The PLP plant processes the existing plant tails, feeding a sequential flotation and leach circuit with precious metals recovered through a Merrill Crowe process
, producing dore as the final product.
This Merrill Crowe Process
Facility has reportedly been expanded and upgraded to accommodate the current Lucerne Mine production plan as well as the increased production capacity of an expanded mine.
The permit will allow for the expansion of Merrill Crowe Process
Building and related processes, including the heap-leach pads.
The company believes that previous estimates can be reduced by about $20 million with minimal impact on production by reducing the number of leach tanks, building a smaller Merrill Crowe process
plant/refinery, using modular crushers, and reducing the number of transformers.
Due to the presence of zinc-cyanide complexes in mill tailings resulting from the Merrill Crowe process
, cyanide is stripped at a pH of approximately 5.5.
Dump leaching and the Merrill Crowe process
were selected for gold recovery.
The project envisages open pit operations with a processing plant that includes both Carbon-in-Pulp (CIP) and Merrill Crowe processes
, due to the high silver content of the ore.
While clear solution would result from railings pond overflow, heap-leach operations, or Merrill Crowe processes
. The treatment processes considered are Cyanisorb, alkaline chlorination, S[O.sub.2]/air, and hydrogen peroxide, which account for a majority of treatment processes in current operation.