Nevada Zinc Corporation (“Nevada Zinc” or the “Company”) (TSX-V:
NZN) announces the filing on SEDAR of its independent Preliminary
Economic Assessment (“PEA”) of the viability of potentially mining
the zinc mineralization at the Company’s 100% owned Lone Mountain
Project (“Project”) in central Nevada. The June 27, 2019 PEA
highlights strong potential economics for a low cost, relatively
simple, open pit zinc mine and flotation plant operating,
producing, and selling zinc concentrate for 12 years based on the
current Mineral Resource. The process plant operating rate is
planned to be a nominal 800 tonnes per day (“tpd”). Using a long
term average zinc price of US $1.13 per pound and an 8% discount
rate, the Project generates a pre-tax Net Present Value (“NPV”) of
US $56.4 M ($75.2 M CDN) and a pre-tax 40% Internal Rate of Return
(“IRR”). The after tax NPV (8%) is $43.2 M ($57.6 M CDN) and the
after tax IRR is 35%. All currency is stated in USD unless
indicated otherwise.
Table 1 - PEA Summary
Parameters |
USD |
CAD |
Pre-Tax IRR |
40% |
|
Pre-Tax NPV 8% |
$56.4 M |
$75.2 |
After Tax IRR |
35% |
|
After Tax NPV 8% |
$43.2 M |
$57.6 M |
Payback Period (After Tax), (years) |
2.7 |
|
Average Annual Zinc Production (lbs. contained) |
35.2 M |
|
Average Annual Zinc Payable (85%) (lbs. payable) |
30.0 M |
|
Pre-production Capex |
$25.7 M |
$34.3 M |
Mine Life (years) |
12 |
|
Anticipated Process Plant Throughput (Average tpd) |
800 |
|
Operating Days per Year |
347 |
|
Mineral Resource Tonnage (tonnes) |
3,257,000 |
|
Mineral Resource Grade (zinc only) |
7.57% |
|
Anticipated Process Plant Recovery |
80% |
|
Anticipated Grade of Concentrate Produced |
45% |
|
Zinc Price for PEA Study (per pound) |
$1.13 |
|
Foreign Exchange Rate (CAD/USD) |
0.75 |
|
|
|
|
PEA Cautionary NoteReaders are
cautioned that the PEA is preliminary in nature and there is no
certainty the results of the PEA will be realized. The PEA is based
on inferred mineral resources that are considered too speculative
geologically to have economic considerations applied to them that
would enable them to be categorized as mineral reserves. A Mineral
Resource is not a Mineral Reserve and does not have demonstrated
economic viability. Additional drilling and studies are required to
upgrade the Inferred Mineral Resource to a Mineral Reserve.
Table 2 – Overview of the PEA
Results
|
|
Base Case (USD) |
Base Case (CAD) |
|
|
|
|
Commodity Assumption |
Zinc Price $/lb |
$ 1.13 |
|
|
$/tonne |
$ 2,500 |
|
|
|
|
|
Economics Pre-Tax |
Net Cash Flow |
$106.7 M |
$142.2 M |
|
NPV @ 8% |
$ 56.4 M |
$ 75.2 M |
|
IRR |
40% |
|
|
|
|
|
Economics After Tax |
Net Cash Flow |
$ 83.8 M |
$111.7 M |
|
NPV @ 8% |
$ 43.2 M |
$ 57.6 M |
|
IRR |
35% |
|
|
Payback Period |
2.7 years |
|
|
|
|
|
Capital and Operating Cost
Estimates
Table 3 – Initial and Sustaining Capital Costs
(CAPEX)
Area |
Start-upCapital ($ M) |
SustainingCapital ($ M) |
Total ($ M) |
Mining (Contractor – mobilization) |
2.0 |
|
|
2.0 |
|
Site Development/Infrastructure |
2.0 |
|
|
2.0 |
|
Mineral Processing |
14.0 |
|
|
14.0 |
|
Tailings Management Facility |
1.0 |
|
|
1.0 |
|
Closure |
0.5 |
|
|
0.5 |
|
Salvage Value |
(0.5 |
) |
|
(0.5 |
) |
Contingencies (30%) |
5.7 |
|
|
5.7 |
|
Owners’ Costs |
1.0 |
|
|
1.0 |
|
Sustaining Capital |
|
2.2 |
2.2 |
|
Total |
25.7 |
|
2.2 |
27.9 |
|
|
|
|
|
|
|
Table 4 – Operating Costs
(OPEX)
Area |
Cost per tonne ofMineralized Material($) |
Cost per unit |
Unit |
Open Pit Mining |
19.50 |
