DEVELOPMENT METHOD OF MINERAL RESOURCES BY SPIRAL PIT Russian patent published in 2011 - IPC E21C41/26 

FIELD: mining.

SUBSTANCE: drilling of each inclined pit is started at design distance from the adjacent line of the cross-over to horizon of the first mining operations of mineral resources and along adjacent line of its bottom to mining horizon there performed is entry way of effective length and in the section of its faces and entry way in design coordinates there formed is straightline longitudinal front and during preparation of horizon for drilling of new pit and movement through design distance of longitudinal front of the rock it is developed within design limits with intermediate front which is transverse to common pit or nonconvex to it, and it is continued to be formed in design sequence and interrelation of works; roads on horizons are formed along straightline routes and operations on each below lying horizon are performed beyond the section of adjacent point of its inclined pit to the above lying horizon and design point of the latter aboard the stage and it is mined with entry ways transverse to the board by means of combination of works on formation of the near-board pillar. Analytical relationships and expressions of determination of location of inclined pits and transverse entry ways, parameters, sequence and combination of works and the limits restricting them are specified.

EFFECT: increasing efficiency and intensity of development of pits by rational opening of horizons and mineral resources.

6 dwg, 1 tbl