Category: Silver / Gold

Allied Nevada Announces Hycroft Mill Expansion Prefeasibility Study Results With 26.5% IRR(1) and $1.7 Billion NPV(1)

On-Site Oxidation and Staged Construction Schedule Reduce Construction and Operating Risks

RENO, NEVADA - Apr 22, 2014 - Allied Nevada Gold Corp. ("Allied Nevada", "we', "us", "our" or the "Company") (ANV.TO)(NYSE MKT:ANV) is pleased to provide a summary of the prefeasibility study results for the Hycroft mill expansion, completed by M3 Engineering and Technology ("M3") in association with the Company. M3 developed the process flow sheet, capital cost estimate, operating cost estimate and financial model, while Allied Nevada developed the mineral reserves and mine plan. The prefeasibility study assumes a two-phase construction plan for the mill expansion. With the successful completion and positive results of the Ambient Alkaline Oxidation ("AAO") pilot plant, we have incorporated the onsite oxidation of the sulfide concentrate into the prefeasibility study, which should allow us to produce doré on-site for sale (as compared with the previous plan of selling concentrate).

Key Highlights of the Prefeasibility Study

Results of the prefeasibility study, based on a $1,300 per ounce of gold price and a $21.67 per ounce of silver price, include the following:

  • Average annual production for the first five years of full production (2018-2022) of approximately 450,000 ounces of gold and 21.0 million ounces of silver (approximately 800,000 ounces gold equivalent(2))
  • Average adjusted cash costs per ounce(3) for the first five years of full production of $478 annually (with silver as a byproduct credit)
  • Mining and processing life of 20 years
  • Two phase construction schedule reduces construction risk and moderates capital spending program; 60,000 tons of ore per day ("tpd") capacity in Phase 1 and increasing to 120,000 tpd in Phase 2
  • Addition of on-site AAO circuit to oxidize and process sulfide concentrate to produce doré on-site
  • Phase 1 capital of $900 million(1) to deliver annual production of 550,000 ounces gold equivalent in 2017
  • Phase 2 capital of $422 million to increase average annual production to approximately 800,000 ounces gold equivalent beginning in 2018
  • Life-of-mine ("LOM") after tax internal rate of return ("IRR")(1) of 26.5%
  • LOM net present value ("NPV")(1) of $1.7 billion (at a 5% discount)

"I have stated repeatedly since joining Allied Nevada that I believe that the Hycroft mill expansion is a project that needs to be built," commented Randy Buffington, President and CEO. "There aren't many large projects today located in politically stable jurisdictions with complimentary infrastructure like this one. The ability to produce doré on-site using the AAO process is a significant step toward derisking the project. I believe this prefeasibility study addresses many of the risks associated with the previous plans, while maintaining robust financial returns."

The following summarizes LOM assumptions for the mill expansion project:

Total tons of ore processed (000s)   934,020
Grade - Au (ounces per ton)   0.011
Grade - Ag (ounces per ton)   0.50
Total gold ounces sold (000s)   7,366
Total silver ounces sold (000s)   328,606
Total gold equivalent ounces sold (000s)   12,843
Total revenue at $1,300/oz Au and $21.67/oz Ag (millions)   $16,696
Revenue per ton processed   $17.88
Mining cost per ton mined   $1.40
Milling cost per ton of ore milled (includes all treatment costs)   $8.83
Heap leach cost per ton of ore heap leached (includes crushing)   $2.53
G&A cost per ton of ore processed   $0.35
Nevada Net Proceeds Tax and refining cost per ton of ore processed   $0.45

Construction path

Based upon the prefeasibility study, construction of the full plant is designed and scheduled to be completed in two phases. Phase 1 of the mill construction is expected to include: one grinding line, comprised of one semi-autogenous ("SAG") mill and two ball mills and a regrind mill, capable of processing up to 60,000 tpd; sulfide flotation cells; tails leach tanks; oxidation tanks; an oxygen plant; starter tails capacity; and the associated infrastructure for these facilities. In Phase 1, the rail spur and power requirements are expected to be constructed. Current estimates assume that the oxygen plant will be constructed by a third party vendor, which is accounted for in operating costs. The flow sheet will be designed with three streams to process; (1) whole ore; (2) sulfide with the AAO plant; or (3) transitional material with the AAO circuit and a tails leach plant. Our projections are based on construction of Phase 1 commencing in the last quarter of 2014, which is dependent on our ability to secure the necessary financing. Phase 1 is scheduled to be completed within 24 months, which would result in commissioning in the last quarter of 2016.

