Geotechnical Factors Associated With Previously Mined Areas of Coal and Their Impact on Subsequent Extraction
by Lesley Sharon Jeffrey | 2002
Geology and Geophysics
Unconventional Extraction Methods to Harness the Energy and Carbon in Coal
by D.S. Xaba & L.S. Jeffrey | September 2002
Unconventional Extraction Methods to Harness the Energy and Carbon in Coal Read More »
Identify Remnant Coal Deposits for Potential Exploitation by Small Business Developments
by Deborah S Xaba & Lesley S Jeffrey | March 2002
Identify Remnant Coal Deposits for Potential Exploitation by Small Business Developments Read More »
Detection of Old Workings, Sinkholes, Underground Fires and Acid Mine Pollution Using Geophysics and Airborne Thermal Infrared Imagery
by Michael van Schoor | March 2002