672 MINERALS YEARBOOK, 1972 
 
stalled to supply matte to two converters; new roasters and a pelletizing
plant were constructed near the Copperhill smelter, and a new 1,800-ton-per-day
contact sulfuric acid plant was built. 
 Ferroalloys.—Six companies produced ferroalloys in Marion, Maury,
Roane, and Shelby Counties. The plants in Maury County produced ferrophosphorus
as a byproduct in making phosphorus; the plant in Marion County produced
ferrosilicon; the plant in Roane County produced ferromanganese, ferrosilicon,
and silicomanganese; and the Shelby County plant produced ferromanganese,
fei-rosilicon, silicomanganese, ferrochromium, and ferrochromiumsilicon.

 Shipments of ferroalloys in 1972 were 217,000 tons valued at $33.9 million.
Value per ton decreased from that of last year by 15%. 
 During the year, International Utilities Corp. purchased Tennessee Metallurgical
Co., which had production of about 30,000 tons of ferrosilicon per year and
some silicon metal. Headquarters were in Chattanooga and the plant was located
at Kimball in Marion County. 
 Gold.—Gold recovered at out-of-State refineries was a byproduct of
refined copper from the Cities Service Co. Copperhill operations. The yield
decreased from 192 troy ounces to 176 troy ounces in 1972; however, with
the increase in the price of gold during the year, the production value increasd
from $7,920 in 1971 to $10,314 in 1972. 
 Magncsium.—Tennessee Die Casting Corp. at Ripley expanded its facilities
to produce magnesium die castings. The company planned to expand its Ripley,
Tenn., facilities by 8,000 square feet. 
 Manganese.—Foote Mineral Co. made production improvements during the
year at its electrolytic manganese plant in New Johnsonville. The improvements
partially offset increased labor, raw material, and power costs. Sales of
electrolytic manganese in chip form and in the form of manganesealuminum
briquets increased moderately over 1971 levels. 
 Silver.—Silver recovered at out-of-State refineries was a byproduct
of refining copper from the Cities Services Co. Copperhill operations. Quantity
and value of silver produced both decreased from that of last year—quantity
declined 36% to 83,466 troy ounces and value declined 31% to $140,640. 
 Titanium.—E. I. duPont de Nemours and Co., Inc., continued production
of titanium dioxide pigments from concentrates from Florida, Georgia, New
Jersey, and Australia. Capacity of the New Johnsonville plant was increased
by 45,000 tons per year during the first quarter of 1972, which brought the
annual capacity of the plant to 141,000 tons. Further expansion is underway
for another 55,000 tons per year with expected completion for 18,000 tons
planned for midyear 1973 and 37,000 tons by yearend 1973. In. order to dispose
of the effluent (aqueous solution of ferric chloride) produced, three deep
waste disposal holes have been drilled into the Knox Dolomite since 1967.
Initially 250 to 300 gallons per minute were being injected into the subsurface
below 3,000 feet. Except for short shutdown periods, injection of this effluent
at about the same rate has continued over the approximate 5 year period.
Hole 1 has been abandoned. Holes 2 and number 3 are presently operative.
Plans are being made to drill Hole 4. 
 Zinc.—Tennessee led the Nation in zinc production for the 15th consecutive
year with 101,722 short tons, 21% of the zinc produced in the United States.
Value of zinc produced was $36.1 million which ranked fourth in all the minerals
produced in the State for 1972. 
 Three companies mined zinc ore from seven mines in Hancock, Jefferson, and
Knox Counties in eastern Tennessee. Cities Service Co. Copperhill operations
also produced zinc concentrates from its plant in Polk County. 
 The American Smelting and Refining Company (ASARCO) temporarily closed its
Coy mine near Jefferson City in August. This mine went into full production
in January 1959, but output decreased gradually over the last few years.
The Mascot Mill, which has operated since 1913, is being replaced by a new
mill with 20% more capacity at the Young mine. Scheduled completion date
for the new mill will be mid-1974. This mill will process ore from the Young,
Coy, and Immel mines. The ore from the New Market mine was processed at its
own mill. Zinc reserves at ASARCO Tennessee mines have been estimated at
over 77 million tons of ore averaging 3% to 4% zinc. Two valuable mill products
are marketed by ASARCO American Limestone Co. The tailings were used for
agricul