In-situ Leach Mining Method Using Branched Single Well for Input and Output.
U S Pat 4 222 611 Sept 16 1980 :
A single well head is used to inject the leach solution for in situ mining and to recover the pregnant liquid. The well head has a main vertical well and a number of intersecting branch wells drilled outwardly at an angle of 0-60 deg to the main well. All the wells extend into the ore zone and a pump in the main well controls the flow of solution. The recovery of uranium by dilute acid or alkaline solutions is mentioned.
U.S. Pat. 4,222,611; Sept. 16, 1980; Chem. Abstr. 93:135,826Q