Bureau of Mines / Minerals yearbook: Metals and minerals 1978-79
Year 1978-79, Volume 1 (1978-1979)
Potter, Michael J.
Feldspar, nepheline, syenite, and aplite, pp. 317-325 ff. PDF (951.4 KB)
Feldspar, Nepheline Syenite, and Aplite By Michael J. Potter1 Feldspar was mined in 10 States in 1978, with North Carolina in the lead followed by Connecticut and Georgia. Other major producing States were California, Oklahoma, and South Dakota. In 1979, only seven States were producers, with Arizona, Colorado, and Maine no longer included. Shipments in both years went to at least 31 States and to foreign destinations such as Canada and Mexico. Aplite of glassmaking quality was produced only in Virginia out put figures are not released, but output increased in 1978 and decreased slightly in 1979. Imports of nepheline syenite increased in 1978 but showed a decrease in 1979 The 1978 end use distribution of total feldspar in the United States indicated 54% going into glassmaking and 39% into pottery. The remaining 7% was used in other applications such as enamels, soaps, sanitary ware, çtc. The 1979 end use distribution of total U.S. feldspar was 55% in glass, 42% in pottery, and 3% in miscellaneous. As a replacement for its old deposit, the Feldspar Corp. was planning to develop a new potash feldspar deposit for its Monticello, Ga., flotation plant. Further process development work was planned, to coincide with property development scheduled for 1979. In Maine, output of potash feldspar ceased from the mill at West Paris In Arizona, the potash feldspar operation at Krngman shut down in the latter part of 1978. In other 1978 developments, the Glass Containers Corp., Div. of Owens-Illinois, Inc., put into operation its most automated plant at Volney, N. Y. Fuel oil and propane are used instead of natural gas.2 In Dayville, Conn., the Glass Containers Corp. was using recycled glass (cullet) as a means of reducing particulate emissions into the air and using less fuel.~ Legislation and Government Programs.— According to provisions of the Tax Reform Act of 1969, which continued in force throughout 1978-79, the depletion rate allowed on feldspar production (both domestic and foreign operations) was 14%. Table 1.—Salient feldspar and nepheline syenite statistics 1975 1976 1977 1978 1979 United States: Feldspar produced' short tons — Value thousands.~Exports short tons. Value thousand&.Imports for consumption short tons — Value thousand&. 2669,900 2739,7W,) 2734,000 2$11,730 2 2$17,530 2 ~$17,190 29,540 26,140 26,200 $507 $352 $394 290 93 242 $23 $18 $8 735,000 2 ~$18,200 10,330 $853 39 $3 740,000 2 ~$21,500 12,300 $1,025 266 $31 Imports for consumption, nepheline syenite short ton&. - Value thousanda... Consumption, apparent4 (feldspar plus nepheline syenite) thousand short tons_. — World production (feldspar) do.. — 431,100 501,200 502,600 $6,967 $8,823 $9,135 1,092 1,235 1,231 2,895 r3,094 T3,239 548,000 $10,446 1,273 3,402 536,000 $10,846 1,264 3,412 r~ ' Includes hand-cobbed feldspar, flotation-concentrate feldspar, and feldspar in feldspar-silica mixtures; also includes potash feldspar (8% K20 or higher). 2Revised to rounded figure. 3Data represent a more refined product and are not comparable to previous years. 317 4Measured by quantity produced plus imports, minus exports (rounded figures).
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