A Great Deal Of Chemical Action Then
Commences, Salts Of Various Kinds Effloresce On The Surface,
And The Mass Becomes Hard.
After having been left for a year
or two, and then rewashed, it yields gold; and this process
may be repeated even six or seven times; but the gold each
time becomes less in quantity, and the intervals required (as
the inhabitants say, to generate the metal) are longer.
There
can be no doubt that the chemical action, already mentioned,
each time liberates fresh gold from some combination. The
discovery of a method to effect this before the first grinding
would without doubt raise the value of gold-ores many fold.
It is curious to find how the minute particles of gold, being
scattered about and not corroding, at last accumulate in
some quantity. A short time since a few miners, being out of
work, obtained permission to scrape the ground round the
house and mills; they washed the earth thus got together, and
so procured thirty dollars' worth of gold. This is an exact
counterpart of what takes place in nature. Mountains suffer
degradation and wear away, and with them the metallic veins
which they contain. The hardest rock is worn into impalpable
mud, the ordinary metals oxidate, and both are removed;
but gold, platina, and a few others are nearly indestructible,
and from their weight, sinking to the bottom, are left behind.
After whole mountains have passed through this grinding
mill, and have been washed by the hand of nature, the residue
becomes metalliferous, and man finds it worth his while to
complete the task of separation.
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