$PGLC / $V.PGLC Metallurgy Pershing Gold has p

$PGLC / $V.PGLC Metallurgy

Pershing Gold has performed extensive metallurgical test work, most of which has been conducted at McClelland Laboratories, Inc. in Sparks, Nevada. These tests include 70 bottle-roll tests, 19 column-leach tests and 18 load-permeability (hydraulic conductivity) tests. This work demonstrates that the Relief Canyon mineralized material is amenable to heap leach processing. Key findings from these tests include the following:

The individual column leach testing of the nine mineralization types present, as well as composites with 2016 resource model-weighted contributions from the various types, showed an overall average recovery of 80% for crushed and agglomerated material.
Most of the mineralization types to be processed will require agglomeration.
The Relief Canyon material recovery is not very sensitive to crush size. This relative lack of crush size sensitivity supports the proposed plan for single-stage crushing to 80% minus three-inch size. The crushing plant will have an annual throughput capacity of about 5.4 million tons.
Run-of-mine processing should be possible, but would be limited to low grade, low fines material. Column testing supports the 60% recovery rate assumed for run-of-mine processing.
The PEA assumes treatment of approximately 78% of the mineralized material tonnage by crush and agglomeration, with the remaining 22% treated as run-of-mine.
The lower grade of run-of-mine material equates to about 6% of recovered gold with the remaining 94% of recovered gold resulting from processing of crushed and agglomerated material.

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