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    Figure 3 This picture shows an alluvial mine of an ancient onshore beach terrace. Notice the depth of the sediment in which the diamonds are contained.

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    1. Introduction. The construction of an excavation often means penetrating the local or regional groundwater table which may cause water inrush into the excavation

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    Prepared by the Joint Ore Reserves Committee of The Australasian Institute of Mining for alluvial gold deposits and analytical techniques relevant to the

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    Figure 3 This picture shows an alluvial mine of an ancient onshore beach terrace. Notice the depth of the sediment in which the diamonds are contained.

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