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182 MINERAL RESOURCES.
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inclusive,
made a very careful study of the subject, and his results, as published
in his series of admirable reports, are generally accepted, though in a
few cases overestimates, which there was no means of checking, could
not be eliminated. The following table gives Dr. Ray-mond's estimates:
Dr. R. W. Raymond's estimate of the gold and silver product from 1868 to 1875 inclusive
{calendar years).
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Dr. Adolf Soetbeer (in Petermaun's Mittheilungen, Erganzungsheft
No. 57) published conclusions reached by him as to the bullion product
of the United States up to the close of 1875, based upon a study and
comparison of the literature of the subject. In the following table Dr.
Soetbeer's results are shown, kilograms being converted into troy
ounces and German marks into United States money. The production is
given by periods of years.
Dr. Soetbeer's estimate of the production of the precious metals in the United States to the
close of 1875.
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