Bullfrog Gold Achieves High Leach Recoveries at its Nevada Project
23 Oktober 2019 - 12:00PM
via NEWMEDIAWIRE --
Bullfrog Gold
Corp (OTCQB:BFGC and CSE:BFG) (“Bullfrog”, “BFGC” or
the “Company”) is pleased to announce high gold recoveries from
column leach tests on bulk samples collected from its Bullfrog
Project (“Project”) located 125 miles NW of Las Vegas, Nevada.
Metallurgical Testing
During the past 20 months the Company collected
four bulk samples from the Bullfrog (BF), Mystery Hill (MH) and
Montgomery-Shoshone (MS) pit areas and engaged McClelland
Laboratories of Reno, Nevada to complete eleven column and bottle
roll leach test on 3/8-inch and finer sizes. The BF 2019
column tests were performed on sample splits that typify most of
the 43-101 measured and indicated gold resources on the Project,
whereas the BF 2018, MS 2019 and MH 2019 samples represent the
smaller balance of remaining resources. Final column leach results
are summarized below.
Column Leach Test Summaries |
Deposit |
Test Year |
Leach Days |
Leach Size, p80 |
Crush Type |
Calc. Head, g/t |
Avg. Head Assay, g/t |
Gold Rec., % |
|
|
|
Inch 1 mm |
|
|
|
|
BF |
2018 |
84 |
3/8
9.5 |
Conv. |
0.79 |
0.89 |
58.2 |
|
|
84 |
1/16 1.7 |
HPGR |
0.84 |
0.89 |
77.4 |
|
|
|
|
|
|
|
+19.2 |
BF |
2019 |
151 |
3/8 9.5 |
Conv. |
1.54 |
1.71 |
75.3 |
|
|
122 |
1/4
6.3 |
HPGR |
1.66 |
1.71 |
77.1 |
|
|
102 |
1/16 1.7 |
HPGR |
1.60 |
1.71 |
89.4 |
|
|
|
|
|
|
|
+14.1 |
MS |
2019 |
108 |
3/8 9.5 |
Conv. |
0.79 |
0.86 |
65.8 |
|
|
108 |
1/4
6.3 |
HPGR |
0.82 |
0.86 |
76.8 |
|
|
89 |
1/16 1.7 |
HPGR 2 |
0.88 |
0.86 |
85.2 |
|
|
|
|
|
|
|
+19.4 |
MH |
2019 |
109 |
3/8 9.5 |
Conv. |
0.36 |
0.34 |
83.3 |
|
|
105 |
1/4
6.3 |
HPGR |
0.33 |
0.34 |
87.9 |
|
|
86 |
1/16 1.7 |
HPGR 2, 3 |
0.34 |
0.34 |
91.2 |
1 1/16-inch is approximately 10 mesh 2
Agglomerated with 2 kg cement/mt |
+7.9 |
3 The MH material needs more than 2 kg cement/t to create
durable agglomerates |
|
The -3/8-inch samples were sized using
conventional crushers (“Conv.”) and the -1/4 and -1/16-inch samples
were further reduced using high pressure grinding rolls (“HPGR”),
which can produce finer sizes with much more microfractures that
increase gold and silver recoveries. The Bullfrog deposit is highly
amenable to leaching exceptionally fine sizes from HPGR’s as the
host rocks contain much lower low clay contents than most other
gold deposits and do not generate much additional fines during the
size reduction processes.
The four column tests sized at -1/16 inch recovered 86% of the
gold compared to 71% from the tests at -3/8-inch, or an average 15%
increase. The MH 2019 sample at an average grade of only 0.34 g
gold/t notably recovered 83% at -3/8-inch Conv. and 91% at
-1/16-inch HPGR. The minus 1/16-inch samples in the MS and MH
columns each weighed 33.4 kg whereas the nine other column samples
each weighed near 71 kg.
Bottle roll tests are not reported herein as they are typically
performed on samples of only 1 kg and their indicative results are
not as accurate or representative as the larger column tests that
closely simulate heap leach production operations.
Nonetheless, bottle roll tests are useful for scoping heap
leach characteristics and are part of our metallurgical data
base.
Load-permeability tests on the MS leached residues indicate that
the fine -1/16-inch size can be stacked up to 200 feet high subject
to agglomerating with 2 kg of cement/ton. Observation of the two
leach tests on the -1/16-inch BF samples suggest that cement
agglomeration should be applied. As the agglomerates in the
-1/16-inch MH sample degraded by the end of the leach test, a
higher cement content is needed for this material. At this time, it
appears that the fine size of -1/8-inch may provide the best
overall performance. In this regard, the test results performed at
-1/16 and -1/4-inch can be interpolated at -1/8-inch with
confidence. The 1/8-inch size also allows higher heap heights with
less risk of encountering percolation or stability issues than a
finer size. In summary, all reagent consumptions were
relatively low, and agglomeration does not appear necessary for
sizes greater than 1/4-inch.