$3.50/t Mineralized Material$2.00/t Waste |
per tonne processed |
Crushing |
3.00 |
|
per tonne processed |
Processing |
22.20 |
|
per tonne processed |
G&A |
2.00 |
|
per tonne processed |
Total OPEX |
47.70 |
|
per tonne processed |
|
Note: PEA assumed that start-up working capital would be provided
by concentrate purchaser on revolving credit basis. |
|
The PEA was undertaken at the request of Bruce
Durham, P.Geo., President and CEO of the Company and was prepared
by Peimeng Ling and Associates Limited (“PL&A”) in accordance
with the requirements of NI-43-101 Standards of Disclosure for
Mineral Projects (“NI-43-101”). Peimeng Ling, P.Eng. (MSc. Chemical
Engineering), the principal author of the Technical Report, is an
independent Qualified Person (as that term is defined by Canadian
regulatory guidelines) in respect of the preparation of the PEA
Technical Report discussed in this press release. Her experience
includes over 35 years experience in the chemical and metallurgical
processing field including project evaluation and project
management. Other Qualified Persons contributing to the report as
filed include; Fred Brown, P.Geo., Garth Wilcox, P.Eng., David
Burga, P.Geo., Jarita Barry, P. Geo., Richard Sutcliffe,
PH.D., P.Geo, Eugene Puritch, P.Eng., FEC, CET.
Table 5 - Mineral Resource
Estimate
Cut-Off Zinc % |
Tonnage (000’s) |
Pb% |
Zinc% |
Zinc M lb |
5% |
1,989 |
0.8 |
10.05 |
440 |
4% |
2,473 |
0.7 |
8.97 |
489 |
3% |
2,931 |
0.7 |
8.12 |
525 |
2% |
3,257 |
0.7 |
7.57 |
543 |
1% |
3,534 |
0.7 |
7.09 |
552 |
Notes: Numbers in Table 5 are from P&E
Mining Consultants Inc. report dated July 22, 2018 “Initial Mineral
Resource Estimate and Technical Report on the Lone Mountain
Property Eureka Nevada USA”. A 2% NSR royalty is payable to the
original property vendor on the majority of the Property. All
material tonnes and metal values are undiluted. Mineral Resources
are calculated assuming a 2% zinc cut-off. Mineral Resources which
are not Mineral Reserves do not have demonstrated economic
viability. The estimate of Mineral Resources may be materially
affected by environmental, permitting, legal, title,
socio-political, marketing or other relevant issues. Details of the
Mineral Resource Estimate can be found in the technical report
filed on SEDAR under the Company's profile and dated September 7,
2018.
Mining
The mineralization on the Project extends to
surface and is amenable to conventional open pit mining methods
utilizing front end loaders and trucks. An optimized pit shell was
constructed using indicative costs for the area, including $2.50/t
mining costs for waste, $3.50/t mining costs for mineralized
material, a zinc price of $1.25 per pound, process recovery of 85%,
smelter payout of 85%, and smelter charges and freight per tonne of
concentrate of $200/t, in addition to processing costs of $20/t and
G&A of $3.00/t per tonne of mineralized material. (P&E
Mining Consultants Inc. 2018 see note above). Slight modifications
were made to some of the parameters in light of additional
investigations and results from additional metallurgical test work.
The PEA established mining costs to be $2.00/t for waste and
$3.50/t for mineralization. Process plant recovery was set at 80%,
smelter payout was set as 85% and the achievable Zinc concentrate
grade was determined to be 45% for the study while G&A was set
at $2.00/t. No optimization of the planned mining of the deposit
was carried out in the preparation of the PEA.