Upon successful commissioning of Phase 1 of the mill expansion, we intend to begin construction of Phase 2. Phase 2 is designed to increase the mill capacity to 120,000 tpd by adding a second grinding line, comprised of an additional SAG mill and two additional ball mills, additional flotation cells and additional tanks for the AAO circuit commensurate with the increased capacity of the grinding circuit. Under the prefeasibility study, construction of Phase 2 is currently projected to begin commissioning in the last quarter of 2017.

    PHASE 1   PHASE 2
Expansion includes: - Mill infrastructure - 1 x SAG mill
  - 1 x SAG mill - 2 x Ball mills
  - 2 x Ball mills - Increased flotation capacity
  - Partial flotation circuit - Additional tanks for AAO and tails leach circuits
  - Partial AAO circuit    
  - Oxygen plant (over the fence)    
  - Tails leach plant    
  - Rail spur and trona handling    
  - Power line    
  - Tails impoundment    

Flow Sheet Description and Significant Changes

Mining initially will be conducted using the existing fleet of mining equipment at Hycroft. Between 2017 and 2025 we expect to add two additional wire rope shovels and 19 haul trucks. The current crushing circuit will act as the primary crusher for the mill, with the secondary and tertiary crushers being used for pre-crushing and pebble crushing, respectively.

The major components of the milling facility are crushing (existing), grinding, flotation, oxidation, tails leach and Merrill-Crowe (existing). Significant changes to the flow sheet include the elimination of cleaner flotation and the autoclave facility and the addition of a fourth ball mill, AAO circuit, oxygen plant and tails leach plant. We anticipate adding a high-grade filter press and additional refinery capacity to the existing Merrill-Crowe plant to process the increase in production from the sulfide mill.

The current mill design is expected to have three stream capabilities, including:

  1. Mill Stream 1 (Whole ore leach) - highly oxidized transitional ore is ground and leached in the tails leach plant.
  2. Mill Stream 2 (Sulfide processing) - sulfidic ore is ground and floated to create a concentrate. The concentrate is oxidized through the AAO plant and leached to extract the gold and silver.
  3. Mill Stream 3 (Partially oxidized transition processing) - transition material that is partially oxidized is ground and floated to create a concentrate. The concentrate is oxidized and leached, while the remaining material that does not float (the flotation tails) is leached directly.

Average recovery rates vary depending on the process stream. LOM average recoveries are projected to be as follows:

  Contained Ounces   Recovered Ounces   Recovery (%)   Contained Ounces   Recovered Ounces   Recovery (%)
Heap Leach:                      
- Run-of-mine 1,695,600   929,373   54.8   61,559,646   8,681,552   14.1
- Crushed 334,456   238,776   71.4   13,612,611   3,004,196   22.1
Mill stream 1 836,646   556,804   66.6   35,563,100   26,969,509   75.8
Mill stream 2 6,552,751   4,678,108   71.4   259,717,083   208,878,702   80.4
Mill stream 3 1,009,395   741,827   73.5   93,343,558   83,948,674   89.9
TOTAL 10,428,847   7,144,887   68.5   463,795,999   331,482,633   71.5

Economic Analysis

As noted above, the results of the revised prefeasibility study indicate an IRR projected to be 26.5% and a NPV projected to be $1.7 billion at a discount rate of 5%, assuming gold and silver prices of $1,300 per ounce and $21.67 per ounce, respectively and based on additional assumptions set forth in the table titled "Assumptions used in the prefeasibility study estimate" at the end of this press release. The initial capital to construct the mill and associated infrastructure is on a go-forward basis and does not include capital spent to date on the mill expansion such as mills and motors, crushing and excavation. The cash flow model considers the current heap leach revenue and costs as part of the project. The capital estimate to construct the mill in two phases is presented in the following table.

  PHASE 1   PHASE 2   Total
  millions   millions   millions
Direct costs $525.4   $276.2   $801.6
Indirect costs (includes contingency) $262.9   $138.3   $401.1
Owners cost $111.8   $7.4   $119.2
Total capital $900.1   $421.9   $1,322.0

The Hycroft mill expansion is projected to generate a significant amount of gold and silver at relatively low adjusted cash costs per ounce(3). The project, however, is extremely sensitive to metal prices. The following table illustrates the sensitivity to changes to the calculated IRR and NPV(1) at 0% and 5% discount rates at various gold and silver prices and based on a constant ratio of the silver price to the gold price of 60:1. Additional sensitivity would result from changes to this ratio.

