Liberty Gold Corp. (LGD-TSX; OTCQX: LGDTF) (“Liberty Gold” or the
“Company”) is pleased to report results from Phase 3 variability
composite metallurgical column testing from large-diameter (“PQ”)
drill core at its Black Pine Oxide Gold Project in southeastern
Idaho (“Black Pine”). The objective of the Phase 3
metallurgical program was to expand the geographical and ore type
distribution of Phase 1 and Phase 2 column testing which included
six surface bulk samples and 29 variability composites.
Highlights
- Phase 3 testing included 45 new variability composites testing
the full range of rock types, gold (“Au”) grades and ore types
encountered across Black Pine.
- Aggregate results support a simple, low capital, low
operating cost, Run-of-Mine (“ROM”) heap leach processing route for
Black Pine ores.
- Gold extractions are consistent with previous metallurgical
programs, with >80% of the leachable gold extracted within 10
days and final column leach gold extractions ranging up to
94.8%:
- Phase 1 bulk sample column test results: 78.9% weighted average
gold extraction, ranging up to 92.8%1
- Phase 2 variability composite column tests: 82.1% weighted
average gold extraction, ranging up to 94.5%1
- Historical column tests from bulk samples and drill core
composites: 80.8% weighted average gold extraction.
1 See press releases dated August 18, 2020 and June 16, 2020
Gary Simmons, independent consulting
metallurgist to Liberty Gold commented: “Data from
metallurgical testing to date at Black Pine continues to indicate
rapid leaching and relatively high gold extractions from these
gold oxide ores, with a consistent insensitivity to particle size
and a predictable grade-recovery relationship. In Phase 3 a wider
range of material types were tested and 38 of 39 tested composites
passed load permeability testing at 100-metre heap height. Internal
development of clay and rock models indicate that a smaller portion
of the resource may require in-pit or top-of heap blending,
eliminating the need for a Crush/Agglomeration flowsheet component,
and supporting simple Run-of-Mine leaching at Black Pine.”
All metallurgical work at Black Pine has been
supervised by Gary Simmons, formerly the Director of Metallurgy and
Technology for Newmont Mining Corp. Mr. Simmons has managed or
supervised a significant number of metallurgical testing programs
on similar Carlin-style sedimentary-hosted oxide gold deposits.
Jon Gilligan, Chief Operating Officer
for Liberty Gold said: “The consistent nature of the
metallurgical results to date at Black Pine is very encouraging and
points to a simple ROM operation. We are progressing the next
phases of test work to confirm gold recoveries at lower operating
cut-off grades and to expand our sampling coverage into the new
Rangefront D-4 discovery area. These will provide us with an
extensive metallurgical database across the deposit, which could
support a feasibility-level evaluation at Black Pine.”
Key Points:
- Forty-five column leach tests produced a weighted average*
80.8% gold extraction, with a range from 44.5% to 94.8% gold
extraction. See Table 1, below, or click
here: https://libertygold.ca/images/news/2021/October/Gold_Extraction_Data.pdf
- Gold extraction was rapid, with >80% of the leachable gold
extracted within the first 10 days of column leaching. See
Figure 1, below or click
here: https://libertygold.ca/images/news/2021/October/Cumulative_Leach_Curves.pdf
- Percent gold extraction is well-correlated with head grade,
with the highest-grade composites returning the higher extraction
numbers. Of the 45 column tests:
- 18 column tests were conducted on material below 0.5 grams per
tonne (“g/t”) Au, and returned weighted average 71.8% gold
extraction
- 10 column tests were conducted on material between 0.5 g/t Au
and 1.0 g/t Au and returned weighted average 79.0% gold
extraction
- 17 column tests were conducted on material above 1.0 g/t Au,
and returned weighted average 82.3% gold extraction
- For further details see the grade recovery curve in Figure 2 or
click here:
https://libertygold.ca/images/news/2021/October/Grade_Recovery_Curve.pdf
- Phase 4 metallurgical test work has commenced on 15 PQ drill
core composite samples of lower-grade Black Pine mineralization, in
the range 0.10 g/t Au to 0.20 g/t Au. Further PQ core drilling has
commenced in support of a Phase 5 metallurgical program, considered
at this time to be sufficient to support a future feasibility study
at Black Pine, targeting the recent Rangefront D-4 discovery,
Discovery Zone, F Zone, CD Extension and E Zone.
