Agricola, Georgius
,
De re metallica
,
1912/1950
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<
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>A—SOLID VEIN. B—SOLID STRINGER. C—CAVERNOUS VEIN. D—CAVERNOUS
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STRINGER. E—BARREN VEIN. F—BARREN STRINGER.</
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>But to return to veins. </
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>A great number of miners consider
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8
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that the
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best veins in depth are those which run from the VI or VII direction of the
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east to the VI or VII direction of the west, through a mountain slope which
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inclines to the north; and whose hangingwalls are in the south, and whose
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footwalls are in the north, and which have their heads rising to the north,
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as explained before, always like the footwall, and finally, whose rock
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seams turn their heads to the east. </
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<
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>And the veins which are the next </
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