??? ???? ?????? ??? ?? ????? ???? ??? ?????(COD)? 1999? 1.9ppm?? 2000?? 1.8ppm, 2001?? 2.0ppm, ????? 2.2ppm?? ??? ??? ????.

???? ?????? 99? 22.5t?? ??? 600t?? ????? ??? ?????? 2.0ppm?? 2.1ppm?? 0.1ppm? ????. ???? 43.5t?? 100t?? ??? 2.7ppm?? 2.8ppm?? 0.1ppm? ????.

?? ?????? 1999? 4t, 2000? 6.5t, 2001? 40t, ??? 50t ?? ???? ???(???)? ?? ?? 2?? ??? ? ????? ?? ??? ???? 1999? 1.8ppm??? ??? ?????? ????? 1.7ppm?? ??? 0.1ppm? ????.

?? ?? ?????(?? 98%, ????? 2%) ???? ??? ???? ????? ??? ?? ?? ?? ??? ??? ???? ??.

?????? ?? ????? ??? ?? ?????(??? ?? ???)? ?? ??? ????? ?? 470m? ?? ?? ???? ??? ????? ?? 1??? ???? ??? ????? ???? ?? ???? ?? ??? ???? ?? ??.

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