Arizona Gold & Silver Achieves +90% Gold Extraction by Agitation Leach And 61%-73% Extraction by Column Leaching at The Philadelphia Gold-Silver Project, Arizona
NEWS RELEASE
Arizona Gold & Silver Achieves +90% Gold Extraction by Agitation Leach And 61%-73%
Extraction by Column Leaching at The Philadelphia Gold-Silver Project, Arizona
Vancouver, British Columbia, October 23, 2024 – Arizona Gold & Silver Inc. (TSXV: AZS)
(OTCQB:AZASF) is pleased to announce it has received the final metallurgy report from McClelland
Laboratories on agitation and column leach test work performed on two bulk samples from the Philadelphia
gold-silver property. The samples were entirely of oxidized material taken from underground and surface
workings. The objective of the program was to demonstrate the amenability of 1-2 grams per tonne gold
material for heap leaching, the most cost-effective method for recovering precious metals from bulk tonnage
gold deposits of this type.
Column leach tests are the standard laboratory method for determining the amenability of oxide gold and silver
bearing material to heap leach methods. The program established on a preliminary basis the optimum crush
and recovery characteristics of the 1-2 grams per tonne gold material tested. Agitation leaching at various
grind sizes was performed to assess gold and silver extractions for milling purposes . The column test work
was completed at several crush sizes to assess gold and silver extractions under simulated heap leach
conditions.
Greg Hahn, Vice President of Exploration, commented “We have yet to see sulphides in old workings or in
our drilling at Philadelphia. That being the case, we are very pleased with the results of test work on what I
see as potentially large volumes of oxide material. The program demonstrated excellent gold extractions and
modest silver extractions (as expected). Importantly, t he column leach work demonstrates that our metal
extractions at Philadelphia are in line with other heap leach operations in the region. The columns were still
leaching gold at the end of the 177-day test period. Projections out to 360 days indicate additional extractions
to 70% to 80% could be achieved, as during a commercial heap leach operation. The trade-off between higher
capital and operating costs in a milling operation versus lower capital and operating costs for heap leaching
would be the subject for an economic trade-off study down the road”.
Previous metallurgical test work completed by the Company in 2020 on the north end of the property
demonstrated the amenability of both low and high grades material to cyanide leaching . That test work
achieved 89-99% gold extraction under agitation leach conditions at -104 micron grind. Silver recovery was
not addressed in those tests.
The Company submitted 429 kilograms of oxidized bulk material from two sample sites for testing at
McClelland Laboratories Inc. in Sparks, Nevada. These sample s represent the two dominant metallurgical
types present on the property: stockwork quartz in dominantly TR2 rhyolite and stockwork quartz in
dominantly granite. The test work consisted of three columns from each bulk sample at crush sizes of -1/4 inch
(6.3mm), -3/8 inch (9.5mm) and -1/2 inch (12.5mm) particle size. Bottle roll leach tests were also done on -10
mesh material. Tails analyses w ere included to assess ultimate gold and silver extractions and reagent
consumption. Load permeability tests after completion of the leach cycle assess potential heap heights under
each crush size scenario.
Agitation leach tests indicated both bulk samples are readily amenable to agitation cyanidation at all grind
sizes. Gold extractions of +90% were achieved from both samples at a grind size of -425 microns or finer.
The report concludes that the Philadelphia deposit is very amenable to agitation cyanidation with excellent
gold extractions and low reagent consumption. Silver extractions were significantly lower, being in the range
of 10-55%, depending upon sample and grind size.