*Weighted average gold extraction is obtained using the
following equation: (composite head grade (grams/tonnes) multiplied
by extraction (%) for all head grades)/sum of all head
grades. Using arithmetic averages tends to over-represent low
grade composites and under-represent high grade composites.
The arithmetic extraction average of the 45 column tests is
76%.
Table 1: Results, Liberty Gold Phase 3 Variability
Composite Testing
Phase 3 Metallurgical Testing |
Fine Bottle Roll |
Coarse Bottle Roll |
Column Tests |
Feed Target P80
(75µm) |
Feed Target P80
(1,700µm) |
Drill Hole ID |
Deposit Area |
Actual Feed P80
(µm) |
Calc Hd Au (g/t) |
Direct Leach Gold Extracted (%) |
Actual Feed
P80(µm) |
Calc Hd Au (g/t) |
Carbon in Leach Gold Extracted (%) |
Actual Feed P80
(µm) |
Calc Hd Au (g/t) |
Gold Extracted (%) |
Actual Feed
P80(mm) |
Calc Hd Au (g/t) |
Gold Extracted (%) |
BP190-#30 |
D1 |
56 |
0.29 |
65.1 |
58 |
0.33 |
68.5 |
1,470 |
0.22 |
49.7 |
11.3 |
0.21 |
47.4 |
BP190-#31 |
D1 |
56 |
0.46 |
69.9 |
38 |
0.46 |
77.3 |
1,590 |
0.40 |
69.3 |
24.0 |
0.40 |
70.5 |
BP190-#32 |
D1 |
65 |
0.62 |
84.4 |
38 |
0.66 |
87.2 |
1,650 |
0.62 |
82.3 |
12.6 |
0.66 |
82.7 |
BP190-#33 |
D1 |
51 |
0.49 |
84.7 |
54 |
0.51 |
89.5 |
1,340 |
0.46 |
86.5 |
12.5 |
0.46 |
89.0 |
BP190-#34 |
D1 |
38 |
0.76 |
73.1 |
46 |
0.77 |
83.4 |
1,410 |
0.80 |
76.3 |
23.8 |
0.76 |
78.5 |
BP190-#35 |
D1 |
48 |
0.35 |
79.3 |
62 |
0.41 |
86.5 |
1,340 |
0.41 |
82.7 |
23.9 |
0.38 |
80.9 |
BP190-#36 |
D1 |
71 |
3.68 |
84.0 |
62 |
3.80 |
89.6 |
1,410 |
3.69 |
83.3 |
10.9 |
3.99 |
87.0 |
BP197-#37 |
D3 |
46 |
1.44 |
71.3 |
60 |
1.73 |
77.2 |
1,490 |
1.46 |
78.6 |
27.9 |
1.31 |
78.4 |
BP197-#38 |
D3 |
64 |
0.25 |
77.6 |
51 |
0.24 |
83.6 |
1,240 |
0.23 |
80.5 |
24.5 |
0.24 |
76.7 |
BP197-#39 |
D3 |
59 |
0.68 |
87.9 |
63 |
0.71 |
90.5 |
1,510 |
0.66 |
87.4 |
22.5 |
0.69 |
85.3 |
BP197-#40 |
D3 |
53 |
2.08 |
89.9 |
52 |
2.22 |
92.5 |
1,810 |
2.11 |
88.4 |
13.7 |
2.01 |
88.9 |
BP197-#41 |
D3 |
65 |
0.53 |
77.3 |
65 |
0.57 |
84.2 |
1,800 |
0.53 |
78.0 |
