1998 Johannesburg, South Africa
Mine Water and Environmental Impacts 
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1996 Portorož (Portorose), Slovenia
Engineering in Karst 
1995 Denver, USA
Water Resources at Risk 
1993 Chililabombwe, Zambia
1st African Mine Water Symposium 
1990 Lisbon, Portugal
Acid Mine Water in Pyritic Environment 
1987 Katowice, Poland
Hydrogeology of Coal Basins 
1986 Nottingham, United Kingdom
Some Current Ground Water Problems in Mining
1979 Denver/CO, USA
Mine Drainage (1st International Mine Drainage Symposium) 
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