Paramount Gold Announces New Positive Metallurgical Results from Its San Miguel Project in Mexico
April 27 2011 - 8:00AM
Marketwired
Paramount Gold and Silver Corp. (NYSE Amex: PZG)(TSX:
PZG)(FRANKFURT: P6G)(WKN: A0HGKQ) ("Paramount") announced today 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.
------------------------------------------------------------------------
Summary results, Agitated Cyanidation test (Bottle Roll)
------------------------------------------------------------------------
Composite
ID(i) Au g/t Ag g/t Recovery% Reagent consumption
------------------------------------------------------------------------
Head Head Lime Kg/mt
Grade Grade Au Ag NaCN kg/mt ore ore
------------------------------------------------------------------------
SF-09-01 1.475 25.09 90.3 84.1 0.15 1.4
------------------------------------------------------------------------
SF-09-02 0.936 9.29 93.8 89.2 less than 0.05 1.3
------------------------------------------------------------------------
RCSF-10-001 0.848 13.51 90.7 87.6 0.15 1.6
------------------------------------------------------------------------
RCSF-10-002 0.474 4.16 85.0 76.0 0.08 1.1
------------------------------------------------------------------------
RCSF-10-004 0.924 5.00 90.4 60.0 0.07 1.5
------------------------------------------------------------------------
RCSF-10-005 2.086 52.15 94.4 75.1 0.13 1.5
------------------------------------------------------------------------
RCSF-10-006 0.808 8.77 87.1 65.8 0.07 1.5
------------------------------------------------------------------------
RCSF-10-007 1.276 24.90 93.5 73.2 0.08 1.3
------------------------------------------------------------------------
RCSF-10-008 1.611 9.67 95.9 75.9 0.07 1.4
------------------------------------------------------------------------
Hi Au 3.233 40.80 95.9 77.9 0.30 1.0
------------------------------------------------------------------------
Hi Ag, Low Au 0.162 35.20 83.3 76.4 0.23 1.3
------------------------------------------------------------------------
Average 1.258 20.78 90.9 76.5 0.13 1.35
------------------------------------------------------------------------
(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
Safe Harbor for Forward-Looking Statements:
This release and related documents may include "forward-looking
statements" including, but not limited to, statements related to
the interpretation of drilling results and potential
mineralization, future exploration work at the San Miguel Project
and the expected results of this work. Forward-looking statements
are statements that are not historical fact and are subject to a
variety of risks and uncertainties which could cause actual events
to differ materially from those reflected in the forward-looking
statements including fluctuations in the price of gold, inability
to complete drill programs on time and on budget, and future
financing ability. Paramount's future expectations, beliefs, goals,
plans or prospects constitute forward-looking statements within the
meaning of the United States Private Securities Litigation Reform
Act of 1995 and other applicable securities laws. Words such as
"believes," "plans," "anticipates," "expects," "estimates" and
similar expressions should also be considered to be forward-looking
statements. There are a number of important factors that could
cause actual results or events to differ materially from those
indicated by such forward-looking statements, including, but not
limited to: uncertainties involving interpretation of drilling
results, environmental matters, lack of ability to obtain required
permitting, equipment breakdown or disruptions, and the other
factors described in Paramount's Annual Report on Form 10-K for the
year ended June 30, 2010 and its most recent quarterly reports
filed with the SEC.
Except as required by applicable law, Paramount disclaims any
intention or obligation to update any forward-looking statements as
a result of developments occurring after the date of this
document.
Contacts: Paramount Gold and Silver Corp. Glen Van Treek VP
Exploration 866-481-2233 Paramount Gold and Silver Corp. Chris
Theodossiou Investor Relations 866-481-2233
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