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BLACKBALL COAL MINE - Huge timber support props used to prevent the roof of the underground tunnel from collapsing.ca.1900.
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West Coast New Zealand History (20th Jul 2026). BLACKBALL COAL MINE - Huge timber support props used to prevent the roof of the underground tunnel from collapsing.ca.1900.. In Website West Coast New Zealand History. Retrieved 8th Oct 2026 11:13, from https://westcoast.recollect.co.nz/nodes/view/36403




