY RIDGE Mining Division Omineca
BCGS Map 094D091
Status Showing NTS Map 094D13W
Latitude 056º 59' 20'' UTM 09 (NAD 83)
Longitude 127º 59' 05'' Northing 6316600
Easting 561700
Commodities Coal Deposit Types A05 : Anthracite
Tectonic Belt Intermontane Terrane Overlap Assemblage
Capsule Geology

The Tzahny Ridge occurrence is a cluster of coal seams on an alpine ridge approximately 3 kilometres west of the peak of Tzahny Mountain in the Skeena Ranges about 170 kilometres northeast of the community of Stewart. They were identified, trenched and sampled by Dawson and Ryan in 1989 (Geological Survey of Canada Open File 2555). The seams range in thickness from 1.25 to 22.7 metres. Coal is of anthracite rank (vitrinite reflectance values range from 4.60 to 5.02 per cent). However, Dawson and Ryan report that the coal quality is "poor".

The Tzahny Ridge coal occurrence is hosted by the Upper Jurassic to Lower Cretaceous Skelhorne assemblage of the Bowser Lake Group. The Skelhorne is a deltaic assemblage, and includes thinly intermixed and varicoloured siltstone, sandstone, and conglomerate, with or without coal (Geological Survey of Canada Open File 5571).

Dawson and Ryan (Geological Survey of Canada Open File 2555) reported that the "structural complexity of the area" of Tzahny Ridge precluded determination of the total number of seams present, but it appears that there are at least five. The strata are tightly folded into closely-spaced anticline-syncline pairs with axial planes striking about 315 degrees (Geological Survey of Canada Open File 5571).

Bibliography
GSC OF *2555; *5571

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