El medio ambiente en la minería

EL MEDIO AMBIENTE EN LA MINERlA 120 contammation sourccs. 1\3 1 mentioned at the beginning, the initial environ~ mental~ntrol efforts focosed on industrial and municipal point sourccs. In pace with the reduction of tbese point sources, and tbe availability of new knowledge, a somewhat different problem..structure has emerged. For ex~ ample, fallout of sulphur and metals on Sweden is overwhelmingly of foreign origino The predominant southwesterly wind bears contaminated air from continental Europe and Great Britain to Sweden's atmosphere. For example, abaut 90 percent of sulpbur fallout has been ascertained to originate outside Sweden. In addition to tbis Iong-range transport of contaminants, tbere is an increased focos on other sources oC the contaminadon build~up. Among these S (Kglha.e) .. Typical \/alua ContinlH'ltll Eurapll 58 48 38- 28· ..4-- Typical value Soutlt af SlEden 18- 4' .~ O-.po.il.íon Era. Rórww.I«..... S ....1t• ..- o 4 8!-____-.__ ~--=~~~~~~~~8~,~S 1 I 16 8 12 Typical Value North S-den DUtance 1rD" the saeltcr (KM) Figure 8: Result of sulphur deposition modeUing al vanous distances north from the Rónnskir smelter, at 3D emission level of 5,000 toDS of S02lye~. Other typical deposition levels are indicated for refer– enoo.