ENP Newswire -
Release date- 04092014 -
The maiden PEA (reported in a Company news release on
The PEA Update (30,000 tonnes per day base case scenario) significantly reduces initial capital. Initial capital is further reduced with an alternative 'ramp-up' case that starts with a smaller 7,000 tonnes per day mill and ramps up to 30,000 tonnes per day by Year 6. The PEA Update uses:
The same resource model as the maiden PEA;
Base Case mill throughput of 30,000 tonnes per day;
Mine production schedule which targets higher grades earlier and results in improvements to the maiden PEA;
A new waste model incorporating significantly lower specific gravity for the volcanic rock unit;
Lower mining costs for the volcanic unit based on a review of its characteristics;
Waste rock from the volcanic unit constitutes more than 90% of pre-stripping material which results in a significant reduction of initial capital;
The adoption of conveying to the mill.
All other inputs and parameters for the PEA update remain the same as the maiden PEA including base case metal prices (
Highlights of the PEA update are summarised below (all values shown are in $US).
PEA UPDATE HIGHLIGHTS:
Base Case Improvements:
Pre-tax Net Present Value ('NPV') of
After-tax (including new Mexican Mining Duties) NPV (5%) of
After-tax payback of
Initial production rate of 7,000 tonnes per day expanding to 30,000 tonnes per day in year 6;
After-tax payback of initial capital in 4.5 years and after-tax payback of expansion capital in 0.4 years.
Expansion is financed internally from cash flows in years 4 and 5;
Pre-tax NPV (5%) of
After-tax (including new Mexican Mining Duties) NPV (5%) of
It should be noted that the PEA and PEA UPDATE are preliminary in nature as they include inferred mineral resources which are considered too speculative geologically to have the economic considerations applied that would enable them to be categorized as mineral reserves. There is no certainty that the PEA or PEA Update forecasts will be realized or that any of the resources will ever be upgraded to reserves. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
J. D. Poliquin, Chairman of Almaden reported, 'This PEA update shows material improvements to the potential economic viability of the Ixtaca project. The ramp-up case demonstrates the potential for a lower initial capital start up for the deposit.
The PEA update highlights the significance of the Ixtaca deposit on a world scale; the projected average annual silver production could make Ixtaca one of the top 20 silver projects in the world. We now look forward to continued exploration progress which may grow Ixtaca as we continue working on a PFS to further de-risk the project and initiate the permitting process.'
Geology and Mineral Resources
The Ixtaca deposit is an epithermal gold-silver deposit, mostly hosted by veins in carbonate units (calcareous clastic rocks) and crosscutting pre-mineral altered dykes ('basement rocks') with a minor component of disseminated mineralization hosted in overlying volcanic rocks. Wireframes constraining mineralized domains were constructed based on geologic boundaries defined by mineralization intensity and host rock type.
Higher grade zones occur where there is a greater density of epithermal veining. These higher grade domains have good continuity and are cohesive in nature.
Production and Processing
The Ixtaca gold-silver project is planned as an open pit mining operation using contractor mining. Contactor mining operating costs are assumed to be higher than expected owner-operated mining costs. Major mining equipment is comprised of 177- tonne capacity haul trucks with 27m3 shovels. The estimated mining inventory is comprised of 218 million tonnes of rock and 125 million tonnes of mineralized material with an average mill feed grade of 0.430 grams per tonne gold and 25.71 grams per tonne silver.
A total of 1.56 million ounces of gold and 93.5 million ounces of silver would be produced over the life of mine. The PEA Update base case includes a 30,000 tonne per day process plant to produce gold and silver dore on site. The process plant includes conventional crushing, grinding, gravity, flotation, concentrate leaching and Merrill-Crowe extraction process. Average process recoveries for gold and silver are expected to be 90% based on test work carried out at the
Capital and Operating Costs
The total estimated initial capital cost for the Ixtaca gold-silver project is
Economic Results and Sensitivities
A summary of financial outcomes comparing base case metal prices for both start-up scenarios to two alternative metal price situations are presented below. The three metal price scenarios match the maiden PEA scenarios.
The maiden PEA base case prices were derived from a combination of spot prices in 2014 and current common peer usage. The Alternate Case prices represented the lowest sustained prices of the metals over the previous three years. The 3 year trailing average prices represented the upside potential should metal prices regain their previous strength.
