The Jackson No. 1 mine is situated in the southwestern corner of district Lot 88, 2.0 kilometres southwest of the Tulameen River and 6.5 kilometres west-southwest of Princeton.

This coal deposit occurs along the western margin of the Princeton Basin, a northerly trending half-graben superimposed on volcanics and sediments of the Upper Triassic Nicola Group. The basin is separated into a northern and southern area by the gentle, northwest-striking Rainbow Lake anticline. The southern area, in which this deposit occurs, is a structural depression with beds dipping 10 to 20 degrees south near Princeton, and gently east between Asp (China) Creek and the Tulameen River. South of Princeton are two major east-striking asymmetric anticlines with gentle to moderate southerly dips continuing to the south. On the western margin of the basin, the strata dips approximately 50 degrees east. In the southern part of the basin, two north to northwest plunging anticlines are present. The basin is bounded and cut in places by a number of approximately north to northeast-striking, westerly dipping faults. The main faults are the Asp Creek fault and the Boundary fault.

The deposit is hosted in a sequence of sandstone, shale, waterlain rhyolite tephra (tuff) and coal, up to 2000 metres thick, comprising the Eocene Allenby Formation (Princeton Group). The mine is developed in the Pleasant Valley-Jackson coal zone, one of four significant coal-bearing zones in a 530-metre section in the Allenby Formation. This zone was also mined at the Pleasant Valley No. 1 mine (092HSE211), and the Taylor Burson Coal mine (092HSE213). It is best represented in the Bromley Vale area where it consists of two to three seams of variable thickness (approximately 1.8 metres of coal in total) in a 30-metre stratigraphic interval.

The deposit at the Jackson No. 1 mine strikes 022 degrees and dips 50 to 55 degrees southeast. Underground workings have followed the seam downdip for up to 70 metres and along strike for 390 metres. The mined seam is 2.2 to 2.4 metres thick, and includes four clay and shale partings, 1.2 to 7.6 centimetres thick, and one band of bentonite, 12.7 centimetres thick (Minister of Mines Annual Report 1950, page 264). The deposit is overlain by shale and underlain by sandstone. A second undeveloped coal seam lies 12 metres stratigraphically below. This seam is 1.3 to 1.4 metres thick and contains a 3.8-centimetre thick shale band and a 19-centimetre thick bentonite seam.

The coal is non-coking in character and has a rank of sub- bituminous B. A sample from the face of the main level analyzed as follows (in per cent) (Minister of Mines Annual Report 1949, page 301):

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Moisture 21.2

Volatile matter 31.7

Fixed carbon 38.2

Ash 8.9

Sulphur 0.7

Calorific value 8910

(B.T.U.'s per pound)

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Princeton Coal and Land Company first explored this deposit in 1923. It was initially mined by British Lands Ltd. during 1944 and 1945, after its rediscovery by C. Jackson in 1941. Taylor Burson Coal Company Ltd. reopened the mine in 1948 after closing its previous mine to the north (Taylor Burson Coal, 092HSE213) in the same year. The company abandoned this mine in 1951. A total of 12,334 tonnes of coal was produced between 1944 and 1951.