Table 6 - Processing Plant Feed
Schedule
Year |
Total Process Plant Feed (tonnes
000’s)Undiluted |
Zinc Grade(Mineral
ResourceGrade) |
Pounds ofZincContained inConcentrate (M) |
Total MaterialMined(tonnes
000’s) |
1 |
264 |
7.57 |
% |
35.2 |
2,373 |
2 |
264 |
7.57 |
% |
35.2 |
2,373 |
3 |
264 |
7.57 |
% |
35.2 |
2,373 |
4 |
264 |
7.57 |
% |
35.2 |
2,373 |
5 |
264 |
7.57 |
% |
35.2 |
2,373 |
6 |
264 |
7.57 |
% |
35.2 |
2,373 |
7 |
264 |
7.57 |
% |
35.2 |
2,373 |
8 |
264 |
7.57 |
% |
35.2 |
2,373 |
9 |
264 |
7.57 |
% |
35.2 |
2,373 |
10 |
264 |
7.57 |
% |
35.2 |
2,373 |
11 |
264 |
7.57 |
% |
35.2 |
2,373 |
12 |
264 |
7.57 |
% |
35.2 |
2,373 |
13 |
89 |
7.57 |
% |
11.9 |
837 |
Total |
3,257 |
7.57 |
% |
434.3 |
29,313 |
|
Note: Total material mined values include all production from open
pit mining (mineralization plus waste). |
|
Process
The Company and its consultants have been
carrying out mineralogical and metallurgical investigations on the
Project’s non-sulphide zinc mineralization since October 2015.
During that time the Company has completed thin section
investigations, polished thin section work, Heavy Liquid Separation
studies, whole rock dissolution using sulphuric acid, Tescan
Integrated Mineral analyser tests, concentrate production tests
using flotation techniques to concentrate the mineralization, as
well as acid dissolution teswork on flotation concentrate and have
also completed initial dissolution test work using the METSOL
proprietary process on mineralized rock samples. The dissolution
testwork on flotation concentrate material using sulphuric acid was
designed to target the dissolution of the zinc minerals to produce
a liquid comprised primarily of zinc sulphate. Zinc sulphate
product was targeted as an end product that would ideally be an end
product for use in the fertilizer or animal food businesses. The
dissolution test work completed using the METSOL process was aimed
at determining the viability of leaching zinc bearing rock without
dissolving the associated calcite and dolomite to produce chemical
grade zinc oxide.
The recoverable, and potentially payable
mineralization on the Project is comprised of zinc oxide and
carbonate and minerals. Through the various investigations, the
smithsonite and hemimorphite/willemite were found to be moderately
liberated at a grind size P80 of 600 microns, 57% and 72%
respectively. Additional grinding was found to liberate more of the
zinc mineralization.
Flotation test work was carried out at SGS,
Lakefield Ontario. Initial test work showed 96% recoveries and
produced concentrate with approximately 30% zinc content. Other
tests that were completed as follow-up which produced zinc
recoveries over 80% recovery and grading more than 40% zinc.
Because the tests were preliminary and single batch tests only, it
is reasonable to assume that a higher grade of concentrate, up to
45% could be produced with recovery of approximately 80% in more
advanced testwork. Another bulk flotation test produced a 46% zinc
concentrate with a 67.4% recovery. Again, the sample was a batch
test only, so in a locked cycle environment it is considered
reasonable that a 45% zinc concentrate could be produced at an 80%
recovery rate.
As part of the plan by the Company to determine
the best approach to maximize the value of the mineralization, the
Company had SGS undertake leach test work using sulphuric acid to
attempt leaching of the flotation concentrate. Test work by Outotec
in 2016 showed the unconcentrated mineralization was readily
leached however the high acid consumption rates would not allow the
dissolution of raw mineralization to be a viable processing route.
SGS completed 9 leach tests on various flotation concentrates. On
the basis of the 9 tests, the conclusions were that in most of the
tests, high zinc extraction was achieved. The method of acid
addition seemed to have an effect on extraction of silicon. When
acid was added slowly only limited silicon was dissolved (~5%).
A report by Metsol in March 2017 describing work
completed by them reported the results of leaching of mineralized
samples from the Project using the Metsol process, a non-acid leach
technique. That work showed the mineralization had characteristics
well suited for the leaching of mineralization to produce a zinc
oxide product. Leach extraction was shown to be in the range of 80%
to over 90% in the 6 samples processed. Post leaching roasting of
the material produced a purity of 99.3%.
