Agricola, Georgius
,
De re metallica
,
1912/1950
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best are those which, on the contrary, extend from the VI or VII direction
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of the west to the VI or VII direction of the east, through the slope of a
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mountain which similarly inclines to the north. </
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<
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>whose hangingwalls
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are also in the south, whose footwalls are in the north, and whose
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heads rise toward the north; and lastly, whose rock seams raise
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their heads toward the west. </
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<
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>In the third place, they recommend those
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veins which extend from XII north to XII south, through the slope
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of a mountain which faces east; whose hangingwalls are in the
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west, whose footwalls are in the east; whose heads rise toward
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the east; and whose rock seams raise their heads toward the north.
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<
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>Therefore they devote all their energies to those veins, and give very little
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or nothing to those whose heads, or the heads of whose rock seams rise
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toward the south or west. </
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>For although they say these veins someĀ
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times show bright specks of pure metal adhering to the stones, or they come
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upon lumps of metal, yet these are so few and far between that despite them
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it is not worth the trouble to excavate such veins; and miners who persevere
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in digging in the hope of coming upon a quantity of metal, always lose their
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time and trouble. </
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<
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>And they say that from veins of this kind, since the sun's
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rays draw out the metallic material, very little metal is gained. </
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>But in
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this matter the actual experience of the miners who thus judge of the veins
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does not always agree with their opinions, nor is their reasoning sound;
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since indeed the veins which run from east to west through the slope of a
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mountain which inclines to the south, whose heads rise likewise to the
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south, are not less charged with metals, than those to which miners are
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wont to accord the first place in productiveness; as in recent years has been
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proved by the St. </
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<
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>Lorentz vein at Abertham, which our countrymen call
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Gottsgaab, for they have dug out of it a large quantity of pure silver; and
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lately a vein in Annaberg, called by the name of Himmelsch hoz
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9
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, has made it </
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