2006-4-24 · Figure 1 Schematic map of environmental impact in the Rudňany ore field 1 - areas of workings present in near-surface zone, 2 - open blows, 3 - spoils, 4 - communal waste, 5 - boundary of area with Hg content in soil from 20 to 50 mg.kg-1, 6 - boundary of area with Hg content in soil over 50 mg.kg-1, 7 - shaft, 8 - main horizontal workings, 9 - exploited karst-fissure springs, 10 - streamflow ...