This is the cheapest of the three caving systems, but is applicable only when the deposit lies between walls of very solid rock, as otherwise wall rock is liable to cave with and become mixed with ore, which adds greatly to the expense of handling. [Please select]
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That's better," he continued as the captain, caving, dropped his fists and moved uneasily back." [Please select]
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The boys dared not go close to the edge for fear of starting the sand caving. [Please select]
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The crowd began caving at the edge and jamming at the centre. [Please select]
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To see a tunnel caving in, portends failure and malignant enemies. [Please select]
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A narrow ledge cut along the walls of a trench to prevent earth from caving in. [Please select]
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A tree grew on the banks of the mud volcano, the sudden caving in of which, under the professor's weight, had precipitated him into it. [Please select]
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