Results demonstrate strong recoveries of silver and gold from the Murray and
Key Highlights
Outstanding Silver and Gold Recoveries: Representative composite vein samples from the Murray and the
High-Grade Concentrate Produced: Both composite samples produced high-grade concentrates with grades of 6,954 g/t silver and 58.5 g/t gold from
Conventional Milling Expected: The demonstrated recoveries were produced from a sample grind size of 80% of particles passing 75 microns or smaller which is typical in conventional milling processes.
Importance of Gravity Separation: The test work also showed that prior to flotation, gravity separation improved recoveries for silver and gold significantly at both Murray and
Drilling at the Ruby Discovery Continues: A 650 m step-out from the recent new vein discovery at Ruby is in progress testing a large and undrilled geophysical anomaly.
Metallurgical Test Work Program Summary
A Scoping-level metallurgical test program was designed by
Two representative composite samples of mineralized, epithermal-related vein material were selected from drill holes at the Murray and
The composite samples responded well to cyanide leaching tests. Whole ore leach tests yielded silver recoveries of 86.1% and 56.8% and gold recoveries of 90.9% and 94.6%. Producing a gravity concentrate prior to leaching increased the silver recoveries to 88.9% and 86.3% and gold recoveries to 91.9% and 94.6%. Recoveries for silver and gold were optimised in HC-1 by adding a rougher flotation circuit after concentrating the sample by gravity. Leaching of this product from HC-1 yielded a silver recovery of 96.7% and a gold recovery of 95.9%. Leaching of the rougher flotation concentrate increased the recovery of gold to 97.1% in HC-2, however, the silver recovery did not improve.
Flotation and leaching of the gravity concentrates have strong implications for maximum recoveries of silver and gold from the Murray vein and for gold from the Rescue veins of the
Methods
At
Head assay analyses were conducted via ICP-OES (inductively coupled plasma optical emission spectroscopy) following an aqua regia digest.
Gravity testing was conducted by centrifugal Gold Concentration using a Knelson MD-3 concentrator followed by cleaning on a Mozley C-800 Table. The gravity concentrate was assayed for gold to extinction and the tailings from the Knelson and Mozley table were retained for cyanide leaching.
Samples underwent rougher flotation collecting on four timed concentrates to determine kinetic recover rates for Ag, Au and S. The concentrates were reconstituted and leached in sodium cyanide along with the rougher tailings for precious metal recovery.
Leaching tests were performed directly on whole ore samples as well as samples from gravity concentrates and rougher flotation tailings and rougher flotation concentrates. Tests were completed in bottles on rolls which included 4 kinetic solutions measured after 4, 6, 24 and 48 hours of leaching. Products from the tests were assayed for gold and silver.
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About
Contact:
Giordy Belfiore
Tel: 604-288-8004
Email: giordy@summasilver.com
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