| Company | Unknown |
| Date | Unknown |
| Region | Not Specified |
| Commodities | Silver |
| Mine Type | Not Specified |
| Throughput | 12,000 tpd |
| Status | PEA (Pre-Feasibility Study) |
Executive Summary
Section 17 of the technical report outlines the selected mineral processing flowsheet for the Silver Sand project based on metallurgical testwork results. After evaluating several options including heap leaching, froth flotation, and agitated tank cyanidation, an agitated tank cyanidation process was chosen for the PEA base case. This selection prioritizes a conventional, low-risk approach to silver extraction, balancing capital cost, operating cost, and metallurgical efficiency.
The processing plant design includes ROM receiving, crushing, and storage, followed by grinding via SAG milling and ball milling. A pebble crushing circuit utilizing cone crushers and scalping screens is integrated to manage SAG mill pebbles. The leaching stage employs pre-leach thickening and cyanide leaching in stirred, oxygen sparged tanks, followed by liquid/solid separation using counter-current decantation thickeners.
Silver recovery from the pregnant leach solution is achieved through a zinc precipitation process, followed by drying and smelting to produce silver doré bars. The process concludes with thickening and filtration of leach residues, with the filter cake conveyed to long-term storage at the tailing storage area. The processing rate is designed to match the mine production rate of 12,000 tpd.
Website: https://www.newpacificmetals.com/new-pacific-metals-reports-results-of-its-pre-feasibility-study-of-the-silver-sand-project-post-tax-us740-npv-5-37-irr-157-million-ounces-of-silver/
Report Date: Unknown
Region: Not Specified
Project Status: PEA (Pre-Feasibility Study)
Commodity: Silver
Throughput: 12,000 tpd
Mine Life:
Mine Type: Not Specified
Ore type: Not Specified
Technical report and processing history
The following archived source profiles have been consolidated here to preserve the project’s processing history and study context.
Silver Sand Project — Technical Report
Silver Sand Project — Technical Report
| Commodities | Silver |
| Throughput | 12,000 tpd |
| Status | Development (PFS) |
Executive Summary
This section outlines the selected mineral processing flowsheet for the Silver Sand project based on recent metallurgical testwork programs. The metallurgical team evaluated several processing options, including heap leaching, froth flotation, and agitated tank cyanidation. Trade-off studies comparing capital cost, operating cost, and metallurgical efficiency confirmed that an agitated tank cyanidation process is the preferred method for the Preliminary Feasibility Study (PFS).
The selected flowsheet is a low-risk approach to silver extraction involving ROM receiving, crushing, and stockpiling. The ore is then ground using a conventional SAG mill and ball mill configuration, with pebble crushing utilizing a cone crusher. The milled slurry undergoes pre-leach thickening followed by cyanide leaching in agitated, oxygen and air sparged tanks. Silver is recovered from the pregnant leach solution via zinc precipitation, followed by drying and smelting to produce silver doré bars. The processing rate is designed to match the mine production rate of 12,000 tpd.
Website: https://www.newpacificmetals.com/projects/silver-sand-project/
Report Date:
Region:
Project Status: Development (PFS)
Commodity: Silver
Throughput: 12,000 tpd
Mine Life:
Mine Type:
Ore type:
