Hawker-Siddley's DOSCO subsidiary announced in 1965 that its mines had only 15 years of production left and concluded that opening new underground mines in the Sydney Coal Field would be too expensive.
Hawker-Siddley's DOSCO subsidiary announced in 1965 that its mines had only 15 years of production left and concluded that expense of opening new underground mines in the Sydney Coal Field would be too expensive.
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