Column leach tests indicated both bulk samples were readily amenable to simulated heap leach at all three
crush sizes tested. Extractions improve with finer crush sizes, indicating the -1/4” inch size generated the best
extractions over the 177-day leach period of 60. 6% to 72.7% for the two samples. Gold was still leaching at
the end of the 177 -day test period, and the curves suggest gold extractions will improve over a longer leach
cycle. Silver extractions were also lower than in agitation leach tests. R egression analysis of the leach curves
suggests extraction should reach 70 -80% if leaching is extended out to 360 days. Also, due to the silicious
nature of the bulk sample material and the lack of significant fines, it is suggested that further test work be
performed using HPGR (high pressure grinding rolls) crushing which generates more fine material than
conventional crushing and is known to enhance both total extraction and the rate of extraction, and is currently
in use at some heap leach operations in the region.
Additional column test work and agitation leach test work is planned on dedicated drill core samples and coarse
rejects of reverse circulation (“RC”) cuttings from both the high -grade veins and the stockwork mineralized
zones throughout the deposit. This will characterize the leach characteristics and kinetics along the entire strike
length of the deposit.
Qualified Person
Gregory Hahn, VP -Exploration and a Certified Professional Geologist (#7122) is a Qualified Person under
National Instrument 43-101 ("NI 43-101") and has reviewed and approved the technical information contained
in this news release.
Retirement of Board Member
Arizona Gold & Silver Inc. reports today that Mr. Eugene Spiering, a member of the Board of Directors since
November 27, 2018 and with 45 years in the industry, has decided to retire. The Company respects his decision
and would like to thank Gene for his dedicated service with Arizona Gold & Silver Inc. and the valuable
knowledge and experience he contributed during his tenure. B oard members would like to extend our
congratulations to Gene, and we hope his retirement is full of enjoyment and adventurous times ahead.
About Arizona Gold & Silver Inc.
Arizona Gold & Silver Inc. is a leading exploration company focused on uncovering precious metal resources
in Arizona and Nevada. With a commitment to sustainable practices and innovative exploration techniques,
the company aims to drive value for stakehol ders while prioritizing environmental stewardship. The flagship
asset is the Philadelphia gold -silver property where the Company is drilling off an epithermal gold -silver
system ahead of an initial resource calculation.
On behalf of the Board of Directors:
ARIZONA GOLD & SILVER INC.
Mike Stark, President and CEO, Director
Phone: (604) 833-4278
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies
of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
CAUTION CONCERNING FORWARD-LOOKING STATEMENTS
This news release includes certain forward -looking statements or information. All statements other than statements of
historical fact included in this release are forward -looking statements that involve various risks and uncertainties.
Forward-looking statements in this news release include statements in relation to the timing, cost and other aspects of the
2024 exploration program; the potential for development of the mineral resources; the potential mineralization and
geological merits of the exploration properties; and other future plans, objectives or expectations of the Company. There
can be no assurance that such statements will prove to be accurate and actual results and future events could differ
materially from those anticipated in such statements. Important factors that could cause actual results to differ materially
from the Company's plans or expectations include the risk that actual results of current and planned exploration activities,
including the results of the Company's 2024 drilling program (s) on its properties, will not be consistent with the
Company's expectations; the geology, grade and continuity of any mineral deposits and the risk of unexpected variations
in mineral resources, grade and/or recovery rates; fluctuating metals prices; pos sibility of accidents, equipment
breakdowns and delays during exploration; exploration cost overruns or unanticipated costs and expenses; uncertainties
involved in the interpretation of drilling results and geological tests; availability of capital and fin ancing required to
continue the Company's future exploration programs and preparation of geological reports and studies; delays in the
preparation of geological reports and studies; the metallurgical characteristics of mineralization contained within the
exploration properties are yet to be fully determined; general economic, market or business conditions; competition and
loss of key employees; regulatory changes and restrictions including in relation to required permits for exploration
activities (including drilling permits) and environmental liability; timeliness of government or regulatory approvals; and
other risks detailed herein and from time to time in the filings made by the Company with securities regulators. In
connection with the forward -looking i nformation contained in this news release, the Company has made numerous
assumptions, including that the Company's 2024 programs would proceed as planned and within budget. The Company
expressly disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of
new information, future events or otherwise, except as otherwise required by applicable securities legislation.