Exhibit 99.1

Allied Nevada Announces Second Quarter 2013 Net Income of $4.2 Million or $0.04 Per Share

Announces Deferral of Hycroft Mill Construction to Evaluate

Potential Flowsheet Improvements and Complete a Revised Feasibility Study

August 6, 2013 | Reno, Nevada – Allied Nevada Gold Corp. (“Allied Nevada”, the “Company”, “we”, “our”, or “us”) (TSX: ANV; NYSE MKT:ANV) provides financial and operating results for the three and six months ended June 30, 2013. The results presented in this press release should be read in conjunction with the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2013, filed on SEDAR and EDGAR and posted on Allied Nevada’s website at www.alliednevada.com. The financial results are based on United States GAAP (with the exception of the non-GAAP financial measure “adjusted cash costs per ounce”) and are expressed in U.S. dollars.

While we remain confident in the operations team to deliver on the heap leach plan, it has not yet occurred and cash flow from operations remains weak, partly resulting from the sharp gold and silver price declines during the second quarter. These factors, as well as encouraging information on concentrate oxidation from our ongoing metallurgical program, have led to our decision to defer the construction of the mill at Hycroft until a revised feasibility study is completed. We will continue to work on optimizing the milling plan as well as finalizing the environmental permits necessary to operate the mill.

The concentrate oxidation work which has been ongoing for several months has focused on oxidizing sulfide concentrate on-site. We believe that this test work is leading us to an economical method of producing doré on-site. When we first began exploring the potential for a milling scenario for Hycroft, we reviewed conventional oxidation processes, such as autoclaving and roasting. These plans also included concentrate sales to reduce capital spending. While these plans showed positive returns, we continued to review other forms of oxidation with the goal of improving the economics of the project. The first success came from a detailed study of the viability of the BIOX process (“BIOX”). The results of this research revealed that Hycroft concentrate is highly amenable to oxidation and that low oxidation rates yield recoveries of gold and silver in concentrate in the 90% range. This new information led us to evaluate other lower cost conventional methods to treat concentrate on-site, such as chlorination, fine-grind high-intensity cyanidation and ambient pressure alkaline oxidation. All three, along with BIOX, have shown promising results. Results to date have led us to focus on the latter method: ambient pressure alkaline oxidation. Utilization of onsite oxidation will involve reassessment of the flowsheet and will likely result in a significantly simplified mill scenario. A full report on this metallurgical research will be made available once completed. To properly assess the benefits of this opportunity, a third party feasibility study will be undertaken once the metallurgical testing is completed, taking advantage of the engineering work completed and equipment purchased to date.

As a result of the decision to defer construction of the mill and to focus on completing optimization of the mill plan, we cannot estimate at this time a revised time frame, scope, or capital cost for different mill scenarios or revised long-term projections and estimates of production. We expect to make a decision on when the mill construction will be resumed once a new feasibility study is completed.

As a heap leach only operation, we expect to be able to mine existing heap leach reserves of approximately 2.0 million ounces of gold and 84.3 million ounces of silver for six years (starting in 2014) and process at a reduced rate through 2021. The average mining rate is expected to be 81.2 million total tons, including 33.5 million ore tons processed per year. Production is expected to average 225,000 ounces of gold and 2.7 million ounces of silver annually, through 2020, assuming heap leach operations only. We have additional heap leach mineralized material and the deposit remains open to the south with the potential for further expansion.

“I want to reiterate, we have done an exceptional amount of work in the past few months to identify and mitigate issues at Hycroft and have ensured the right people and plans are in place so that these issues do not continue,” commented Randy Buffington. “Sound operational performance is imperative and is the foundation of our business plans going forward. We have ample loading and hauling capacity, significant processing infrastructure coming online and a dedicated operating team in place. Postponing the mill build until we have a plan that we believe is the best for this deposit is a prudent decision at this juncture. This is a world-class, multimillion ounce, low-cost deposit located in the right jurisdiction and I am confident that this is a project that will be built.”

Q2 2013 Highlights

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Hycroft Operations Update

Key operating statistics for the three and six months ended June 30, 2013, compared with the same periods in 2012, are as follows:

Hycroft had no lost time accidents or significant environmental incidents in the first half of 2013. As of July 31, 2013, Hycroft had achieved 577 days without a lost time accident. By the end of July 2013, the projects group, including all contractors associated with the expansion, had surpassed a full year without a lost time incident.

In the second quarter of 2013, we mined and placed 9.8 million tons of ore on the leach pads at average grades of 0.01 ounces per ton gold and 0.23 ounces per ton silver.

Gold production from Hycroft increased 28% in the second quarter of 2013 compared with the second quarter of 2012, benefitting from the heap leach expansion. Silver production decreased 36% in the second quarter of 2013 as compared with the same period in 2012, primarily due to the increased usage of the carbon columns which are not as efficient at extracting silver from pregnant solution as the Merrill-Crowe system is. We expect that, with the new Merrill-Crowe plant coming online in the third quarter, silver production will increase through the remainder of the year. Sales in the second quarter of 2013 surpassed that of the same period in 2012 by 134% for gold and decreased 16% for silver.

Production and sales in the first half of 2013 did not meet guidance primarily as a result of metals not being released from the Lewis leach pad as expected. We have determined that a significant portion of the ore placed on the Lewis leach pad in late 2012 and early 2013, when the mining rate was increasing significantly, has not been properly leached due to insufficient solution application. We have begun a program to remediate the Lewis leach pad, and have completed the first step by identifying dry areas through drilling and geophysics. Drilling and metallurgical data obtained is being used to design a program that will introduce process solutions directly into these dry areas. We expect to receive permits in August to allow us to increase solution flow to the pads. It is anticipated that we will begin to see incremental production increases from the Lewis leach pad in the fourth quarter of 2013.

