After testing almost every drip emitter manufactured, management could not find a drip emitter that could operate very long  before plugging.  It seems that nitrate operations have a large quantity of suspended solids, dissolved solids, etc. in their leach solution making drip emitter use very difficult.  Management’s goal to convert from sprinkler leaching to drip emitters was to reduce leach solution evaporation rates so additional leach areas could be brought under leach with the existing fresh water supply, effectively increasing mineral production. 

A Max-Emitter test was tried on a complete new leach area with the same application rate used with the normal sprinkler leaching.  The Max-Emitter test area was watched closely throughout the test because everyone was expecting it to plug as ever other drip emitter tested before it had.  However, when the leach cycle was complete, the Max-Emitter test area did not have any significant plugging. 

Mineral PLS grade from the heap had been much higher than ever experienced with sprinkler leaching, leading to improvements in the extraction plant’s recoveries and lowering operating costs.  Additionally, evaporation losses were calculated to be almost half of that experienced with sprinklers, fresh water consumption would be cut in half for each new leach area.