Table 7 – Sensitivitiy analysis NPV 8%
Pre-Tax Base Case
|
|
|
NPV |
NPV |
NPV |
IRR |
Item |
Variances |
Value |
0% |
5% |
10% |
% |
|
|
|
|
|
|
|
Initial Capital Cost ($M) |
+15%Base Case-15% |
221916 |
104107110 |
687175 |
454852 |
354047 |
Total OPEX ($M) |
+15%Base Case-15% |
151311 |
83107131 |
537189 |
354862 |
324048 |
Zinc metal price $/t Zn Metal |
+15%Base Case-15% |
2,8752,5002,125 |
16810745 |
1167126 |
834814 |
604019 |
Zinc Grade |
+15%Base Case-15% |
8.7%7.57%6.4% |
15110762 |
1047139 |
734824 |
544026 |
|
|
|
|
|
|
|
Infrastructure
The Project is ideally located in east central
Nevada, approximately 28 kilometres to the northwest of Eureka
Nevada, a mining focused area that continues to be supportive of
mining development. Highway 50 which provides the main access
between Reno Nevada and Eureka passes along the southern boundary
of the Project and a year round county maintained road provides
access to the eastern part of the Project. Existing unmaintained
roads provide access to the planned area of operations.
High voltage power transmission lines are
located just to the south of the Project near Highway 50. The PEA
contemplates generating power using diesel power. The determination
was made that a single 1.5 MW diesel generator is sufficient to
provide the power needed for the operation as planned in the PEA. A
back-up generator is also included in the plan. Future planned
power supply studies include the possibility of using LNG as a fuel
for generated power. Primary power generation will be located
in proximity to the grinding facility in order to minimize power
line requirements.
Water required for operations and general site
purposes would be be supplied by local well sites located as close
as possible to the plant location. No plan has been developed on
the location of available wells or water rights. The Company has
engaged in initial reviews of the possibilities for water rights
and will continue the investigation of available water near the
project site.
Permits
The Project is located on public BLM lands and
patent land. To-date the Company has disturbed less than 5 acres
and in order to increase the footprint of disturbance the Company
will require a Exploration Plan of Operations (PoO). Mining and
exploration activities included in the PoO will require items such
as a description of surface disturbance activities, preliminary
design reports and a description of waste rock, mineralized
material, spent heap and ground water characterization. A
Reclamation Plan describing the construction and closure of each
facility with the associated bond cost estimate as applicable is
also required. Future activities creating more than five acres of
disturbance will also require that the BLM perform an appropriate
National Environmental Policy Act analysis (NEPA), likely an
Environmental Assessment. The NEPA analysis assesses the potential
for impacts to all resources from the proposed project. No survey
work has been initiated at this time although plans are being made
to undertake the work.
Additional information about the Company is
available on the Company’s website: www.nevadazinc.com
Bruce Durham P.Geo. Company Qualified Person,
President and CEO of Nevada Zinc and Peimeng Ling, P.Eng. of
Peimeng Ling Independent Qualified Person of Peimeng Ling and
Associates Limited, have read and approved the technical
information contained in this press release. Both Mr. Durham and
Ms. Ling are Qualified Persons as defined by Canadian regulatory
guidelines under NI 43-101.
Some numbers in this release are rounded and
therefore some discrepancies may be present in the totals
shown.
For further information contact:
Nevada Zinc Corporation Suite 1660 141
Adelaide St. West Toronto, Ontario M5H 3L5 Tel: 416-504-8821
Bruce Durham, President and CEO bdurham@nevadazinc.com
www.nevadazinc.com
Caution Regarding Forward-Looking
Statements
This news release may contain forward-looking
statements including but not limited to comments regarding the
timing and content of upcoming work programs, geological
interpretations, receipt of property titles, potential mineral
recovery processes, etc. Forward-looking statements address
future events and conditions and therefore, involve inherent risks
and uncertainties. Actual results relating to, among other
things, results of exploration, project development, reclamation
and capital costs of the Company's mineral properties, and the
Company's financial condition and prospects, could differ
materially from those currently anticipated in such statements.
These and other factors should be considered carefully and readers
should not place undue reliance on the Company's forward-looking
statements. The Company does not undertake to update any
forward-looking statement that may be made from time to time by the
Company or on its behalf, except in accordance with applicable
securities laws.
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.
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