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Proving Mineral Field
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Description: "The principle of proving a mineral field by boring is illustrated in [the illustration], which represents a line direct from the dip to the rise of the field, the inclination of the strata being one in eight." -Britannica, 1910
Source: Encyclopaedia Britannica (11th ed., vol. 6) (New York: The Encyclopaedia Britannica Company, 1910) 6:580
Keywords: proving mineral field, mining, shaft
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