24.2 |
0.51 |
72.7 |
BP197-#42 |
D3 |
57 |
1.25 |
85.9 |
56 |
1.31 |
91.2 |
1,770 |
1.24 |
88.0 |
11.8 |
1.16 |
86.5 |
BP197-#43 |
D3 |
59 |
0.38 |
68.7 |
66 |
0.41 |
86.2 |
1,490 |
0.42 |
72.3 |
22.6 |
0.34 |
76.1 |
BP207-#44 |
D2 |
60 |
0.22 |
67.8 |
63 |
0.25 |
76.2 |
1,780 |
0.25 |
70.6 |
12.6 |
0.25 |
62.6 |
BP207-#45 |
D2 |
59 |
1.29 |
74.4 |
61 |
1.41 |
79.9 |
1,710 |
1.29 |
71.4 |
22.1 |
1.35 |
80.2 |
BP207-#46 |
D2 |
60 |
0.85 |
76.6 |
66 |
0.88 |
86.5 |
1,280 |
0.85 |
76.6 |
8.9 |
0.73 |
82.5 |
BP207-#47 |
D2 |
54 |
2.68 |
32.6 |
54 |
2.80 |
59.3 |
1,320 |
2.70 |
28.2 |
12.5 |
2.77 |
44.5 |
BP207-#48 |
D2 |
54 |
4.07 |
83.2 |
53 |
4.12 |
86.1 |
1,400 |
3.98 |
79.4 |
24.7 |
4.75 |
80.4 |
BP207-#49 |
D2 |
63 |
1.31 |
79.2 |
42 |
1.38 |
84.3 |
1,610 |
1.33 |
77.5 |
24.3 |
1.47 |
80.2 |
BP214-#50 |
D2 |
60 |
0.30 |
79.0 |
53 |
0.29 |
82.1 |
1,740 |
0.30 |
74.7 |
11.6 |
0.28 |
76.0 |
BP214-#51 |
D2 |
60 |
0.31 |
73.9 |
52 |
0.33 |
80.5 |
170 |
0.32 |
73.0 |
0.2 |
0.32 |
70.9 |
BP214-#52 |
D2 |
65 |
1.00 |
62.1 |
71 |
1.02 |
69.4 |
1,650 |
0.97 |
58.9 |
23.5 |
0.92 |
67.1 |
BP214-#53 |
D2 |
44 |
1.18 |
56.3 |
57 |
1.21 |
72.2 |
1,870 |
1.27 |
57.5 |
12.0 |
1.25 |
66.8 |
BP214-#54 |
D2 |
52 |
4.95 |
88.2 |
67 |
5.77 |
91.0 |
1,340 |
5.51 |
90.8 |
11.1 |
5.86 |
92.2 |
BP214-#55 |
D2 |
53 |
3.93 |
92.5 |
84 |
4.00 |
94.0 |
1,190 |
3.92 |
92.2 |
11.3 |
3.05 |
93.2 |
BP214-#56 |
D2 |
34 |
2.28 |
73.8 |
51 |
2.34 |
77.8 |
1,270 |
2.42 |
73.7 |
12.5 |
2.22 |
76.1 |
BP222-#57 |
D3 |
39 |
0.47 |
83.0 |
55 |
0.50 |
85.5 |
1,560 |
0.50 |
80.4 |
12.1 |
0.42 |
78.1 |
BP222-#58 |
D3 |
53 |
0.25 |
37.4 |
54 |
0.30 |
68.7 |
1,690 |
0.28 |
49.7 |
25.3 |
0.28 |
51.3 |
BP222-#59 |
D3 |
57 |
0.26 |
62.7 |
49 |
0.28 |
80.1 |
2,200 |
0.25 |
62.8 |
25.1 |
0.27 |
72.8 |
BP222-#60 |
D3 |
54 |
0.63 |
82.4 |
53 |
0.74 |
84.9 |
1,650 |
0.62 |
85.1 |
11.2 |
0.66 |
91.7 |
BP222-#61 |
D3 |
56 |
3.83 |
88.3 |
55 |
4.01 |
88.9 |
1,550 |
3.86 |
84.6 |
12.0 |
3.48 |
83.1 |
BP222-#62 |
D3 |
53 |
1.96 |
83.3 |
52 |
2.08 |
90.1 |
1,760 |
