The tests were conducted on sample composites from the Erato pit - one of the zones at Amulsar - and showed gold recoveries ranging from 88% to 95%.
Further tests, which included adding material from the Tigranes/ Artavasdes areas, to make a single composite, were aimed at assessing the effects of a cold climate on the leaching process.
"These results are consistent with previous work conducted by the company and demonstrate that, although the leach performance at Amulsar will vary depending on the climatic conditions, ultimate recovery appears to be independent of temperature," Lydian said in a statement.
Testing suggested that leaching would slow in the winter and then rise in the spring, providing what it called a "slug" of gold in the spring.
Chief operating officer Marc Leduc said: "The latest metallurgical results reinforce the suitability of the company’s current Amulsar project model, including the use of heap leach technology."
He added: "We are now focused on incorporating these higher recoveries and lower reagent consumption rates in an updated feasibility study that is targeted for completion in the second quarter of 2014.”
Last week, Lydian revealed it had now received the key sign-off required for a heap leach facility at the project.
A joint working group between the company and the government has finished and a new location for the heap leach - a valley fill heap - has been endorsed, Lydian told investors.
An alternative site was sought after a government resolution applied a buffer zone across a water tunnel at the project, but the latest location does not conflict with any national laws or regulations.