VANCOUVER,
June 5, 2019 /CNW/
- Tinka Resources Limited ("Tinka" or the
"Company") (TSXV & BVL: TK) (OTCPK:
TKRFF) is pleased to announce the
results of metallurgical testwork on composite zinc sulfide samples
from the Company's 100%-owned Ayawilca property in central
Peru. The metallurgical test program was carried out by XPS
Consulting and Testwork Services, Ontario, under the coordination of
Adam Johnston of Transmin
Metallurgical Consultants.
Key Highlights
- The objective of the testwork was to develop a flowsheet
using standard flotation for the zinc mineralization at West and
South Ayawilca, which was successfully achieved.
- Testwork results have demonstrated that recoveries of 92%
zinc at a concentrate grade of 50% zinc can be consistently
achieved using a standard flotation process. Two locked cycle tests
were carried out on two different styles of mineralization and both
tests produced similar zinc concentrates.
- Potentially deleterious elements in the zinc concentrates
(including silica, manganese, cadmium, mercury, and arsenic) were
well below standard smelter penalty levels. A small penalty
is anticipated for iron content in the concentrate.
- Indium in the two locked cycle zinc concentrates (719 ppm
and 400 ppm, respectively) is very high and potentially payable,
subject to the smelter and commercial arrangements.
- Details of the processing flowsheet for zinc and lead
concentrates will be incorporated into the upcoming Preliminary
Economic Assessment ("PEA"). The Company expects to release
the results of the PEA for the Ayawilca zinc project before the end
of June 2019.
Dr. Graham Carman, Tinka's
President and CEO, stated: "We are very pleased with the results
of the metallurgical testwork, which has been completed to a high
standard, as it predicts very high zinc recoveries from the
mineralization at Ayawilca. We believe the Ayawilca zinc
concentrate will be desirable for many smelters due to the low
levels of silica, manganese and other deleterious elements, as well
as for the high indium levels. We look forward to completing our
PEA before the end of June 2019. As the project progresses,
we will continue to seek improvements in the zinc and lead
metallurgy with additional testwork."
Table 1 highlights final grades and recoveries of two
locked cycle flotation tests (AEC-02 and
AEC-03) and a batch test (AEC-05) on drill core
composite samples from West and South Ayawilca.
Table 1 – Summary of Ayawilca Flotation Test
Results
Composite
|
Test Type
|
Assays (% Zn)
|
Recovery (% Zn)
|
Feed
|
Concentrate
|
AEC-02
|
Locked
cycle
|
10.8
|
50.9
|
92.5
|
AEC-03
|
Locked
cycle
|
10.2
|
50.5
|
94.1
|
AEC-05
|
Batch
cleaner
|
6.5
|
52.1
|
90.7
|
Methodology
A flotation development
program was conducted to determine best conditions for high zinc
recovery to a high quality zinc concentrate. The
program focused on the South and West Ayawilca areas, which host
approximately 50% of the resource and most of the higher grade zinc
zones that would be mined in the early years. While the resulting
composites were higher grade than the average diluted mining
grades, it is believed that the samples were representative of the
different mineral textures that will be encountered at Ayawilca,
and were spatially representative of the South and West Ayawilca
zinc zones, and therefore representative with respect to flotation
performance. The results were used to develop the proposed
flowsheet and reagent scheme that will be discussed in
more detail in the upcoming PEA.
Detail of Sample Composites
- Composite AEC-02 was comprised of 11 quarter core samples
from 11 drill holes at West and South Ayawilca (91.6 m sampled). Composite AEC-02 had relatively
high Zn/S ratios (i.e., low pyrite content) and relatively
coarse-grained sphalerite textures.
- Composite AEC-03 was comprised of 17 quarter core samples
(all different to AEC-02) from 15 drill holes at West and South
Ayawilca (129.7 m sampled).
Composite AEC-03 had relatively low Zn/S ratios (i.e., high pyrite
content) and finer grained sphalerite textures.
- Composite AEC-05 was comprised of 4 quarter core samples
(all used in AEC-03) from 4 drill holes at West and South Ayawilca
(39.5 m sampled). Composite
AEC-05 had relatively low Zn/S ratios (i.e., high pyrite content)
and relatively fine grained sphalerite textures.
- Two high pyrrhotite quarter core samples were not
included in the tests. The pyrrhotite mineralization at
Ayawilca is a minor and discrete geometallurgical domain that will
be studied in future flotation development phases.
Detailed assays of the two locked cycle concentrates are
presented in Table 2.
