Results demonstrate strong recoveries of silver and gold from the Consolidated target.
Key Highlights
Outstanding Silver and Gold Recoveries: Two representative composite samples from the Queen Vein featured recoveries ranging from 96.2% to 97.9% for silver and 97.7% to 97.8% for gold from flotation concentrates.
High-Grade Concentrate Produced: Both composite samples produced a high-grade concentrate with grades that averaged 2,122 g/t silver and 77 g/t gold.
Conventional Milling Potential: 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.
Next Steps: With multiple targets planned for drilling, the Company will initiate continued metallurgical test work as more zones are drilled.
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 that intersected the Queen Vein, central to the Consolidated Extension Target. MOG-1 was a 32 m composite sample from hole MOG22-05 drilled north of the Consolidated mine stopes and MOG-2 was a 20 m composite sample from hole MOG22-04 drilled south of the Consolidated mine stopes. Samples were analysed for head assay grades which returned 208 g/t Ag with 7.48 g/t Au (MOG-1) and 261 g/t Ag with 4.0 g/t Au (MOG-2).
The composite samples responded well to cyanide leaching tests. Whole ore leach tests yielded silver recoveries of 67.4% and 64.2% and gold recoveries of 86.9% and 82.7%. Producing a gravity concentrate prior to leaching increased the silver recoveries to 73.7% and 73.8% and gold recoveries to 90.6% and 90.3%. Recoveries for silver and gold were optimised by adding a rougher flotation circuit after concentrating the sample by gravity. Leaching of this product yielded silver recoveries of 96.2% and 97.9% and gold recoveries of 97.8% and 97.7%.
Flotation and leaching of the gravity concentrates have strong implications for maximum recoveries of silver and gold from the Queen Vein. Future work will also focus on investigating grind sensitivities on silver and gold recoveries. As additional targets and veins are drilled by
Methods
At
The gravity concentrate was assayed for gold to extinction and the tailings from the Knelson and Mozley table were retained for cyanide leaching.
Rougher flotation tests yielded four rougher concentrates and a final rougher for assay of gold, silver and sulphur. Products from flotation were retained for leaching.
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 four kinetic solutions measured after 4, 6, 24 and 48 hours of leaching. Products from the tests were assayed for gold and silver.
About
The Hughes property includes the high-grade past-producing
Contact:
Tel: 604-288-8004
Email: giordy@summasilver.com
Cautionary note regarding forward-looking statements
This news release contains certain 'forward looking statements' and certain 'forward-looking information' as defined under applicable Canadian and
Forward-looking information is subject to known and unknown risks, uncertainties and other factors that may cause the actual actions, events or results to be materially different from those expressed or implied by such forward-looking information, including but not limited to: the requirement for regulatory approvals; enhanced uncertainty in global financial markets as a result of the current COVID-19 pandemic; unquantifiable risks related to government actions and interventions; stock market volatility; regulatory restrictions and other related risks and uncertainties.
Forward-looking information are based on management of the parties' reasonable assumptions, estimates, expectations, analyses and opinions, which are based on such management's experience and perception of trends, current conditions and expected developments, and other factors that management believes are relevant and reasonable in the circumstances, but which may prove to be incorrect.
The Company undertakes no obligation to update forward-looking information except as required by applicable law. Such forward-looking information represents management's best judgment based on information currently available. No forward-looking statement can be guaranteed and actual future results may vary materially. Accordingly, readers are advised not to place undue reliance on forward-looking statements or information.
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