A method for the in situ processing of oil shale ore includes the establishment of underground stopes by removing from each a portion of the oil shale ore therein, rubblizing the remaining ore in each stope, extracting the rubblized ore and crushing it to obtain a desired particle size for subsequent...http://www.google.de/patents/US4379593?utm_source=gb-gplus-sharePatent US4379593 - Method for in situ shale oil recovery
