Bureau of Mines / Minerals yearbook: Metals and minerals 1977
Year 1977, Volume 1 (1977)
Potter, Michael J.
Feldspar, nepheline syenite, and aplite, pp. 375-381 ff. PDF (789.5 KB)
375Feldspar, Nepheline Syenite, and Aplite By Michael J. Potter' The quantity of feldspar produced in 1977 (table 1) was slightly lower than in 1976, and some sharp ups and downs took place during the year With the severe winter of 1977 transportation mining activities and gas supplies for customers were severely curtailed Because of these problems there was a temporary shortage of feldspar later in the year when customers began to catch up. Costs of electric power, fuel for drying, and equipment were advancing at the rate of 10% per year or more. Transportation costs of feldspathic products wei~e also steadily advancing. In the latter part of 1977, Indusmin, Ltd., of Canada purchased all shares of LawsonUnited Feldspar and Mineral Co. in Spruce Pine, N.C. Indusmin produces nepheline syenite at Nephton, Ontario.2 Legislation and Government Programs — According to provisions of the Tax Reform Act of 1969, which continued in force throughout 1977, the depletion rate allowed on feldspar production (both domestic and foreign operations) was 14%. Table 1.—Saljent feldspar statistics 1973 1974 1975 1976 1977 United States: Feidsoar produced1 short tona.. — Value thousands... Exports short tons__ Value thousands..... Importsforconsumption short tons_ Value thousands.._ Consumption, apparent3 short tons.. —world production thousand short tona_ — 791,900 $12,830 9,554 $466 367 $26 782,713 3,050 762,723 $11,396 18,319 $662 92 $4 744,496 3,319 669,898 $11,728 9,543 $507 290 $23 660,645 r2,895 739,684 2$17,531 6,144 $352 93 $18 733,633 r2,936 733,963 2$17,186 6,202 $394 242 $8 728,003 3,045 ' Includes hand-cobbed feldspar, flotation-concentrate feldspar, and feldspar in feldspar-silica mixtures. ' Data represent a more refined product and sre not comparable to previous years. 3Measured by quantity produced plus imports, minus exports. FELDSPAR DOMESTIC PRODUCTION The quantity of feldspar in 1977 ready to be put into final form for use (that is, the total quantity of hand-cobbed feldspar, flotation concentrate feldspar, and feldspar content of feldspar-silica mixtures) was down slightly in tonnage and value compared with that of 1976. The values in table 2 for 1976 and 1977 represent a more refined product. Feldspar was mined in 10 States with North Carolina in the lead, followed in descending order by Connecticut, Georgia, California, Oklahoma, South Dakota, Arizona, Wyoming, Colorado, and Maine. The combined output of the first four States named amounted to 93% of the U.S. total. Most of the feldspar used in glassmak.ing is ground no finer than 20 mesh, and
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