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Patriot Gold Announces Initial Metallurgy Results for Moss Mine Project, Arizona
May 26, 2009
Patriot Gold
Corp. (OTCBB: PGOL) today announced the results of initial metallurgy conducted
on core samples from its Moss Mine Project located approximately 70 miles
southeast of Las Vegas, Nevada. The program was conducted to test the
potential for heap leaching the gold/silver mineralization at Moss, a less
expensive recovery system than conventional milling. The tests were conducted
by METCON Research of Tucson, Arizona.
Prior to
conducting a column leach study, an agitated cyanide leach study (bottle roll) was
conducted on four samples at minus 10 mesh and 150 mesh (pulverized) crush
sizes to compare oxide to sulfide recoveries and determine reagent consumption.
The Moss Mine deposit contains minor pyrite below a depth of approximately 200 feet.
The results of the 96 hour test, shown below, indicate similar extraction
percentages for sulfide and oxide. This indicates that even the deeper,
un-oxidized mineralization at Moss may be leachable. Reagent consumption was
minimal.
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Moss Mine Project Preliminary
Bottle Roll Cyanide Leach Tests – Oxide and Sulfide Composite Samples
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Test No.
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Sample ID
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Crush Size
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Calculated Head
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Cumulative Extraction
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Au (g/t)
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Ag (g/t)
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Au (%)
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Ag (%)
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BR-01
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Oxide
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10 mesh
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1.24
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16.6
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63.87
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37.37
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BR-02
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Oxide
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150 mesh
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1.36
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16.4
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97.07
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79.43
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BR-03
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Sulfide
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10 mesh
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0.82
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15.8
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67.22
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56.46
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BR-04
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Sulfide
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150 mesh
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0.89
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17.6
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92.2
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83.06
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The locked cycle column leach tests were conducted on
the Moss core at 80 percent passing 1 inch, 1/2 inch and 1/4 inch crush sizes.
Three test charges were reconstituted and loaded into 4 inch diameter PVC
columns to a height of approximately 3.5 meters. Prior to loading the columns,
the sample was agglomerated with water and lime. The columns were leached for
109 days.
Gold extraction ranged from 39 to 66 percent and
silver extraction ranged from 14 to 42 percent depending on crush size as shown
in the table below. Reagent consumption was again minimal.
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MOSS MINE PROJECT- Oxide
Composite Sample
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Crush Size Locked Cycle Column
Leach Study
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Summary of Results
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Sample ID
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Test No.
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Crush Size
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Calculated Head (g/t)
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Cumulative
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Extraction (%)
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Extraction (g/t)
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Au
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Ag
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Au
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Ag
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Au
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Ag
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Oxide 1
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CL-01
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P80 1 inch
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1.44
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13.68
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38.66
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14.12
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0.56
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1.93
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CL-02
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P80 1/2 inch
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1.21
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14.75
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51.95
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24.16
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0.63
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3.56
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CL-03
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P80 1/4 inch
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1.30
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13.54
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66.31
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42.11
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0.86
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5.70
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Column leach results indicate
the Moss mineralization is leachable. At the end of the 109 day test all three
samples were still contributing gold/silver to the leach solution. This
indicates longer leach times will improve recoveries. A graph of gold/silver
recoveries is on the company’s website.
At Round Mountain, Nevada and
several other heap leach operations in Nevada leaching is conducted for several
years on the same leach pile. The success of this initial metallurgy indicates
the Moss Mine deposit may be minable at a lower cut-off grade thus allowing
mining to greater depth. Patriot plans an additional drilling program to expand
the resource down-dip, a resource calculation and further metallurgy using
longer column leach times.
Disclaimer:
This announcement may contain forward-looking statements which involve risks
and uncertainties that include, among others, limited operating history,
limited access to operating capital, factors detailed in the accuracy of
geological and geophysical results including drilling and assay reports; the
ability to close the acquisition of mineral exploration properties, and other
factors which may cause the actual results, performance or achievements of the company to be materially different from any future results, performance or
achievements expressed or implied by such forward-looking statements. More
information is included in the company's filings with the Securities and
Exchange Commission, and may be accessed through the SEC's web site at http://www.sec.gov.
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