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Occurrence Details


Occurrence Number
105D 042
Occurrence Name
Whitehorse Coal
Occurrence Type
Hard-rock
Status
Past Producer


General Information

Primary Commodities: coal
Aliases: Black Diamond
Deposit Type(s): Coal
Location(s): 60.497220 N, -135.285560 W
NTS Mapsheet(s): 105D06
Location Comments: .5 Kilometres
Hand Samples Available at YGS: No

Capsule

Work History

Discovered in 1899 by a Mr Johnson and staked as coal lease 1239 in Sep/1900 by Robert Lowe. Lease 1473 was staked the following month by J.E. Beatty, assistant engineer for the White Pass & Yukon Railway. The leases were acquired by Whitehorse Coal CL, which drove a 18 m adit and another short tunnel on two seams exposed in a creek gulch (now called the Fisher Creek showing) and an open cut on a second showing (now the Main Showing of Whitehorse Coal Corp) about 0.8 km east, all in 1901. The coal from the adit was hauled to Whitehorse and tested by the railway.
The property was idle until 1969 when it was examined by Luscar L as part of Coal Exploration Licence 3, although the U.S. Army reportedly investigated it about 1943. It was later acquired as Coal Mining Leases 2989-2991 in Jun/81 by Whitehorse Coal Corp (Echo Developers L), which performed road construction, trenching and open cut mining in 1982 and 1983, rotary drilling in 1985 (225 m in 6 holes), and mined 1885 tonnes in 1986 and 2721 tonnes in 1988, part of which was tested in Whitehorse.

Capsule Geology

Coal seams occur interlayered with siltstone and mudstone in Early Cretaceous Tantalus Formation non-marine braided alluvial material deposited in a graben. This sequence has been intruded by rhyolite sills up to 15 cm wide which have converted much of the coal to anthracite.
A lower seam at least 3.3 m wide on surface has been traced for 1 km and an upper seam at least 1.8 m wide on surface, about 50 m higher in the section, has been traced for 2 km. At Fisher Creek, a north-trending fault has displaced the upper seam 100 m. Both seams strike west to west-northwest, dip 30 to 50°N and are deformed by large open north-plunging folds. In Sep/69 Luscar Ltd roughly estimated underground reserves of 2 381 384 tonnes containing an ash content of approximately 46% and an energy value of 13 355 kJ/kg.
Analyses of samples taken in 1982 indicated the coal is ranked as a meta-anthracite with 3.5% moisture, 38.2% ash and a calorific content of 19.8 Mj/kg. The 1985 drill hole cut from 2 to 7 coal bands in the lower seam over an overall width ranging from 18.9 to 33.5 m. The widest individual coal band was 13.1 m. In 1985 Carlyle estimated open pit reserves at approximately 182 198 tonnes containing an ash content of approximately 22.48% and an energy value of 25 198 kJ/kg.
Test mining at the Main Zone in 1986 was complicated by the folding and a bulk sample had a higher ash content (45.4%) than expected. Testing indicated that the ash content could not be significantly reduced by crushing, screening and washing.

References

AURUM GEOLOGICAL CONSULTANTS INC., 1994. Yukon Coal Inventory 1994. Energy and Mines Branch, Economic Development, Yukon Territorial Government, 169 p.

BREMNER, T.J., 1988. Geology of the Whitehorse Coal Deposit. In: Yukon Geology Vol. 2, Exploration and Geological Services Division, DIAND, p. 1-7.

BREWER, W.M., 1 Feb/02. Whitehorse Mining District, Y.T. EMJ p. 167-8.

GEOLOGICAL SURVEY OF CANADA Annual Rept 1900, Part A, p. 48.

GEOLOGICAL SURVEY OF CANADA Summary Report 1906, Part A, p. 28.

LUSCAR LTD, Sep/69. Assessment Report #060580 by R. Spence Taylor.