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When compared to the second quarter of 2012, our second quarter 2013 adjusted cash costs per ounce¹ were 47% higher due to the additional drilling, lime and cyanide costs associated with the Lewis leach pad remediation; reduced silver by-product revenue; increased maintenance costs for older loading equipment; and inefficient utilization of the mobile fleet. Now that we have the two wire rope shovels in operation, we plan on phasing out the hydraulic shovels from mine operations. In addition to reducing usage of more costly loading equipment, the recently completed mobile fleet dispatch system is expected to improve efficiencies and reduce costs over time. In July, in order to realign staffing needs with our revised operations outlook, we reduced the workforce at our Hycroft Mine by approximately 24%.

“These numbers are yet again below our earlier expectations, which has resulted in our making some very difficult decisions regarding our people,” commented Randy. “The workforce is the foundation of our business, however, we believe these choices will make for a more efficient operation and are crucial to our ability to adjust the Company cost structure so that we have the resources to drive future profitable growth.”

Operations Outlook

In 2013, we expect to sell approximately 175,000 to 200,000 ounces of gold and 0.9 million to 1.1 million ounces of silver. We expect to move 76.3 million tons of material, including 41.0 million tons of ore at average grades of 0.012 oz/ton gold and 0.25 oz/ton silver. The overall strip ratio for 2013 is expected to be 0.6:1.

A number of critical projects must be completed to achieve the higher end of the stated guidance range of metal sales. The stated guidance assumes there will be no material delays in the start-up of the new Merrill-Crowe facility. Adjusted cash costs per ounce¹ for 2013 are now expected to be in the range of $800 to $825 (with silver as a byproduct credit), which is an increase from our previously expected guidance range of $665-$685 per ounce, resulting from the issues stated above.

Allied Nevada intends to focus its resources towards the Hycroft operations and expansion. At this time, no further exploration drilling is planned for 2013. Permitting activities will continue for the Hasbrouck project.

Conference Call Information

Allied Nevada will host a conference call to discuss second quarter results on August 6, 2013, at 8:00 am PT (11:00 am ET) followed by a question and answer session.

To access the call, please dial:

Canada & US toll-free – 1-800-814-0445

Outside of Canada & US – 1-416-644-3415

Replay (available until August 20, 2013):

Access code: 4631412#

Canada & US toll-free – 1-877-289-8525

Outside of Canada & US – 1-416-640-1917

An audio recording of the call will be archived on our website at www.alliednevada.com.

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For further information on Allied Nevada, please contact:

or visit the Allied Nevada website at www.alliednevada.com.

Cautionary Statement Regarding Forward Looking Information

This press release contains forward-looking statements within the meaning of the U.S. Securities Act of 1933, the U.S. Securities Exchange Act of 1934 (and the equivalent under Canadian securities laws) and the Private Securities Litigation Reform Act, that are intended to be covered by the safe harbor created by such sections. Statements that are not historical fact are forward-looking statements. Forward-looking statements can be identified by, among other things, the use of forward-looking language, such as the words “plan,” “believe,” “expect,” “anticipate,” “intend,” “estimate,” “project,” “may,” “will,” “would,” “could,” “should,” “seeks,” or “scheduled to,” or other similar words, or the negative of these terms or other variations of these terms or comparable language, or by discussion of strategy or intentions. Such forward-looking statements include, without limitation, statements regarding 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; anticipated costs, project economics, the realization of expansion and construction activities and the timing thereof 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. Although Allied Nevada management believes that its expectations are based on reasonable assumptions, it can give no assurance that these expectations will prove correct. Important factors that could cause actual results 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; the inherently hazardous nature of mining-related activities; uncertainties concerning reserve and resource estimates; uncertainties relating to obtaining approvals and permits from governmental regulatory authorities; and availability and timing of capital for financing the Company’s exploration and development 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 U.S. Securities and Exchange Commission (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 www.alliednevada.com or at the SEC website www.sec.gov). 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 Don Harris, a Certified Professional Geologist with American Institute of Professional Geologists (A.I.P.G.), #10819, who is Director of Exploration for Allied Nevada Gold Corp. and is a Qualified Person as defined by National Instrument 43-101. For further information regarding technical information in relation to the Hycroft property, please see the Technical Report titled “Technical Report, Allied Nevada Gold Corp. Hycroft Mine, Winnemucca, Nevada, USA” dated March 6, 2013, available on www.sedar.com or on the Company’s website.

Non-GAAP Financial 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, third party refining expenses, on-site administrative and support costs, royalties, and mining production taxes, net of by-product revenue earned 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. 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.

The table below presents a reconciliation between non-GAAP adjusted cash costs, which is the numerator used to calculated non-GAAP adjusted cash costs per ounce, to cost of sales (GAAP) for the three and six months ended June 30, 2013 and 2012 (in thousands, except ounces sold):

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ALLIED NEVADA GOLD CORP.

CONDENSED CONSOLIDATED BALANCE SHEETS

(US dollars in thousands)

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ALLIED NEVADA GOLD CORP.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited)

(US dollars in thousands, except per share amounts)

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ALLIED NEVADA GOLD CORP.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

(US dollars in thousands)

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