Page 460 - calmining1890

434 REPORT OF THE STATE MINERALOGIST.

DUNCAN HILL DISTRICT.

This district is to the north and .ea^rrf the Ophir District and west
of the town of Auburn. •• " ",?!
The formation is metamorphic slate, hornblende, talc, mica, and
chlorite schists, and occasional dikes ofdiorite.
There are thirty or more mines and locations in the district, all of
which have been more or less worked to depths varying from fifty to
three hundred feet. The veins are usually found in contacts, and the
ores resemble those of the Ophir District, but do not carry so large a
percentage of sulphurets.
The only mine at work in the district is the one owned by the White
Bros., who are taking out ore very rich in free gold, but refused positively
to allow an examination of the mine, or to furnish any data whatever
for publication.