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TitleGeology and coal resource potential of Early Tertiary Strata along Tintina Trench, Yukon Territory
AuthorHughes, J D; Long, D G F
SourceGeological Survey of Canada, Paper 79-32, 1980, 21 pages, (Open Access)
PublisherGeological Survey of Canada
Mediapaper; on-line; digital
File formatpdf
NTS95D; 95E/01; 95E/02; 95E/03; 95E/04; 95E/05; 95E/06; 95E/11; 95E/12; 95E/13; 105A; 105B/01; 105B/06; 105B/07; 105B/08; 105B/09; 105B/10; 105B/11; 105B/12; 105B/13; 105B/14; 105B/15; 105B/16; 105C/15; 105C/16; 105E/07; 105E/08; 105E/09; 105E/10; 105E/11; 105E/12; 105E/13; 105E/14; 105E/15; 105E/16; 105F; 105G; 105H; 105I/02; 105I/03; 105I/04; 105I/05; 105I/06; 105I/12; 105J; 105K; 105L; 105M; 105N/01; 105N/02; 105N/03; 105N/04; 105N/05; 105N/06; 105N/07; 105N/08; 105N/10; 105N/11; 105N/12; 105N/13; 105O/03; 105O/04; 105O/05; 106D/02; 106D/03; 106D/04; 106D/05; 106D/06; 115I; 115J/07; 115J/08; 115J/09; 115J/10; 115J/11; 115J/12; 115J/13; 115J/14; 115J/15; 115J/16; 115K/15; 115K/16; 115N/01; 115N/02; 115N/07; 115N/08; 115N/09; 115N/10; 115N/15; 115N/16; 115O; 115P; 116A/01; 116A/02; 116A/03; 116A/04; 116A/05; 116A/06; 116A/07; 116A/08; 116A/09; 116A/10; 116A/11; 116A/12; 116A/13; 116A/14; 116B; 116C/01; 116C/02; 116C/07; 116C/08; 116C/09; 116C/10; 116C/15; 116C/16
Lat/Long WENS-141.0000 -126.0000 65.0000 60.0000
Subjectseconomic geology; fossil fuels; structural geology; stratigraphy; biochronology; coal; coal analyses; coal seams; correlations; depositional history; faults; mineral potential; synclines; volcanic rocks; resources; Tintina Trench; Precambrian; Mississippian; Tertiary
Illustrationsphotographs; cross-sections
Released1980 08 01; 2015 07 15
AbstractEarly Tertiary (Paleocene-Eocene) coal-bearing strata, including sandstones, conglomerates and mudstone of alluvial and lacustrine origin, occur within Tintina Trench in southern and central Yukon Territory. Tintina Trench is a major linear structural feature along which late Cretaceous right-lateral movement in the order of 450 km has been postulated. At least some post-Eocene movement is indicated, however, as these strata are moderately to strongly deformed at most localities.

The early Tertiary succession is generally very poorly exposed, as large parts of the Trench are mantled by thick glacial and alluvial deposits and the coal-bearing strata are generally poorly consolidated. Its total thickness is probably highly variable and Tertiary strata may be absent at some locations. Minimum thicknesses of 700 to 800 m are indicated near the town of Ross River and northwest of Dawson.

Coal seams ranging in rank from lignite to semi-anthracite occur along the Trench near Watson Lake, Ross River and between Dawson and the U.S. border. Thin seams also occur within undated strata of possibly equivalent age near the Trench in the Dawson and Watson Lake areas. The anomalously high rank of the bituminous to semi-anthracite coals near Ross River and of the anthracite coal south of the Trench near Dawson, probably relates to thermal upgrading by nearby intrusions.

Coal resource potential is limited by the structural complexity, lateral variability and restricted extent of coal-bearing strata within the Trench. Limited exposure prevents useful resource estimates; however, small, potentially mineable deposits are indicated near Dawson and Ross River. The structural complexity and generally low rank of the coals suggests that exploitation by current underground mining methods would be impractical. Surface mining would have to be restricted to small-scale operations and, in the Watson Lake area, economics may be adversely affected by the thick surficial deposits covering the bedrock.