El medio ambiente en la minería

119 >2ejlg/g 9 15-20..../9 O <lS)..I''''ca 6AIILE 1V1Q PER G. BROMAN 19B? Figure 7: Arsenic content in zooplankton, 1979 and 1987 (from Repon N~38, Swedisb Environmental Protection Agency). These examples comprise onlya small part of the material established through control activities. The information points unmistakably in one direction, that measures to limit emissions have resulted in obvious improvements in the smelter's surroundings. Bearing inmind the slownesswithwhich such improve– ments are taking place, the environmental improvements demonstrated are largely attributable to the emission limitations that were implemented during the period up to the mid-1980s. In our judgement, the successive improve– ments we expect to occur should be considered the results of emission reduc– tions already implemented, and as the results of further measures now in the planning stage. IV. ANENVIRONMENTAL PERSPECTIVE 1have attemptedverybriefiy to illustrate how technical, Uírget-oriented efforts were applied lo a specific envirorimental challenge at the Ronnskar smelter, and how the environment began, in important respects, to respond positively to these measures. But this presentation would be incompletewithout placing the smelter's enVÍronmental impact in a broader perspective. The general environmental monitoring efforts in Sweden have yielded a great deal of valuable information. One of the most valuable elements of information is knowledge concerning the relative importance of the various