Rock Management, Environment and Community
Almaden recognises the paramount importance of protecting the environment and, to facilitate the development of a sustainable project.
Protect surface and ground water quality;
Incorporate environmental enhancement opportunities into the mine and final reclamation plans;
Minimize the project footprint.
In order to achieve these objectives Almaden and KP have instituted the following management strategies towards the submission of a Mexican Environmental Impact Statement.
Water Management - Almaden with KP has developed a comprehensive 2014 water management strategy including the commencement of a hydrometric and climate monitoring program, and the drilling of water measurement wells. The latest modelling using regional weather patterns suggest that management of rainfall and runoff from within the project area will provide sufficient water for continuous operations for the Ixtaca mine plan. Currently local communities use existing water supplies that come from natural springs located at higher elevations and upstream of the Ixtaca deposit.
Stream flow upstream of the project will be either diverted around or collected, potentially creating a new fresh water supply source for local use, or used for mining and milling processes and before any would be discharged it would be treated to meet environmental guidelines.
Management of Rock - The limestone host rock, which constitutes approximately 1/3 of the total waste rock has buffering capacity. Static geochemical testing is currently underway to characterize this further. Environmental Monitoring - Groundwater monitoring to ensure compliance with all applicable best management practice (BMP) technologies is a fundamental component of the Project. Flora and fauna studies are also underway.
Community - The Ixtaca deposit and any potential mining operation will be located in an area previously logged or cleared. Existing land use in the project area is minimal. The Company has employed up to 70 local people in its drilling program who live local to the Ixtaca deposit. Local employees make up virtually all the drilling staff, who have been trained on the job to operate the Company's wholly owned drills.
The Company has implemented a comprehensive science based and objective community relations and education program for employees and all local stakeholders to transparently explain the exploration program underway as well as the potential impacts and benefits of any possible future mining operation at Ixtaca. The Company regards the local communities to be major stakeholders in the Ixtaca deposit's future along with the Company's shareholders.
Every effort is being made to create an open and clear dialogue with our stakeholders to ensure that any possible development scenarios that could evolve from the anticipated future studies are properly understood and communicated throughout the course of the Company's exploration and development program. The Company invites all interested parties to visit www.almadenminerals.com to find out more about our community development, education and outreach programs.
Economic Impacts - The economic analysis set out in the PEA update also provides some possible indications of the potential economic impact of the
Direct employment of more than 400 people during the construction phase and 430 people during the subsequent approximately 12 year operating phase;
Gross investment of approximately
Metallurgical Gold and Silver Test Work
Almaden has previously reported preliminary metallurgical test results. These first test results showed that standard gravity and flotation techniques could result in non-optimised gold and silver recoveries that are roughly equivalent for each geological domain. This preliminary test work indicates that leaching the combined gravity/flotation concentrate can produce a gold and silver dore on site. All geologic domains were tested using whole core composites selected to represent a range of grades.
Subsequent to the publication of the preliminary results, in 2013, additional metallurgical work, on the original and new whole core composites, focused on optimizing gravity and rougher flotation results over a broader range of head grades. At present the preliminary test work performed to date indicates overall Au and Ag recoveries from a combination of flotation and gravity concentration and intensive leaching of this combined concentrate to average 90% for Au and Ag across all geologic domains.
Further PFS-level metallurgical test work focusing on process optimization is currently underway on variability samples collected from fresh drill core. This program will focus on the optimisation of the gravity/bulk flotation/concentrate and intensive leaching process.
Next Engineering and Development Steps
The Company has initiated work towards a Pre-Feasibility Study. Apart from further metallurgical studies (underway), the work initiated includes geo-mechanical (field work completed) and geotechnical (underway) drilling, static geochemical test work (underway) to characterise rock chemistry and long lead time environmental and water monitoring.
Other work underway currently includes environmental baseline monitoring such as flora and fauna studies, climate monitoring, water quality sampling and surface water hydrology monitoring. A NI 43-101 technical report for the Ixtaca Deposit PEA Update will be filed on SEDAR (www.sedar.com) within 45 days.
MMTS is an association of Geologists, Engineers and Technicians providing experienced knowledge in Geology, Mine Engineering, and Metallurgical Services and Support to the mining industry for over 15 years. Through their network of associates they provide an integrated team of experts and QP's. Services range from early grassroots exploration and development, block model builds, resource and reserve estimates, advanced planning and studies for mine proposals (including operational support), process design and permitting process guidance and support.