Metal Prices   After tax NPV (0%)   After tax NPV (5%)   After tax IRR
Au   Ag   Billions   Billions   %
$1,200   $20.00   $2.3   $1.1   17.5
$1,300   $21.67   $3.2   $1.7   26.5
$1,400   $23.33   $4.0   $2.2   36.8

Next Steps

The Board of Directors has reviewed the results of the prefeasibility study and approved moving forward with completing the feasibility study. M3 is expected to complete the feasibility study by the end of the third quarter.


We have retained Credit Suisse Securities (USA) LLC and expect to retain Scotia Capital Inc. to advise us and execute on financing and/or investment options for the mill expansion capital requirements.

Mineral Reserve and Resource Update

The revised prefeasibility study was based on the Proven and Probable Mineral Reserves estimated at December 31, 2013, as updated to reflect the new mine plan and for the economics of the study, of 10.6 million ounces of gold and 467.1 million ounces of silver. Proven and Probable Mineral Reserves were calculated using a $1,200 per ounce gold price and a $20 per ounce silver price.

Conference Call Information

We will host a conference call and webcast on April 23, 2014, at 8:00 am PT, to discuss the revised prefeasibility study. The listen-only webcast can be accessed from the home page of our website at To dial-in to the conference call and participate in the questions and answer session, please dial:

North America toll‐free - 1‐866-782-8903

Outside of North America - 1‐647-426-1845

An audio recording of the call will be archived on our website at

Assumptions used in the prefeasibility study estimate:

Parameter   Assumption   Description
Mining years   17 years   150 million tons per year ("mtpy") by 2017, 200 mtpy by 2025
Processing years   20 years   Last 3 years are from stockiles
Inflation   None - real basis   All projected revenue and costs were assumed to be in January 1, 2014 real terms, with no inflation applied.
Starting basis   January 1, 2014 go-forward   All economic analyses were done on a January 1, 2014, "go-forward" basis.
Capital structure   Unlevered   No debt financing or interest payments were assumed.
Discount rate   5% real   All the NPVs shown in this report were calculated using a discount rate of 5%. Sensitivity analysis has been completed for 0% and 10% discount rates.
Metal prices (base case)   $1,300/oz Au, $21.67/oz Ag (60:1)   Commodity prices were assumed to be constant over the DCF timeframe.
Refining charge   $ 0.75 per Au and Ag oz   Applied a refining charge of
$ 0.50/oz and a deleterious elements charge of $0.25/oz.
Melt loss   -0.5% Au and Ag   Applied to account for melt losses during the refining process.
Payable metal   99.9% Au and 99.0% Ag   Assumptions to arrive at payable metal are based on the current contract with Johnson Matthey.

Summary of updated mine plan and assumed economics:

        First 5 Years Average
  Life of Project Average
  LOM Totals
Production Information:                
Total tons of ore processed - heap leach   (000's)   11,070   8,342   225,934
Tons of ore processed - mill   (000's)   43,680   43,750   708,085
Tons of waste mined   (000's)   88,938   98,100   1,454,192
Total tons   (000's)   143,688   150,192   2,388,212
Contained gold       615,094   610,151   10,428,847
Contained silver       27,620,521   27,144,492   463,795,999
Ounces sold - gold       449,413   438,040   7,366,306
Ounces sold - silver       21,022,341   21,247,041   328,605,552
Ounces sold - gold equivalent       799,786   792,157   12,843,065
Cash Flow Information:                
Cash inflows:                
Revenue from metal sales   ($ 000's)   1,039,722   1,029,805   16,695,985
Cash outflows:                
  Operating costs   ($ 000's)   670,241   637,105   11,173,832
  Income taxes   ($ 000's)   16,685   37,764   497,408
  Inventory adjustments   ($ 000's)   2,792   21,742   (263,593)
  Reclamation spending & salvage   ($ 000's)   -   -   77,413
  Capital spending   ($ 000's)   45,965   37,841   2,029,305
Total Cash Outflows   ($ 000's)   735,683   734,451   13,514,364
  Net Cash Flow   ($ 000's)   304,038   295,353   3,181,620
After-tax NPV @ 5%   ($ 000's)           1,681,985
After-tax NPV @ 10%   ($ 000's)           887,850
After-tax Internal Rate of Return   %           26.5
Adjusted cash costs(3)per gold ounce sold:                
  With silver as byproduct credit   ($ / Oz)   478   404   550
  Gold equivalent   ($ / Oz)   838   804   870
From a silver production and sales point of view:                
  Silver equivalent production (ounces Ag)       47,987,121   47,529,441   40,774,889
  Adjusted cash costs per ounce with gold as a byproduct credit ($/silver ounce sold)       $2   $1   $3

Metal selling prices used in determining the economics for the project were $1,300 per ounce of gold and $21.67 per ounce of silver. Gold equivalent is calculated using a 60:1 silver to gold ounce ratio.

