Since deposition, coal-bearing strata are subjected to a stress field. The magnitude and direction of the field varies through geologic time as evident by highly deformed strata in some deposits. Various factors control the current state of the stress field, and CBM and coal mining operations are directly influenced by its direction and magnitude. Some basins reflect relatively weak fields, whereas, others can have high stress magnitudes related to a particular tectonic setting. As mines get deeper, coping with stress-related problems becomes more important in assuring cost-effective coal extraction. The prevention of personnel injuries, equipment damage, and even loss of the full investment of the mine depends on the recognition and mitigation of stress (Collins, 1991).
Figures & Tables
This volume of the “Atlas of Coal Geology” provides 393 images on various subject matters related to coal deposits and coal resource utilization. The supporting text provides an introductory overview of coal exploration, mining, and coalbed methane (CBM) development, followed by discussions on various megascopic aspects of coal geology (microscopic aspects are covered in Volume 2). Because of the vast subject matter, many generalities had to be made in the text. References are included to guide those interested to more detailed discussions. All citations within the document are linked to the detailed reference list for this volume. The overriding theme for this publication is that a picture is worth a thousand words.