1.92 |
78.8 |
23.4 |
1.82 |
78.2 |
BP222-#63 |
D3 |
54 |
0.41 |
79.8 |
53 |
0.48 |
82.7 |
1,480 |
0.45 |
78.5 |
22.9 |
0.42 |
78.7 |
BP231-#64 |
D3 |
53 |
0.26 |
47.1 |
49 |
0.28 |
70.9 |
1,610 |
0.27 |
49.1 |
23.2 |
0.29 |
49.1 |
BP231-#65 |
D3 |
53 |
0.30 |
56.8 |
55 |
0.34 |
87.3 |
1,820 |
0.31 |
72.4 |
28.1 |
0.31 |
83.4 |
BP231-#66 |
D3 |
71 |
0.73 |
83.6 |
72 |
0.75 |
88.4 |
1,490 |
0.71 |
82.2 |
21.4 |
0.71 |
83.5 |
BP231-#67 |
D3 |
55 |
0.72 |
88.5 |
54 |
0.81 |
92.4 |
1,420 |
0.71 |
87.8 |
23.7 |
0.73 |
90.0 |
BP231-#68 |
D3 |
60 |
2.64 |
93.9 |
62 |
2.69 |
95.7 |
1,430 |
2.55 |
94.3 |
10.6 |
2.59 |
94.8 |
BP242-#69 |
F Zone |
59 |
1.18 |
82.2 |
58 |
1.20 |
83.8 |
1,370 |
0.98 |
68.2 |
12.2 |
1.16 |
70.5 |
BP242-#70 |
F Zone |
56 |
3.18 |
92.0 |
58 |
3.25 |
92.7 |
1,560 |
2.88 |
87.4 |
14.7 |
2.97 |
87.1 |
BP242-#71 |
E Pit |
57 |
0.28 |
74.1 |
58 |
0.30 |
75.6 |
1,590 |
0.25 |
61.7 |
13.7 |
0.28 |
66.8 |
BP242-#72 |
E Pit |
55 |
0.41 |
72.9 |
50 |
0.42 |
84.2 |
1,640 |
0.33 |
66.4 |
14.0 |
0.18 |
67.3 |
BP242-#73 |
C/D Pit |
63 |
0.59 |
70.8 |
65 |
0.61 |
78.0 |
1,630 |
0.51 |
51.7 |
13.9 |
0.60 |
54.5 |
BP242-#74 |
C/D Pit |
55 |
0.37 |
79.1 |
59 |
0.38 |
82.5 |
1,600 |
0.25 |
58.3 |
12.3 |
0.36 |
66.7 |
Figure 1: Cumulative Leach Curves Confirm Rapid Leach
Kineticshttps://www.globenewswire.com/NewsRoom/AttachmentNg/0c85b714-93da-4567-9799-f1a493643584
Figure 2: Phase 3 Column Test, Grade Recovery vs. Au
Extraction %
*https://www.globenewswire.com/NewsRoom/AttachmentNg/66552eb3-f6a1-4a23-88d6-88174dd28f57
*Transition Columns: BP207-#47, BP222-#58 & BP231-#64 are
excluded in the above graph.
Metallurgical Program
Samples for this study were obtained through
drilling of seven PQ core holes. Composites were selected
through consideration of rock type, alteration and gold grade to
achieve a wide range of ore types. Program details included:
- Forty-five coarse bottle roll tests (target of 80% passing 10
mesh or 1.7 millimeter (“mm”) particle size) produced a weighted
average 78.7% gold extraction.
