Erdene Resource Development Corp has received positive metallurgical results for samples from its Altan Nar Gold-Silver-Lead-Zinc project in southwest Mongolia.

The test work supports the production of either gold-silver dore or marketable-grade metal concentrates being produced using conventional processing methods.

The metallurgical test work was conducted by Blue Coast Research to evaluate processing options for the production of gold-silver dore on site through gravity and leaching, and/or production of gold and silver in lead-zinc concentrates through flotation.

The test work was completed on representative drill core composites from the Discovery Zone North deposit at the Altan Nar project. These metallurgical test results are now being utilized in northern China marketing studies for the sale of high-grade concentrates and in a Strategic Options Analysis study being carried out by RungePincockMinarco Limited (RPM).

The tests showed:

  • The gold responded very well to direct leaching with recoveries of 88%, indicating the gold is free milling and does not contain a significant refractory component.
  • High-grade gold-lead-silver concentrates (229 grams/tonne gold, 62% lead, 1029 grams/tonne silver) can be produced with reasonable overall recoveries (75% gold, 74% lead, 64% silver) using conventional lead-zinc differential flotation.
  • Good zinc concentrates can be produced grading 50% zinc at 61% recovery
  • A moderate amount (45%) of gravity recoverable gold is present, albeit at lower concentrate grades (37 grams/tonne gold).

“These results are very encouraging. The high affinity of gold to the lead concentrate is promising as these concentrates generally fetch excellent payment terms,” said Erdene’s president and CEO Peter Akerley.

“As with our maiden resource estimate in the first quarter, these results continue to validate Altan Nar’s potential and allow us to expand our evaluation studies aimed at advancing the project further towards production.”

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