Table 2 – Detailed Analyses of Locked Cycle
Concentrates AEC-02 and AEC-03 from Ayawilca
Analyte
|
Unit
|
Detection
Limit
|
AEC-02
|
AEC-03
|
Analyte
|
Unit
|
Detection
Limit
|
AEC-02
|
AEC-03
|
Al
|
%
|
0.01
|
0.03
|
0.03
|
Sr
|
ppm
|
3
|
16
|
21
|
As
|
ppm
|
5
|
319
|
242
|
Ta
|
ppm
|
0.2
|
< 0.2
|
< 0.2
|
B
|
ppm
|
10
|
< 10
|
< 10
|
Tb
|
ppm
|
0.1
|
< 0.1
|
< 0.1
|
Ba
|
ppm
|
3
|
4
|
4
|
Te
|
ppm
|
6
|
< 6
|
< 6
|
Be
|
ppm
|
3
|
< 3
|
< 3
|
Th
|
ppm
|
0.1
|
0.2
|
0.1
|
Bi
|
ppm
|
2
|
26
|
22
|
Ti
|
%
|
0.01
|
< 0.01
|
< 0.01
|
Ca
|
%
|
0.01
|
0.05
|
0.05
|
Tl
|
ppm
|
0.1
|
1.5
|
2.7
|
Cd
|
ppm
|
2
|
1800
|
1650
|
Tm
|
ppm
|
0.1
|
< 0.1
|
< 0.1
|
Ce
|
ppm
|
0.8
|
0.9
|
< 0.8
|
U
|
ppm
|
0.1
|
1.1
|
1.2
|
Co
|
ppm
|
0.2
|
8.5
|
11
|
V
|
ppm
|
5
|
< 5
|
< 5
|
Cr
|
ppm
|
30
|
90
|
90
|
W
|
ppm
|
0.7
|
1.1
|
0.8
|
Cs
|
ppm
|
0.1
|
1
|
0.9
|
Y
|
ppm
|
0.1
|
1
|
0.9
|
Cu
|
ppm
|
2
|
2280
|
1880
|
Yb
|
ppm
|
0.1
|
< 0.1
|
< 0.1
|
Dy
|
ppm
|
0.3
|
< 0.3
|
< 0.3
|
Zn
|
%
|
0.01
|
50.9
|
50.5
|
Er
|
ppm
|
0.1
|
< 0.1
|
< 0.1
|
Au
|
ppb
|
2
|
60
|
21
|
Eu
|
ppm
|
0.1
|
0.1
|
< 0.1
|
Pd
|
ppb
|
5
|
< 5
|
< 5
|
Fe
|
%
|
0.05
|
13.1
|
14
|
Pt
|
ppb
|
5
|
< 5
|
11
|
Ga
|
ppm
|
0.2
|
11.7
|
10.6
|
Ag
|
ppm
|
3
|
52
|
51
|
Gd
|
ppm
|
0.1
|
0.1
|
0.1
|
Hg
|
ppb
|
5
|
4570
|
4510
|
Ge
|
ppm
|
0.7
|
0.9
|
1.5
|
C-Total
|
%
|
0.01
|
0.15
|
0.21
|
Ho
|
ppm
|
0.2
|
< 0.2
|
< 0.2
|
S-Total
|
%
|
0.01
|
33.9
|
34.1
|
Hf
|
ppm
|
10
|
< 10
|
< 10
|
Co3O4
|
%
|
0.005
|
< 0.005
|
< 0.005
|
In
|
ppm
|
0.2
|
719
|
399
|
CuO
|
%
|
0.005
|
0.303
|
0.253
|
K
|
%
|
0.1
|
< 0.1
|
< 0.1
|
NiO
|
%
|
0.003
|
0.008
|
0.006
|
La
|
ppm
|
0.4
|
0.5
|
< 0.4
|
SiO2
|
%
|
0.01
|
0.74
|
0.46
|
Li
|
ppm
|
3
|
24
|
24
|
Al2O3
|
%
|
0.01
|
0.08
|
0.1
|
Mg
|
%
|
0.01
|
0.16
|
0.1
|
Fe2O3(T)
|
%
|
0.01
|
16.94
|
18.32
|
Mn
|
ppm
|
3
|
1190
|
1700
|
MnO
|
%
|
0.001
|
0.144
|
0.206
|
Mo
|
ppm
|
1
|
5
|
5
|
MgO
|
%
|
0.01
|
< 0.01
|
< 0.01
|
Nb
|
ppm
|
2.4
|
< 2.4
|
< 2.4
|
CaO
|
%
|
0.01
|
< 0.01
|
< 0.01
|
Nd
|
ppm
|
0.4
|
< 0.4
|
0.4
|
Na2O
|
%
|
0.01
|
< 0.01
|
< 0.01
|
Ni
|
ppm
|
10
|
20
|
10
|
K2O
|
%
|
0.01
|
0.01
|
0.01
|
Pb
|
ppm
|
0.8
|
821
|
4830
|
TiO2
|
%
|
0.01
|
0.01
|
0.01
|
Pr
|
ppm
|
0.1
|
0.1
|
0.1
|
P2O5
|
%
|
0.01
|
0.01
|
0.01
|
Rb
|
ppm
|
0.4
|
0.7
|
0.4
|
Cr2O3
|
%
|
0.01
|
0.01
|
0.01
|
Sb
|
ppm
|
2
|
25
|
34
|
V2O5
|
%
|
0.003
|
< 0.003
|
< 0.003
|
Se
|
ppm
|
0.8
|
2.6
|
2.4
|
Cl
|
%
|
0.01
|
0.03
|
0.02
|
Si
|
%
|
0.01
|
0.39
|
0.26
|
F
|
%
|
0.01
|
0.02
|
0.01
|
Sm
|
ppm
|
0.1
|
0.1
|
0.2
|
CO3 (calc)
|
%
|
0.01
|
0.25
|
0.59
|
Sn
|
ppm
|
0.5
|
378
|
413
|
LOI
|
%
|
|
15.26
|
15.52
|
|
|
|
|
|
|
|
|
|
|
Notes to Table 2. Assays were carried
out by Activation Laboratories, Ancaster,
Ontario
Elements (except precious metals,
zinc) were analysed using peroxide fusion, ICP-OES and
ICP-MS.
