GOLD, ETC.~ IN CALIFORNIA, NEVADA, AND OREGON 133

500,000 0UllC~5 compared with $682,246 in gold and 1,352,509 ounces of silver
in 1931. Mines in the TonOpah, Manhattan, and Round Mountain districts were
operated by lessees. In the Manhattan district the White Caps Gold Mining
Co. was the principal producer of ore, and lessees shipped about 5,000 tons
of gold ore to smelters in Utah. Ore from the Nevada Coalition Gold Mines
Co. property and various other lode claims worked by lessees was treated
in the War Eagle stamp-amalgamation mill. The placer output was much larger
than in 1931. At Tybo no new ore was produced, but (according to the annual
report of the Treadwell Yukon Co. for 1932) 4,491 tons of zinc concentrate
were in storage at the end of the year. The concentrate assayed 0.037 ounce
of gold, 12.75 ounces of silver, 1.94 percent of lead, and 49.23 percent
of zinc to the ton. The company discontinued development at Tybo and other
properties in Nevada on October 1.
 At Round Mountain, lode mines and placers produced gold and silver valued
at $518,386 in 1932 compared with $408,910 in 1931 and $203,159 in 1930.
The Gold Hill Development Co., according to its annual report for 1932, opened
up its property with an additional 3,503 feet, part.of which was on the deepest
level of the mine. Further progress in sinking or crosscutting to the Gold
Hill vein was brought to a halt at a depth of 645 feet owing to an excessive
flow of water. All available commercial ore, except portions of the shaft
pillars, was practically exhausted at the end of the year. Due to conditions
requiring additional pumping fa~ilities the company recommended discontinuance
of operations in the mine and closed the mill. The output of the Gold Hifi
mine for 1932 was 38,050 dry tons of ore, which was milled in the company
cyathdation plant and averaged 0.337 ounce of gold and 1.91 ounces of silver,
valued at $7.494, a ton. The recovered bullion contained 11,755.02 ounces
of gold and 34,898 ounces of silver, representing 91.59 percent of the total
gold and 47.87 percent of the silver. The average cost of milling was $2.196
a ton and that of mining $3.94 a ton, which includes a stoping cost of $3.15
a ton and a development cost of $0.787 a ton.
 During repairs to its Sunnyside stamp-amalgamation mill the Nevada Porphyry
Gold Mines, Inc., at Round Mountain slowed down operations, but its placers
were worked continuously. Water for placer mining was piped 9 miles from
the Toyabe Range. Some gold was recovered by amalgamation from ore of the
Monte Cristo Mine, the owner of which operated a small tube mill. About 300
feet of development work was done in the mine.
 In Pershing County most of the mine production was from the Seven Troughs
and adjoining districts. The Seven Troughs mine and large cyanidation plant
remained closed. Some placer gold was reported from small dry-washing operations
in the Humboldt district near Imlay. Placer ground also was worked in the
Rosebud and Sierra districts but with indifferent success.
 In Washoe County the White Horse district was the largest producer of gold
from the operations of many lessees who worked in various properties of the
district, chiefly the Springfield mine. The ore was treated in the Springfield
amalgamation mifi.
 In White Pine County the value and quantity of the mine production of metals
was substantially less than in 1931, but the total value exceeded that of
any other county in Nevada. Ten lode mines m the