MINERAL INDUSTRY REPORT 1969-1970, p. 158.

WHITEHORSE COAL CORPORATION, Mar/87. Assessment Reports #062171 by J.H. Perry.

WHITEHORSE COAL CORPORATION, Mar/87. Assessment Reports #092024 by J.H. Perry.

WHITEHORSE COAL CORPORATION, 1986. Construction summary for excavation of Pit No 1. Assessment Report #092045 by D. Clark.

WHITEHORSE COAL CORPORATION, 1986. Prospecting and Examination Report #061734 by A.T. Savage.

WHITEHORSE COAL CORPORATION, Nov/85. Assessment Report #092012 by L. Carlyle.

WHITEHORSE COAL CORPORATION, 1983. Assessment Report #062148 by R.P. Hill.

YUKON EXPLORATION 1984, p. 72.

YUKON NEWS, 29 Aug/83.

YUKON MINING AND EXPLORATION OVERVIEW 1988, p. 4.

Location Map

Last Updated: Oct 9, 2019

Work History

Year Work Type Comment
1988 Other
1986 Other
1985 Drilling: Rotary Number of holes drilled: 6 Amount of work done: 225 METRES
1982 Development, Surface: All Weather Road
1982 Other
1982 Trenching
1969 Geology: Bedrock Mapping
1969 Other
1901 Other Amount of work done: 18.3 METRES Drove adit.
1899 Other

Regional Geology - Terrane

Group: Intermontane
Affinity: W Laurentia
Name: Stikinia
Realm: peri-Laurentian


Regional Geology - Bedrock

Supergroup:
Group/Suite:
Formation: Tantalus
Member:
Terrane:
Period Max: Jurassic
Age Max: 171 MA
Period Min: Cretaceous
Age Min: 125 MA
Rock Major: shale/argillite/siltstone/sandstone/conglo/coal/dacite/andesite/flow
Rock Minor:
Reference: Hart & Radloff (1990) - YGS OF 1990-4
Geological Unit (1M): JKT
Geological Unit (250K): JKT

Assessment Reports that overlap occurrence

Report Number Year Title Worktypes Holes Drilled Meters Drilled
062171 1983 Report on the Whitehorse Coal Property Rock Geochemistry, Detailed Bedrock Mapping Geology, Metallurgical Tests Lab Work/Physical Studies, Petrographic Lab Work/Physical Studies, Property Evaluation Other, Mechanical Trenching
062148 1982 Whitehorse Coal Corporation Coal Leases 2989,2990,2991 Rock Geochemistry, Metallurgical Tests Lab Work/Physical Studies, Hand Trenching
061735 1975 Watson Coal Prospects, Report 1 Property Evaluation Other, Data Compilation Pre-existing Data
060580 1969 The Whitehorse Coal Area, Yukon Territory Rock Geochemistry, Bedrock Mapping Geology, Property Evaluation Other, Prospecting Other, Research/Summarize Pre-existing Data

Related References

Number Title Page(s) Document Type
ARMC020307 Prospectus report on Whitehorse Coal property - Whitehorse Mining District, Yukon - May, 1989 Report
ARMC020318 Report on Braeburn coal area, Carmacks North coal area, Carmacks South coal area, Kotaneelee coal area, Lone Pine Mountain coal occurrence, Porter's coal, Guder's coal, Whitehorse coal area, and Bush Mountain coal area - File 164 Report
Citations
Last Updated: Oct 9, 2019

Resource/Reserve

Year Zone Type Commodity Grade Tonnage Amount Reported Amount 43-101 Compliant Cut-off
1985 WHITEHORSE COAL - OPEN PIT RESERVES (OPEN PIT) Historical Estimate coal 25198 kJ/kg 182,198 No No Unknown
1969 WHITEHORSE COAL - UNDERGROUND RESERVES (UNDERGROUND) Historical Estimate coal 13355 kJ/kg 2,381,384 No No Unknown

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