600 tpd Gold Mill Expansion.

Halyard undertook a feasibility study to increase a gold process plant’s throughout from 600 tpd to 1,200 tpd. This was a challenging study because the existing plant had a small footprint, the client was considering additional on-site processing, and Halyard designed 3 separate scenarios for expansion.

The options were:

• Expansion without the addition of leaching.
• Expansion with the addition of a Merrill-Crowe process.
• Expansion with the addition of a carbon-in-leach circuit.

Expansion of the process plant without the addition of on-site leaching was determined to be the most economical and suitable solution to achieve the throughput increase. The study was completed in 4 months with separate process designs, including mass balances, water balances, and equipment sizing for each option. Capital cost estimates for mechanical equipment, civil works, structural steel, and electrical were generated for each process option within the tight timeline. 

Halyard were responsible for sections 13 and 17 of the NI 43-101 feasibility study technical report and sign-off by the relevant Qualified Persons (QPs).