The Gila alum contains about 28 per cent…
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chunk 2401 · paragraph 0
The Gila alum contains about 28 per cent
alumina, the balance being water (44 per cent),
sulphuric acid (22 per cent), impurities (sand,
gypsum, etc., 6 per cent) . It is therefore not
what is commonly known as alum, but is hy-
drous sulphate of alumina. To utilize it in mak-
ing aluminum the manufacture should be car-
ried on either at Silver City or Deming, as all
the fluxes and reducing agents, excepting per-
haps salt, exist in abundance in the neighbor-
hood of Silver City, such as fluorspar, pyrites,
copper ore, pyrolusite. Sulphate of alumina is
now manufactured and sold in England, at
$21.75 per ton of 2240 pounds, so that there
would be nothing in shipping the Gila mineral
to the seaboard.