Christopher J. Schenk Timothy R. Klett Janet K. Pitman Marilyn E. Tennyson Stephanie B. Gaswirth Phuong A. Le Heidi M. Leathers-Miller Tracey J. Mercier Thomas M. Finn Michael E. Brownfield 2016 <p>Using a geology-based assessment methodology, the U.S. Geological Survey estimated undiscovered, technically recoverable mean resource of 44.5 trillion cubic feet of shale gas in the Karoo Province of South Africa and Lesotho, Africa.</p> application/pdf 10.3133/fs20163038 en U.S. Geological Survey Assessment of shale-gas resources of the Karoo Province, South Africa and Lesotho, Africa, 2016 reports