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Bureau of Mines / Minerals yearbook: Metals and minerals 1977
Year 1977, Volume 1 (1977)

Haines, Stanley K.
Mica,   pp. 635-643 ff. PDF (820.7 KB)


Page 635

  635Mica 
By Stanley K. Haines1 
 Sheet mica production was limited to a 
small quantity of hand-picked low-quality 
muscovite from North Carolina. Domestic 
scrap and flake mica production increased 
25% and sales of ground mica increased 
23% in 1977. 
 Fabrication of block and ifim mica declined for the fourth consecutive year
to 448,000 pounds, a 16% decrease. Consumption of mica splittings dropped
18% to the lowest level since 1939. Exports of all forms of mica increased
13% in quantity but decreased 
6% in value. Imports of all forms of mica declined, led by a decline of 44%
in imports of waste and scrap mica. 
 Legislation and Government Programs.—Sales of excess sheet mica
by
the General Service Administration (GSA) amounted to 630,000 pounds. The
sale of 62,181 pounds of muscovite film depleted the current quantity authorized
for disposal. Muscovite and phlogopite block sales remained frozen. 
Table 1.—Salient mica statistics 
1973 
1974 
1975 
1976 
1977 
United States: 
Production (sold or used by producing companies): 
 Sheetmica thousand pounds__  Value thousands.~ Scrap and flake mica thousand
short tons.. — 
30 
$15 
153 
20 
$10 
137 
5 
$3 
135 
5 
$3 
r141 
1 
(1) 
176 
 Value thousands..._ 
Ground mica thousand short tons... — 
$6,082 
137 
$5,475 
117 
$5,219 
115 
r$5,765 r133 
$6,480 
163 
Value thousands...... 
$9,464 
$10,171 
$9,381 
~$10,305 
$12,196 
Consumption: 
 Block and film thousand pounds.. - 
 Value thousands..... 
 Splittings thousand pounds..._ 
 Value thousands.._ 
 Exports thousand short tons.._ 
 Imports do____ 
World production thousand pounds... — 
1,265 
$2,106 
5,178 
$1,715 
8 
6 
525,709 
974 
$2,015 
6,186 
$2,801 
9 
7 
515,916 
623 
$1,608 
4,746 
$2,634 
6 
8 
r491872 
534 
$1,413 
5,025 
$3,226 
8 
5 
r494,596 
448 
$990 
4,144 
$2,718 
10 
4 
587,437 
~Revtsed. 
1Less than 1/2 unit. 
Table 2.—Defense Materials Inventory for sheet mica as of December
31, 1977 
(Pounds) 
te~Or3' 
Stockpile 
goal 
Total 
inventory 
Total 
excess 
Balance of 
au~~ion 
Bald m 
1977 
Muscoviteblock,Stainedorbetter             
Muscovitefllm,lstand2dqualities            
Muscovite splittings                       
Phiogopiteblock                         
Phiogopite splittings                       
6,188,000 
90,000 
12,631,000 
206,064 
932,000 
5,108,133 
1,267,779 
22,111,961 
127,773 
2,911,301 
1,177,779 
9,480,961 
1,979,301 
3,052,086 
1,611,301 
62,181 
430,380 
~ 
136,652 


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