The results were produced from the recent metallurgical testing program completed by
Highlights: Test work shows significantly increased gold recoveries from a flotation-regrind-leach process averaging: 93% recovery at Moss 98% recovery at
These results represent an 8% to 13% increase in gold recoveries from previously conducted standard leach test work.
Coarse bottle roll leach test results returned gold recoveries between 53% and 64%, which encourage investigation of a low recovery heap leach solution for low-grade mineralization that may bring gold production forward and reduce tailings.
President and CEO
The metallurgical gold recovery test-work was conducted to assess the potential gold recoveries and potential process flowsheets for the
Gold Recovery Test Work Results Summary
The program evaluated 18 discrete composite samples representing the two gold deposits. Each composite consisted of multiple samples collected from diamond drill core and coarse rejects. Primary composites were selected for the Main / QES Zones (three samples), and one sample each for the
Crushing and Grinding Testing
Comminution testing characterized sample hardness by Steve Morell Comminution ('SMC') testing,
The results showed: SMC Axb average value of 34.7, indicates the samples are competent.
Average RWI and BWI values of 18.4 and 19.5 (metric) respectively, considered hard to very hard range of hardness.
Average Ai value of 0.175 g, which is classified as low to moderately abrasive.
Gravity Concentration Testing
The results showed: Moderate Gravity Recoverable Gold content totaling 40% gold.
At full scale, this would be in the 10% to 15% gold recovery range.
Leach Testing
Coarse Particle Size Leach Tests
Intermittent bottle rolls leach tests were conducted on the samples at crush sizes of -6.25 mm and -2 mm to evaluate potential for heap leaching. Tests were run over 8 days with bottles rolled for 1 minute per hour.
The results showed:
Average leach extraction for the -6.25 mm crush size samples is 52.6% Au.
Average leach extraction for the -2 mm crush size samples is 64.2% Au.
Standard Leach Tests
Initial standard bottle rolls leach tests were completed on the primary composites from Main and QES Zones, over a range of grind sizes with 48 hours leaching and without gravity concentration prior to leaching. The results showed a weak relationship between grind size and recovery. As a result, a grind of 80% passing 100 microns was selected for further testing. The selected retention time was 48 hours. Gold leach extractions averaged 84% for these tests.
A total of 25 leach tests were conducted including initial screening tests and a bulk leach test (pending) that will generate sample for cyanide detox testing. The results showed:
Gold leach extractions ranging from 74% to 93%, averaging 83%, with final residue values of 0.08 g/t to 0.32 g/t gold, averaging 0.20 g/t gold.
Calculated gold head grades ranging from 0.40 g/t to 3.06 g/t gold, averaging 1.36 g/t gold.
Sodium cyanide consumption averaged 0.50 kg/t.
Flotation-Leach Tests
Testing was also completed using a flotation-leach flowsheet which includes:
Grinding to 80% passing 100 microns.
Flotation of a sulphide concentrate.
Concentrate regrind to 80% passing 15 microns followed by 48 hours leaching.
Flotation tailings leach without regrinding for 48 hours.
Results were positive with higher extractions than the standard leach tests. Key results include:
Sulphide concentrate mass recoveries averaged 11%, ranging from 5% to 19%.
Concentrate leach extractions averaged 96%, ranging from 92% to 98%.
Flotation tailings leach extractions averaged 76%, ranging from 69% to 90%.
Combined leach extractions averaged 93%, ranging from 87% to 98%.
Calculated gold head grades ranging from 0.60 g/t to 2.77 g/t gold, averaging 1.46 g/t gold.
Sodium cyanide consumption averaged 0.75 kg/t.
About Goldshore
Goldshore is an emerging junior gold development company, and owns 100% of the
About Ausenco
Ausenco is a global diversified engineering, construction and project management company providing consulting, project delivery and asset management solutions to the resources, energy and infrastructure sectors. Ausenco's experience in gold projects ranges from conceptual, pre-feasibility and feasibility studies for new project developments to project execution with EPCM and EPC delivery. Ausenco is currently engaged on a number of global projects with similar characteristics and opportunities to the
Contact:
Tel: +1 604 288 4416
Email: brichards@goldshoreresources.com
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