- Forty-five fine bottle roll tests (target of 80% passing 200
mesh or 75 micron particle size) produced a weighted average 80.1%
gold extraction for direct leach, and 45 fine bottle roll tests
produced a weighted average 85.7% for carbon in leach (“CIL”).
- Samples for bottle roll testing were milled/crushed
respectively targeting 80% passing 200 mesh (75 microns) and 80%
passing 10 mesh (1.7 mm) particle size. The direct leach
samples were rolled/agitated in bottles in a 1.0 grams per liter
(“g/l”) dilute sodium cyanide (“NaCN”) solution for 72 hours (for
200 mesh) or 144 hours (for 10 mesh). The 200 mesh (75 microns) CIL
samples were rolled/agitated in bottles for 72 hours in a 1.0 g/l
dilute NaCN solution, containing 20 g/l of activated carbon.
- Forty-five column tests targeted 80% passing 0.5 inch (12.7 mm)
and 1 inch (25.4 mm) crushed material and produced a weighted
average 80.8% gold extraction.
- The variability composites were leached continuously between 82
to 99 days, including two on/off cycles for last three weeks at the
end. Crushed material was leached in 10.2 mm and 15.2 mm columns
irrigated by low strength (0.50 g/l) NaCN solution.
- Gold extraction is relatively insensitive to particle size.
Most composites can be projected to coarse particle sizes
approximating run of mine conditions without significant loss of
gold extraction.
- Results generated by this program are consistent with
historical column test results generated by Noranda in 1988 prior
to mining, as well as metallurgical testing by Liberty Gold using
large diameter columns and 300 kilogram bulk samples, and Phase 2
variability composite testing using drill core.
For a map showing locations of drill holes used for
metallurgical testing, see Figure 3, below, or click here:
https://libertygold.ca/images/news/2021/October/BlackPineMet3PRmap.pdf.
Composites were assembled in Elko, Nevada by
Liberty Gold staff, utilizing one-half or three-quarter sawed core,
then shipped to Kappes, Cassiday and Associates in Reno, Nevada for
metallurgical testing, comprising bottle rolls, column testing and
geo-metallurgical characterization, including gold and silver
assays, cyanide solubility, sulphur and carbon speciation,
preg-robbing analysis, ICP geochemical assays, whole rock analysis,
QXRD, modified SMC comminution testing and Bond Abrasion (Ai)
testing.
Figure 3: Locations of Drill Holes Used for Phase 3
Metallurgical
Studyhttps://www.globenewswire.com/NewsRoom/AttachmentNg/71a118f9-186e-4892-ba50-66e0e85f9fd5
QUALIFIED PERSON
Moira Smith, Ph.D., P.Geo., Vice-President
Exploration and Geoscience, Liberty Gold, is the Company's
designated Qualified Person for this news release within the
meaning of National Instrument 43-101 Standards of Disclosure for
Mineral Projects ("NI 43-101") and has reviewed and validated that
the information contained in the release is accurate.
ABOUT LIBERTY GOLDLiberty Gold
is focused on exploring the Great Basin of the United States, home
to large-scale gold projects that are ideal for open-pit mining.
This region is one of the most prolific gold-producing regions in
the world and stretches across Nevada and into Idaho and Utah. We
know the Great Basin and are driven to discover and advance big
gold deposits that can be mined profitably in open-pit scenarios.
Our flagship projects are Black Pine in Idaho and Goldstrike in
Utah, both past- producing open-pit mines, where previous operators
only scratched the surface.
