COMPLEX COAL FIELD DEVELOPMENT METHOD Russian patent published in 2012 - IPC E21C41/00 

FIELD: mining.

SUBSTANCE: complex development method of coal field involves exploration works determining the availability of the deposit; preliminary survey determining the nature and boundaries of the deposit; detailed survey determining coal reserves, their qualitative characteristics; operational exploration determining not only the structure of coal bed, but also the evaluation of content of impurity elements in coals and their wastes; development of the deposit for the purpose of coal extraction and further processing of the developed coal with removal of valuable and/or toxic impurity elements. At that, operational exploration of the deposit is performed in two stages: the first stage involves run-up with separation of ore-forming contents in ashes of coals of base elements; the second stage involves the run-up only along the elements which are associated with base elements.

EFFECT: improving the efficiency of complex development of coal field owing to running up the coal beds when its survey is performed according to the restricted number of base elements.