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Updated: October 1, 2026
They are often altered into a kind of chert. At Muara there is an outcrop of coal seams twenty, twenty-five and twenty-six feet thick. The coal is of excellent quality, quite bitumenised, and not brittle. The beds are being worked by private enterprise. I saw no fossils, but the beds and the coal reminded me much of the older Australian coals along the Hunter river. The mines are of great value.