The present disclosure provides a method comprising determining an ore map for a heap to identify a location of a recoverable metal value in the heap, delivering a leaching solution from a leaching solution source to a leaching solution regulating system, regulating at least one of a pressure, a mass flow rate, or a volumetric flow rate of the leaching solution to achieve a first target operational condition, wherein the first target operational condition is selected to optimize a set of operational parameters to maximize recovery of the recoverable metal value, delivering the leaching solution at the first target operational condition from the leaching solution regulating system to a subsurface leaching distribution system, and delivering the leaching solution at the first target operational condition from the subsurface leaching distribution system to the location of the recoverable metal value under a surface of the heap to leach and recover at least one metal value.

The present invention belongs to the technical field of coal transportation on fully mechanized mining faces, and particularly relates to a double-end chain tension force control system for a cross side-dumping type flight conveyor and a control method therefor. The double-end chain tension force control system includes a tail tensioning system, connected to a reversed loader at a tail of the flight conveyor; a head tensioning system, connected to a head of the flight conveyor, where the tail tensioning system and the head tensioning system together achieve double-end coordinated control of a chain transmission system on the flight conveyor to adjust a tension force; and a control system, collecting information about the tail tensioning system and the head tensioning system and controlling same. According to the present invention, a telescopic head mechanism for the cross side-dumping type flight conveyor is designed, and the double-end coordinated control of the chain transmission system can be achieved to rapidly adjust the tension force.