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  1. $Title{Table 11: Production and Reserves of Major Minerals, Selected Years, 1971-81 (in thousands of tons unless otherwise specified)}
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  4.                                    Production
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  6.       Mineral          1971          1980          1981          Reserves
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  8. Coal...............       40           324          370            103,000
  9. Crude petroleum....       -            535          n.a.            n.a.
  10. Copper concentrate       199           305          302          3,940,000
  11. Chromite...........      150           354          337             73,000
  12. Iron ores..........    1,381            -             -          4,070,000
  13. Cement materials...    3,948        10,100          n.a.         5,300,000
  14. Silicon............       34           104          n.a.         1,061,000
  15. Gold (in tons).....       20            20           18          1,665,000
  16. Silver (in tons)...       60            61           47             n.a.
  17. Nickel.............       -             25          n.a.         1,479,000
  18. Molybdenum.........        4            90          n.a.            71,000
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