For reference, column leach tests completed in 1994 by Kappes
Cassiday Labs achieved a gold recovery of nearly 76% on 40 kg of
representative BF stockwork mineralization averaging 0.99 g/t that
was conventionally crushed to -3/8” and leached for 41 days.
An 800-ton pilot heap leach test performed by Barrick Bullfrog Inc.
in 1995 recovered 67% on similar mineralization averaging 0.65 g/t
and conventionally crushed to -1/2”; however, this test would
likely have recovered near 76% of the gold had the heap been
crushed to -3/8”, leached longer than 41 days and if reported
solution distribution issues did not occur.
About Bullfrog Gold Corp.
BFGC is a Delaware corporation that controls the
commanding land and mineral positions in the Bullfrog Mine area
where Barrick Bullfrog Inc. produced 2.3 million ounces of gold by
conventional milling from 1989 into 1999. An independent Canadian
National Instrument 43-101 compliant report prepared in August 2017
estimated mineralization at 624,000 ounces at 0.7 g/tonne gold
within expanded pit plans based on a gold price of $1,200 and use
of heap leaching. The Company obtained a large data base from
Barrick, including detailed information on 155 miles of drilling in
the area, and has defined BF and MS pit expansions and several
prospective exploration targets.
Cautionary Note Regarding Forward Looking
Statements
This press release contains certain
"Forward-Looking Statements" within the meaning of Section 27A of
the Securities Act of 1933, as amended, and Section 21E of the
United States Securities Exchange Act of 1934, as amended. All
statements, other than statements of historical fact, included
herein including those with respect to the objectives, plans and
strategies of the Company and those preceded by or that include the
words "believes," "expects," "given," "targets," "intends,"
"anticipates," "plans," "projects," "forecasts" or similar
expressions, are forward-looking statements that involve
various risks and uncertainties. Forward looking information in
this press release includes but is not limited to statements
regarding increased liquidity for the Company’s shareholders and
the application of metallurgical testing results.
Such forward-looking information and statements are based on
numerous assumptions, including among others, the Company's ability
to successfully maintain its listings, the stability of industry
and market costs and trends and the Company's ability to obtain all
regulatory approvals required for its planned objectives.
Furthermore, by their very nature, forward-looking information
involves a variety of known and unknown risks, uncertainties and
other factors which may cause the actual plans, intentions, events,
results, performance or achievements of the Company to be
materially different from those expressed or implied by such
forward-looking information. Such risks, uncertainties and other
factors include, without limitation, those related to: (a) adverse
regulatory or legislative changes (b) market conditions, volatility
and global economic conditions (c) industry-wide risks (d) the
Company's inability to maintain or improve its competitive position
and (e) the ability to obtain financing needed to fund the
continued development of the Company's business.
We use certain terms in this valuation such as “mineralization”
and “mineral inventory estimates” that are not defined in Canadian
National Instrument 43-101; or recognized under the U.S. SEC
Industry Guide 7. The Company is presently an exploration stage
company. Exploration is highly speculative in nature,
involves many risks, requires substantial expenditures and may not
result in the discovery of mineral deposits that can be mined
profitably. Furthermore, the Company currently has no
resources or reserves on any of its properties. As a result,
there can be no assurance that such forward-looking statements will
prove to be accurate, and actual results and future events could
differ materially from those anticipated in such statements.
Additional information regarding important factors that could cause
actual results to differ materially from the Company's expectations
is disclosed in the Company's documents filed from time to time
with the United States Securities & Exchange Commission.
Investors are urged to consider closely the disclosures in our Form
10-K and other SEC filings, which can be obtained from the SEC’s
website at http:www.sec.gov/edgar.shtml, or sourced
through www.bullfroggold.com.
Qualified Person
David Beling, P.E. has 55 years of project and
corporate experience in the mining industry and is a qualified
person as defined by Canadian National Instrument 43-101 –
Standards of Disclosure or Mineral Projects. Mr. Beling has
prepared, supervised the preparation of, or approved the technical
information that forms the basis of the Company’s disclosures, but
is not independent of Bullfrog Gold Corp, as he is the CEO &
President and holds common shares and incentive stock options of
the Company.
For further information, please contact David Beling, CEO &
President, at (970) 628-1670.
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