Zinc was analysed by peroxide fusion and
ICP-OES.
Precious metals (Au, Pd, Pt, Ag) were
analysed with fire assay and ICP-OES finish.
Hg
was analysed by cold vapour FIMS.
C-Total and
S-Total were analysed by infra-red
techniques.
Oxides were analysed by whole rock
analysis XRF.
Qualified Person
The results of the
metallurgical tests have been reviewed and verified by Mr
Adam Johnston, FAusIMM, CP
(Metallurgy) of Transmin Metallurgical Consultants, Lima, a qualified person as defined by
National Instrument 43-101. Mr Johnston has 25 years of mineral
processing experience and is a Fellow of the Australasian Institute
of Mining and Metallurgy.
Dr. Graham Carman, Tinka's
President and CEO, reviewed, verified and compiled the technical
contents of this release. Dr Carman is a
Fellow of the Australasian Institute of Mining and Metallurgy, and
is a qualified person as defined by National Instrument
43-101.
About Tinka Resources Limited
Tinka
is an exploration and development company with its flagship
property being the 100%-owned Ayawilca carbonate replacement
deposit (CRD) in the zinc-lead-silver belt of central Peru, 200 kilometres northeast of Lima. The Ayawilca Zinc Zone contains 11.7 Mt
of Indicated Resources grading 6.9% zinc, 0.2% lead, 15 g/t silver
and 84 g/t indium and 45.0 Mt Inferred Resources grading 5.6% zinc,
0.2% lead, 17 g/t silver and 67 g/t indium. The Ayawilca Tin
Zone contains an Inferred Mineral Resource of 14.5 Mt at 0.63% tin,
0.21% copper & 18 g/t silver (November
26, 2018 release). A PEA is underway with results
anticipated by end of Q2 2019.
On behalf of the Board,
"Graham Carman"
Dr. Graham Carman, President &
CEO
Forward Looking Statements: Certain
information in this news release contains forward-looking
statements and forward-looking information within the meaning of
applicable securities laws (collectively "forward-looking
statements"). All statements, other than statements of
historical fact are forward-looking statements. Forward-looking
statements are based on the beliefs and expectations of Tinka as
well as assumptions made by and information currently available to
Tinka's management. Such statements reflect the current
risks, uncertainties and assumptions related to certain factors
including, without limitations, drilling results, the
Company's expectations regarding the Ayawilca Project PEA,
capitaland other costs varying significantly from estimates,
production rates varying from estimates, changes in world metal
markets, changes in equity markets, uncertainties relating to the
availability and costs of financing needed in the future, equipment
failure, unexpected geological conditions, imprecision in resource
estimates or metal recoveries, success of future development
initiatives, competition, operating performance, environmental and
safety risks, delays in obtaining or failure to obtain necessary
permits and approvals from local authorities, community agreements
and relations, and other development and operating risks. Should
any one or more of these risks or uncertainties materialize, or
should any underlying assumptions prove incorrect, actual results
may vary materially from those described herein. Although
Tinka believes that assumptions inherent in the forward-looking
statements are reasonable, forward-looking statements are not
guarantees of future performance and accordingly undue reliance
should not be put on such statements due to the inherent
uncertainty therein. Except as may be required by applicable
securities laws, Tinka disclaims any intent or obligation to update
any forward-looking statement.
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 news release
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SOURCE Tinka Resources Limited