By George Frederick Kunz.
the last report on this subject was prepared, definite and systematic
mining has been carried on at seven places in the United States, viz:
Near Los Cerrillos and in Grant county, New Mexico, for turquoise with
much success and profit; extensively for sapphire in connection with
gold on the Missouri river, near Helena, Montana, with what commercial
success is not known; for opal, with fair success, at Gem City,
Washington State; for tourmaline at Mount Apatite and Mount Mica, both
in Auburn, Maine, and for emeralds and lithia emerald in Alexander
county, North Carolina, during 1891, but with little success.
Production.—The following table gives the output of the various gems and precious stones during 1891:
Product of rough gems before cutting, for the year 1891.