Source: Paramount Gold and Silver Corp.
Paramount Gold and Silver Corp. (AMEX:PZG - News)(TSX:PZG - News)(Frankfurt:P6G - News)(WKN: A0HGKQ) ("Paramount") announces new positive metallurgical results for its 100% owned San Miguel project in Mexico. The new study, conducted by McClelland Laboratories Inc., is based on eleven composite samples from 256 drill hole intercepts in the San Francisco Area of the San Miguel project. Direct agitated cyanidation tests (bottle roll) returned average recoveries of 90.1% for gold and 76.5% for silver, with low cyanide and lime consumption.
In 2010 Paramount Gold and Silver prepared a number of samples from an ongoing drilling campaign to test metallurgical recoveries on various ore types. A total of eleven composite samples of various gold and silver grades were prepared from 256 drill holes intercepts. Composites were prepared by crushing to P8075um (80% passing 75 microns). Bottle roll and flotation tests were conducted on all composites to evaluate likely recovery scenarios.
Bottle roll tests returned the best recoveries and proved to be the most cost efficient, with gold recoveries ranged from 83.3% to 95.9% and silver recoveries from 60.0 % to 89.2%. Metal recovery was very rapid through the first six hours and slower thereafter. Tests were terminated after 48 hours of leaching. Reagent consumption was low, with average sodium cyanide (NaCN) consumption of 0.13 kg per tonne of material and lime consumption of 1.35 kg per tonne of material processed.
Sulfide flotation tests on the same materials showed much lower recoveries, demonstrating that direct cyanide leaching is a more efficient and cost effective recovery process for both gold and silver.
Details of results are tabulated below and full McClelland Report can viewed at www.paramountgold.com.
Christopher Crupi, CEO Paramount Gold and Silver commented: "These results are an important step towards demonstrating the economics of the San Francisco target. Having these results now should also help us to define a larger resource. Knowing that recoveries are likely to be high even on lower grade material will encourage us to lower the cut-off grade and expand the mineralized envelope that we drill and include in our resource model".
Paramount Gold and Silver continues its drilling program at San Miguel to improve the resource quality and to update resources on several of the zones. Paramount Gold also continues to test other unexplored targets within its large property position at San Miguel Project.
Bill Threlkeld, a Qualified Person under NI43-101 has reviewed the contents of this release. For more information visit www.paramountgold.com
In 2010 Paramount Gold and Silver prepared a number of samples from an ongoing drilling campaign to test metallurgical recoveries on various ore types. A total of eleven composite samples of various gold and silver grades were prepared from 256 drill holes intercepts. Composites were prepared by crushing to P8075um (80% passing 75 microns). Bottle roll and flotation tests were conducted on all composites to evaluate likely recovery scenarios.
Bottle roll tests returned the best recoveries and proved to be the most cost efficient, with gold recoveries ranged from 83.3% to 95.9% and silver recoveries from 60.0 % to 89.2%. Metal recovery was very rapid through the first six hours and slower thereafter. Tests were terminated after 48 hours of leaching. Reagent consumption was low, with average sodium cyanide (NaCN) consumption of 0.13 kg per tonne of material and lime consumption of 1.35 kg per tonne of material processed.
Sulfide flotation tests on the same materials showed much lower recoveries, demonstrating that direct cyanide leaching is a more efficient and cost effective recovery process for both gold and silver.
Details of results are tabulated below and full McClelland Report can viewed at www.paramountgold.com.
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Summary results, Agitated Cyanidation test (Bottle Roll)
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Composite
ID(i) Au g/t Ag g/t Recovery% Reagent consumption
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Head Head Lime Kg/mt
Grade Grade Au Ag NaCN kg/mt ore ore
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SF-09-01 1.475 25.09 90.3 84.1 0.15 1.4
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SF-09-02 0.936 9.29 93.8 89.2 less than 0.05 1.3
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RCSF-10-001 0.848 13.51 90.7 87.6 0.15 1.6
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RCSF-10-002 0.474 4.16 85.0 76.0 0.08 1.1
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RCSF-10-004 0.924 5.00 90.4 60.0 0.07 1.5
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RCSF-10-005 2.086 52.15 94.4 75.1 0.13 1.5
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RCSF-10-006 0.808 8.77 87.1 65.8 0.07 1.5
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RCSF-10-007 1.276 24.90 93.5 73.2 0.08 1.3
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RCSF-10-008 1.611 9.67 95.9 75.9 0.07 1.4
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Hi Au 3.233 40.80 95.9 77.9 0.30 1.0
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Hi Ag, Low Au 0.162 35.20 83.3 76.4 0.23 1.3
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Average 1.258 20.78 90.9 76.5 0.13 1.35
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(i) All composite samples, except RCSF-10-007 are sulfide bearing ore.
These results indicate that even at low gold and silver grades, recoveries of sulfide bearing material are excellent with low reagent consumptions.Christopher Crupi, CEO Paramount Gold and Silver commented: "These results are an important step towards demonstrating the economics of the San Francisco target. Having these results now should also help us to define a larger resource. Knowing that recoveries are likely to be high even on lower grade material will encourage us to lower the cut-off grade and expand the mineralized envelope that we drill and include in our resource model".
Paramount Gold and Silver continues its drilling program at San Miguel to improve the resource quality and to update resources on several of the zones. Paramount Gold also continues to test other unexplored targets within its large property position at San Miguel Project.
Bill Threlkeld, a Qualified Person under NI43-101 has reviewed the contents of this release. For more information visit www.paramountgold.com
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