THE MINERAL INDUSTRY OF FLORIDA 231 
 
phate mining and reclamation practices were published.3 
 Land-pebble phosphate rock was produced at 21 mines by 11 companies in three
counties. 
 Hard-rock phosphate was not produced in the State during the year. 
 Soft-rock phosphate was produced by five companies at seven mines in three
counties. Total mine production was 35,000 tons, with a P205 content of 7,-

500 tons, valued at $263,000. The material was used for direct application
to the soil, stock and poultry feed, and fertilizer filler. Producing companies
were Howard Phosphate Co., Kellogg Co., Loncala Phosphate Co., Soil Builders,
Inc., and Sun Phosphate Co. 
 The new Chicora mine and phosphateprocessing complex of American Cyanamid
Co. with a capacity of 1.5 million tons was placed in operation. During the
year the company also installed air scrubbers at its Brewster plant to lower
the emission of gaseous fluorides. Late in the year the company closed its
Sydney mine for about 2 months, reportedly for control of its phosphate rock
inventory. 
 Armour Agricultural Chemical Co. operated two mines in Polk County. Development
of the Rockland mine near Fort Meade a joint venture of Armour and Freeport
Sulphur Co.'s, began; a contract was also awarded for construction of a phosphate
rock washer-beneficiation plant at the mine site. This plant will supply
phosphate both to Armour's Fort Meade phosphoric acid facility, and to a
new Freeport Sulphur Co. processing plant being constructed at Convent, La.
A 15-year contract between Freeport Sulphur Co. and Eastern Gas and Fuel
Associates will provide for barge transportation of approximately 2.25 million
tons per year of phosphate rock from the Armour-Freeport complex in Florida
to fertilizer chemical plant at Convent, La. 
 Borden Chemical Co. operated its Tenoroc mine throughout the year and its
new fertilizer complex near Piney Point was placed in operation during the
year; the company also announced construction of additional warehouse facilities
and installation of an automatic fertilizer bagging plant. 
 W. R. Grace & Co., Agricultural Products Division, continued operation
of its Bonny Lake mine. A scrubbing system for recovery of fluorides from
granular 
superphosphate storage was placed in operation at the company's fertilizer
complex near Bartow; the four-stage system will reduce fluoride emission
by 95 percent in a 35,000-ton storage building. 
 International Minerals & Chemical Corp. (IMC) operated three mines,
all in Polk County. The Achan mine reported no production during the year.
The company began production at its new $4 million feed-grade phosphate plant
at Bartow for production of diammonium phosphate and two types of calcium
phosphate; this new plant increased the company's total feed-grade product
capacity in Florida to more than 500,000 tons per year. 
 Mobil Chemical Co. operated three mines, all in Polk County, during the
year. Output from the mines was used in the manufacture of ordinary superphosphate,
triple superphosphate, phosphoric acid; for direct application to the soil;
and in electric furnace manufacture of elemental phosphorus. 
 Occidental Corporation of Florida operated its Suwannee River mine in Hamilton
County, and announced plans to expand its phosphate mining operations in
Hamilton and Columbia Counties beginning in 1968, and also to develop port
facilities along the gulf coast. Other engineering studies were in progress
for new facilities to increase mining capacity by 50 percent at the Suwanee
River mine. 
 Swift & Company operated the Watson and Silver City mines and plants,
both in Polk County, during the year. 
 Minerals Recovery Corp. processed tailings from previous operations at its
Sand Mountain recovery plant near Bartow. 
 U.S. Phosphoric Products, Division Tennessee Corporation (a subsidiary of
Cities Service Oil Co.) began operations of its new Tencor mine and phosphate
ore beneficiation plant near Fort Meade during the year. Plant capacity is
rated at 2 million tons per year, and the new facilities included a preparation
plant 
 
 ~ Cross, W. C. Florida Phosphate Mining Methods. Mm. Cong. J., v. 53, No.
10, October 1967, pp. 27—31. 
 Engineering and Mining Journal. Mine Plan for Total Resource Management.
V. 168, No. 7, July 1967, pp. 77—82. 
 Trauffer, Walter E. Phosphate Industry Expanding at a Record Rate. Pit and
Quarry, v. 
59, No. 10, June 1967, pp. 70—74, 79—86, 183— 
146.