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N Modern Coal Mining Equipment

N Modern Coal Mining Equipment

2020-5-15Most of the gold won in the 1860s was found in rich surface gravels and was worked by individuals or small groups using simple equipment. The richer and most accessible ground was quickly exhausted and larger-scale mining started in the 1870s. Alluvial gold was sluiced and dredged and hard-rock gold and coal were worked in underground mines

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