MMTS has experience working on coal, gold, silver, copper, molybdenum, and tungsten deposits throughout
Samples that return values greater than 10 g/t gold using this technique are then re analysed by fire assay but with a gravimetric finish. Silver is first analysed by Inductively Coupled Plasma - Atomic Emission Spectroscopy ('ICP-AES').
Samples that return values greater than 100 g/t silver by ICP-AES are then re analysed by HF HNO3-HCLO4 digestion with HCL leach and ICP-AES finish. Of these samples those that return silver values greater than 1,500 g/t are further analysed by fire assay with a gravimetric finish. Blanks, field duplicates and certified standards were inserted into the sample stream as part of Almaden's quality assurance and control program which complies with National Instrument 43-101 requirements.
The Ixtaca deposit is one of several exploration targets on the wholly owned Tuligtic property. The 14,000 hectare Tuligtic claim covers an area of high level epithermal clay alteration. The project area is partially covered by volcanic ash deposits which mask underlying alteration, potential vein zones and associated soil responses. In areas devoid of this covering ash, soil sampling has defined several distinct zones of elevated gold and silver values and trace elements typically associated with epithermal vein systems.
The Ixtaca zone is one of the largest areas of gold/silver soil response but it is also one of the areas with the least ash cover on the project. Management believes that the other altered and geochemically anomalous areas could represent additional zones of underlying quartz-carbonate epithermal veining like the Ixtaca zone. In 2014 the Company anticipates redirecting drilling efforts to the exploration of high priority epithermal targets outside of the
The potential quantity and grade of these exploration targets is conceptual in nature. There has been insufficient exploration and/or study to define these exploration targets as a Mineral Resource. It is uncertain if additional exploration will result in these exploration targets being delineated as a Mineral Resource. The potential quantity and grade of these exploration targets has not been used in the PEA update.
Cautionary Note concerning estimates of Measured, Indicated and Inferred Mineral Resources This news release uses terms that comply with reporting standards in
These standards differ significantly from the requirements of the
This news release uses the terms 'measured mineral resources', 'indicated mineral resources' and 'inferred mineral resources' to comply with reporting standards in
These terms have a great amount of uncertainty as to their existence, and great uncertainty as to their economic and legal feasibility. Therefore,
In accordance with Canadian rules, estimates of 'inferred mineral resources' cannot form the basis of pre-feasibility or other economic studies. It cannot be assumed that all or any part of the 'measured mineral resources', 'indicated mineral resources' or 'inferred mineral resources' will ever be upgraded to a higher category.
Almaden is a well-financed mineral exploration company working in
Uniquely, the Company has pioneered a new geologic and mineral district in
Almaden's business model has been to find and acquire mineral properties and develop them by seeking option agreements with others who can acquire an interest in a project by making payments and exploration expenditures. Through this means the company has been able to expose its shareholders to discovery and capital gain without the funding and consequent share dilution that would be required if the company were to have developed these projects without a partner.
The company intends to expand this business model, described by some as prospect generation, by more aggressively exploring, developing and advancing its projects including the
Except for the statements of historical fact contained herein, certain information presented constitutes 'forward-looking statements' within the meaning of the United States Private Securities Litigation Reform Act of 1995 and Canadian securities laws.
Such forward-looking statements, including but not limited to, those with respect to potential expansion of mineralization, potential size of mineralized zone, and size and timing of exploration and development programs, estimated project capital and other project costs and the timing of submission and receipt and availability of regulatory approvals involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievement of Almaden to be materially different from any future results, performance or achievements expressed or implied by such forward-looking statements.
Such factors include, among others, risks related to international operations and joint ventures, the actual results of current exploration activities, conclusions of economic evaluations, uncertainty in the estimation of mineral resources, changes in project parameters as plans continue to be refined, environmental risks and hazards, increased infrastructure and/or operating costs, labour and employment matters, and government regulation and permitting requirements as well as those factors discussed in the section entitled 'Risk Factors' in Almaden's Annual Information form and Almaden's latest Form 20-F on file with the
Although Almaden has attempted to identify important factors that could cause actual results to differ materially, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate as actual results and future events could differ materially from those anticipated in such statements.
Almaden disclaims any intention or obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, other than as required pursuant to applicable securities laws. Accordingly, readers should not place undue reliance on forward-looking statements.
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