No assurance or guarantee is provided that the calculated IRR or NPV values will be achieved. Actual results may differ materially.

Allied Nevada will file an NI 43-101 compliant Technical Report within the regulatory timeframe. Once filed the report will be available at or under the Company's profile at

Proven & Probable Mineral Reserves - December 31, 2013
    Tons   Grades   Contained Ounces (000s)
    (000s)   Au   Ag   AuEq   Au   Ag   AuEq
Proven Heap Leach   163,479   0.009   0.14   0.011   1,440   22,446   1,814
Probable Heap Leach   45,561   0.008   0.72   0.020   342   32,924   891
Total Proven & Probable Heap Leach   209,041   0.009   0.26   0.013   1,782   55,370   2,705
Proven Mill   593,559   0.012   0.57   0.022   7,144   340,823   12,825
Probable Mill   148,402   0.011   0.48   0.019   1,630   70,953   2,812
Total Proven & Probable Mill   741,960   0.012   0.55   0.021   8,774   411,776   15,980
TOTAL PROVEN & PROBABLE MINERAL RESERVES   951,001   0.011   0.49   0.019   10,556   467,146   18,342
Waste   1,444,275                        
Total Tons   2,395,276                        
Strip Ratio   1.52                        

For additional information on key assumptions, parameters and methods used to estimate the mineral reserves, including quality assurance measures and other technical information in respect of the Hycroft Mine, please refer to our technical report entitled "Technical Report - Allied Nevada Gold Corp. - Hycroft Mine, Winnemucca, Nevada, USA" and dated March 6, 2013. Allied Nevada expects to file an updated Technical Report within the regulatory timeframe required by National Instrument 43-101 requirements.

Cautionary Statement Regarding Forward Looking Information

This press release contains forward-looking statements within the meaning of Section 27A of the U.S. Securities Act of 1933, as amended (the "Securities Act"), Section 21E of the U.S. Securities Exchange Act of 1934, as amended (the "Exchange Act") (and the equivalent under Canadian securities laws) and the Private Securities Litigation Reform Act (the "PSLRA") or in releases made by the U.S. Securities and Exchange Commission (the "SEC"), all as may be amended from time to time. This cautionary statement is being made pursuant to the Securities Act, the Exchange Act and the PSLRA with the intention of obtaining the benefit of the "safe harbor" provisions of such laws. All statements, other than statements of historical fact, included herein or incorporated by reference, that address activities, events or developments that we expect or anticipate will or may occur in the future, are forward-looking statements. Generally, these forward-looking statements can be identified by the use of forward-looking terminology such as "estimate", "plan", "anticipate", "expect", "intend", "believe", "project", "target", "budget", "may", "can", "will", "would", "could", "should", "seeks", or "scheduled to", or other similar words, or negatives of these terms or other variations of these terms or comparable language or any discussion of strategy or intentions. Such forward-looking statements include, without limitation, statements regarding our future business strategy, plans and goals; future gold and silver prices; the timing of or expected results of the completed feasibility study; delays in processing gold and silver; the potential for confirming, upgrading and expanding gold and silver mineralized material at Hycroft; reserve and resource estimates and the timing of the release of updated estimates; estimates of gold and silver grades; future prices for gold and silver; recovery rates for gold and silver; anticipated operating, capital and construction costs, anticipated sales, project economics, net present values and expected rates of return; the realization of expansion and construction activities and the costs and timing thereof; availability and cost of financing; production estimates and other statements that are not historical facts. Forward-looking statements address activities, events or developments that Allied Nevada expects or anticipates will or may occur in the future, and are based on current expectations and assumptions.
These statements involve known and unknown risks, uncertainties, assumptions and other factors which may cause our actual results, performance or achievements to be materially different from any results, performance or achievements expressed or implied by such forward-looking statements. Important factors that could cause actual results, performance or achievements to differ materially from those in the forward-looking statements include, among others, risks that Allied Nevada's exploration and property advancement efforts will not be successful; risks relating to fluctuations in the price of gold and silver; an increase in the cost or timing of new projects; the inherently hazardous nature of mining-related activities; uncertainties concerning reserve, resource and grade estimates; uncertainties relating to obtaining approvals and permits from governmental regulatory authorities; and availability and timing of capital for financing the Company's exploration, development and expansion activities, including the uncertainty of being able to raise capital on favorable terms or at all; as well as those factors discussed in Allied Nevada's filings with the SEC including Allied Nevada's latest Annual Report on Form 10-K and its other SEC filings (and Canadian filings) including, without limitation, its latest Quarterly Report on Form 10-Q (which may be secured from us, either directly or from our website at or at the SEC website
Although Allied Nevada has attempted to identify important factors that could cause actual results, performance or achievements to differ materially from those described in forward-looking statements, there may be other factors that cause results, performance or achievements not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate, as actual results, performance and achievements and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. The Company does not intend to publicly update any forward-looking statements, whether as a result of new information, future events, or otherwise, except as may be required under applicable securities laws. The technical contents of this news release have been prepared under the supervision of Daniel Roth, Project Manager at M3 Engineering and Technology, and Tony Peterson, Corporate Mine Engineer at Allied Nevada Gold Corp., a Registered Professional Engineer in the State of Colorado #43867 who are Qualified Persons as defined by National Instrument 43-101. For further information regarding the quality assurance program and the quality control measures applied, as well as other relevant technical information, please see the Hycroft Technical Report which will be filed within the regulatory timeframe on

