A
sample of heavy concentrates from placer mining near Yacolt, Wash., on
examination showed small quantities of gold and about one-sixth as much
platinum as gold. No gold or platinum was found in any of the sand
coarser than 100 mesh.
REFINED PLATINUM.
A
considerable output of platinum is annually made in the United States
from the refining of gold and copper bullion. A portion of this
platinum originates in old scrap, sweepings, etc., sold by jewelÂers
and dentists. About 650 fine ounces, however, was derived in 1913 as
new metal from gold and copper bullion from domestic mines. No output
of platinum concentrates was reported from plat-iniferous lodes of the
United States in 1913.
In
1913 crude platinum sand was imported into the United States to the
amount of 48,942 ounces. If the content of fine platinum in this sand
is assumed to be 80 per cent, the approximate production of refined
platinum in the United States in domestic refineries from foreign sands
in 1913 was 39,154 ounces.
Production of refined platinum from domestic sources, 1903-1913, in troy ounces.
