Agricola, Georgius
,
De re metallica
,
1912/1950
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[Figure 312]
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worked, though they were not deficient in silver. </
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<
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>The fifth cause are the
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fierce and murderous demons, for if they cannot be expelled, no one escapes
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from them. </
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>The sixth cause is that the underpinnings become loosened
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and collapse, and a fall of the mountain usually follows; the underpinnings
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are then only restored when the vein is very rich in metal. </
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>The seventh
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cause is military operations. </
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>Shafts and tunnels should not be re-opened
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unless we are quite certain of the reasons why the miners have deserted them,
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because we ought not to believe that our ancestors were so indolent and
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spiritless as to desert mines which could have been carried on with profit.
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<
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>Indeed, in our own days, not a few miners, persuaded by old women's tales,
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have re-opened deserted shafts and lost their time and trouble. </
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>Therefore,
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to prevent future generations from being led to act in such a way, it is
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advisable to set down in writing the reason why the digging of each shaft or
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tunnel has been abandoned, just as it is agreed was once done at Freiberg,
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when the shafts were deserted on account of the great inrush of water.</
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>END OF BOOK VI.</
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