Agricola, Georgius, De re metallica, 1912/1950

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1best are those which, on the contrary, extend from the VI or VII direction
of the west to the VI or VII direction of the east, through the slope of a
mountain which similarly inclines to the north.
whose hangingwalls
are also in the south, whose footwalls are in the north, and whose
heads rise toward the north; and lastly, whose rock seams raise
their heads toward the west.
In the third place, they recommend those
veins which extend from XII north to XII south, through the slope
of a mountain which faces east; whose hangingwalls are in the
west, whose footwalls are in the east; whose heads rise toward
the east; and whose rock seams raise their heads toward the north.
Therefore they devote all their energies to those veins, and give very little
or nothing to those whose heads, or the heads of whose rock seams rise
toward the south or west.
For although they say these veins someĀ­
times show bright specks of pure metal adhering to the stones, or they come
upon lumps of metal, yet these are so few and far between that despite them
it is not worth the trouble to excavate such veins; and miners who persevere
in digging in the hope of coming upon a quantity of metal, always lose their
time and trouble.
And they say that from veins of this kind, since the sun's
rays draw out the metallic material, very little metal is gained.
But in
this matter the actual experience of the miners who thus judge of the veins
does not always agree with their opinions, nor is their reasoning sound;
since indeed the veins which run from east to west through the slope of a
mountain which inclines to the south, whose heads rise likewise to the
south, are not less charged with metals, than those to which miners are
wont to accord the first place in productiveness; as in recent years has been
proved by the St.
Lorentz vein at Abertham, which our countrymen call
Gottsgaab, for they have dug out of it a large quantity of pure silver; and
lately a vein in Annaberg, called by the name of Himmelsch hoz9, has made it

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