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During
1914 the average price of the various platinum-group metals was
approximately as shown below, which figures have been used by the
United States Geological Survey in all computations.
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No
quotations of prices of the remaining metals of the platinum
group—osmium, rhodium, and ruthenium—are available, and probably any
sales were private. These metals are scarce and have little commercial
use, and it seems probable that very small quantities, if any, were
marketed in 1914.
PRICE OF CRUDE PLATINUM.
Domestic.—As
stated in the report for 1913 the crude platinum concentrates produced
in the placer fields of the United States contain, as a rule, some
valueless sand grains; also the grains of the
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