Cautionary Note to U.S. Investors - The United States Securities and Exchange Commission permits U.S. mining companies, in their filings with the SEC, to disclose only those mineral deposits that a company can economically and legally extract or produce. We use certain terms on this website (or press release), such as "measured," "indicated," and "inferred" "resources," which the SEC guidelines strictly prohibit U.S. registered companies from including in their filings with the SEC. U.S. Investors are urged to consider closely the disclosure in our Form 10-K which may be secured from our website or the SEC website at

Non-GAAP Measures - Adjusted cash costs per ounce is a non-GAAP financial measure, calculated on a per ounce of gold sold basis, and includes all direct and indirect operating cash costs related to the physical activities of producing gold, including mining, processing, cash portions of production costs written-down, third party refining expenses, on-site administrative and support costs, royalties, and mining production taxes, net of revenue earned from silver sales. Because we are a primary gold producer and our operations focus on maximizing profits and cash flows from the extraction and sale of gold, we believe that silver revenue is peripheral and not material to our key performance measures or our Hycroft Mine operating segment and, as such, adjusted cash costs per ounce is reduced by the benefit received from silver sales.

Adjusted cash costs per ounce provides management and investors with a further measure, in addition to conventional measures prepared in accordance with GAAP, to assess the performance of our mining operations and ability to generate cash flows over multiple periods from the sale of gold. Non-GAAP financial measures do not have any standardized meaning prescribed by GAAP and, therefore, may not be comparable to similar measures presented by other mining companies. Accordingly, the above measures are intended to provide additional information and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with GAAP.

(1)   All costs are on a go-forward basis and consider capital spent to date as sunk costs. Net Present Value ("NPV") and Internal Rate of Return ("IRR") are calculated using $1,300 per gold ounce and $21.67 per silver ounce and additional assumptions set forth in the table titled "Assumptions used in the prefeasibility study estimate" at the end of this press release. No assurance or guarantee is provided that the calculated IRR or NPV values will be achieved. Actual results may differ materially.
(2)   Gold equivalent values are calculated using a 60:1 silver to gold ratio.
(3)   The term "adjusted cash costs per ounce" is a non-GAAP financial measure. Non-GAAP financial measures do not have any standardized meaning prescribed by GAAP and, therefore, should not be considered in isolation or as a substitute for measures of performance prepared in accordance with GAAP. See the section at the end of this press release and in the most recently filed Annual Report on Form 10-K titled "Non-GAAP Financial Measures" for further information on adjusted cash costs per ounce.

Allied Nevada Gold Corp.
Randy Buffington
President & CEO
(775) 358-4455
Allied Nevada Gold Corp.
Tracey Thom
Vice President, Investor Relations
(775) 789-0119

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