For more information, visit www.libertygold.ca or
contact:
Susie Bell, Manager, Investor Relations Phone:
604-632-4677 or Toll Free 1-877-632-4677
info@libertygold.ca
QUALITY ASSURANCE – QUALITY
CONTROL
Drill composites were calculated using a cut-off
of 0.20 g/t. Drill intersections are reported as drilled
thicknesses. True widths of the mineralized intervals vary between
30% and 100% of the reported lengths due to varying drill hole
orientations but are typically in the range of 60% to 80% of true
width. Drill samples were assayed by ALS Limited in Reno, Nevada
for gold by Fire Assay of a 30 gram (1 assay ton) charge with an AA
finish, or if over 5.0 g/t were re-assayed and completed with a
gravimetric finish. For these samples, the gravimetric data were
utilized in calculating gold intersections. For any samples
assaying over 0.200 ppm an additional cyanide leach analysis is
done where the sample is treated with a 0.25% NaCN solution and
rolled for an hour. An aliquot of the final leach solution is then
centrifuged and analyzed by Atomic Absorption Spectroscopy. QA/QC
for all drill samples consists of the insertion and continual
monitoring of numerous standards and blanks into the sample stream,
and the collection of duplicate samples at random intervals within
each batch. Selected holes are also analyzed for a 51 multi-element
geochemical suite by ICP-MS. ALS Geochemistry-Reno is ISO
17025:2005 Accredited, with the Elko prep lab listed on the scope
of accreditation.
All statements in this press release, other than
statements of historical fact, are "forward-looking information"
with respect to Liberty Gold within the meaning of applicable
securities laws, including statements that address potential
quantity and/or grade of minerals. Forward-looking information is
often, but not always, identified by the use of words such as
"seek", "anticipate", "plan", "continue", "planned", "expect",
"project", "predict", "potential", "targeting", "intends",
"believe", "potential", and similar expressions, or describes a
"goal", or variation of such words and phrases or state that
certain actions, events or results "may", "should", "could",
"would", "might" or "will" be taken, occur or be achieved.
Forward-looking information is not a guarantee of future
performance and is based upon a number of estimates and assumptions
of management at the date the statements are made including, among
others, assumptions about future prices of gold, and other metal
prices, currency exchange rates and interest rates, favourable
operating conditions, political stability, obtaining governmental
approvals and financing on time, obtaining renewals for existing
licenses and permits and obtaining required licenses and permits,
labour stability, stability in market conditions, the impact from
the pandemic of the novel coronavirus (COVID-19), availability of
equipment, timing of assay results, scalability of metallurgical
results, results and accuracy of mineral resources, the
availability of drill rigs, successful resolution of disputes and
anticipated costs and expenditures. Many assumptions are based on
factors and events that are not within the control of Liberty Gold
and there is no assurance they will prove to be correct.
Such forward-looking information, involves known
and unknown risks, which may cause the actual results to be
materially different from any future results expressed or implied
by such forward-looking information, including, risks related to
the interpretation of results and/or the reliance on technical
information provided by third parties as related to the Company’s
mineral property interests; changes in project parameters as plans
continue to be refined; current economic conditions; future prices
of commodities; possible variations in grade or recovery rates; the
costs and timing of the development of new deposits; failure of
equipment or processes to operate as anticipated; the failure of
contracted parties to perform; the timing and success of
exploration activities generally; timing of any preliminary
economic assessments or feasibility assessments; scalability
of metallurgical results, delays in permitting; possible claims
against the Company; labour disputes and other risks of the mining
industry, including impacts from the pandemic of the novel
coronavirus (COVID-19); delays in obtaining governmental approvals,
financing or in the completion of exploration as well as those
factors discussed in the Annual Information Form of the Company
dated March 26, 2021 in the section entitled "Risk Factors", under
Liberty Gold’s SEDAR profile at www.sedar.com.
Although Liberty Gold has attempted to identify
important factors that could cause actual actions, events or
results to differ materially from those described in
forward-looking information, there may be other factors that cause
actions, events or results not to be as anticipated, estimated or
intended. There can be no assurance that such information will
prove to be accurate as actual results and future events could
differ materially from those anticipated in such statements.
Liberty Gold disclaims any intention or obligation to update or
revise any forward-looking information, whether as a result of new
information, future events or otherwise.
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