Exhibit 99.1

AURICO GOLD AND NORTHGATE MINERALS PROVIDE UPDATE ON

SPECIAL SHAREHOLDER MEETINGS

TORONTO, Ontario (September 13, 2011) – AuRico Gold Inc. (“AuRico”) (TSX:AUQ) (NYSE:AUQ) and Northgate Minerals Corporation (“Northgate”) (TSX:NGX) (NYSE-Amex:NXG) jointly announce that pursuant to the New York Stock Exchange’s advance notice requirement for setting record dates, the record date for the notice of the AuRico Meeting and the Northgate Meeting (as defined below) has now been set for September 23, 2011. Consistent with the change in the record date, the date of both companies’ special meetings of shareholders has now been set for October 24, 2011.

The purpose of the AuRico special meeting (“AuRico Meeting”) is to consider a resolution to approve the issuance of the AuRico common shares to Northgate security holders in connection with the Arrangement (as hereinafter defined). The AuRico Meeting is being held concurrently with the special meeting of Northgate shareholders (“Northgate Meeting”) which has been called to consider the Arrangement.

AuRico shareholders of record at the close of business on September 23, 2011 will be provided with the notice of the AuRico Meeting and AuRico’s management information circular in respect of the AuRico Meeting and will be entitled to vote at the AuRico Meeting.

Northgate shareholders of record at the close of business on September 23, 2011 will be provided with the notice of the Northgate Meeting and Northgate’s management information circular in respect of the Northgate Meeting and will be entitled to vote at the Northgate Meeting.

Both companies’ information circulars will be publically filed and mailed during the week of September 26, 2011.

On August 29, 2011, AuRico and Northgate announced that the companies had entered into an arrangement agreement (the “Arrangement Agreement”), pursuant to which, among other things, AuRico will acquire all of the issued and outstanding common shares of Northgate in accordance with a court-approved plan of arrangement of Northgate under the British Columbia Business Corporations Act (the “Arrangement”). Assuming the Arrangement becomes effective, each Northgate shareholder will receive 0.365 of an AuRico common share for each Northgate common share.

About AuRico Gold:

AuRico Gold is a leading intermediate Canadian gold and silver producer with a diversified portfolio of high quality mines and projects in Mexico. The Company’s three wholly-owned operating properties include the Ocampo mine in Chihuahua State, the El Chanate mine in Sonora State and the El Cubo mine in Guanajuato State. A strong pipeline of development and exploration stage projects include the Guadalupe y Calvo advanced development property in Chihuahua State and the Orion advanced development property in Nayarit State, along with six exploration properties throughout Mexico. AuRico’s head office is located in Toronto, Ontario, Canada.

About Northgate Minerals:

Northgate Minerals Corporation is a gold and copper producer with mining operations, development projects and exploration properties in the Americas and Australia. Northgate currently owns and operates the Fosterville and Stawell gold mines in Victoria Australia, and is building the Young-Davidson gold mine in northern Ontario, which is targeting a 15-year mine life with average annual production of 180,000 ounces of gold commencing in 2012.

For further information please visit our websites at http://www.auricogold.com and http://www.northgateminerals.com or contact:

AuRico Gold

Anne Day

Director of Investor Relations

647-260-8880

Northgate Minerals

Keren R. Yun

Director of Investor Relations

416-216-2781

Cautionary Statement

Cautionary Note to US Investors – The United States Securities and Exchange Commission (the “SEC”) permits US mining companies, in their filings with the SEC, to disclose only those mineral deposits that a company can economically and legally extract or produce. This press release uses certain terms, such as “measured”, “indicated” and “inferred” “resources”, that the SEC guidelines strictly prohibit US registered companies from including in their filings with the SEC. US investors are urged to consider closely the disclosure in AuRico’s Annual Report on Form 40-F, which may be secured from AuRico or from the SEC’s website at http://www.sec.gov.

No stock exchange, securities commission or other regulatory authority has approved or disapproved the information contained herein.

Certain statements included herein, including information as to the future financial or operating performance of AuRico or Northgate, their respective subsidiaries and their respective projects, constitute forward-looking statements. The words “believe”, “expect”, “anticipate”, “target”, “continue”, “estimate”, “may”, and similar expressions identify forward-looking statements. Forward-looking statements include, among other things, statements regarding anticipated future financial and operational performance, the future price of gold and silver and the ratio of their prices, the de-risking of operations, future exploration results of its exploration and development programs and the success of AuRico or Northgate’s exploration approaches, AuRico or Northgate’s ability to delineate additional resources and reserves as a result of such programs, statements regarding their respective financial exposure to litigation, targets, estimates and assumptions in respect of gold and silver production and prices, operating costs, results and capital expenditures, mineral reserves and mineral resources and anticipated grades, recovery rates, future financial or operating performance, margins, operating and exploration expenditures, costs and timing of completion of the Ocampo expansion program and improvements to the heap leach pad, costs and timing of the development and commencement of production of new deposits, costs and timing of construction, costs and timing of future exploration and reclamation expenses, including anticipated 2011 results, operating performance projections for 2011, AuRico or Northgate’s ability to fully fund their respective business model internally, 2011 gold and silver production and the cash and operating costs associated therewith, the ability to achieve productivity and operational efficiencies, and the timing of each thereof. Forward-looking statements are necessarily based upon a number of estimates and assumptions that, while considered reasonable by the Company, are inherently subject to significant business, economic, competitive, political and social uncertainties and contingencies. The operating and financial performance of the Company will be affected by changes in the actual gold equivalency ratio realized in 2011. Many factors could cause the Company’s actual results to differ materially from those expressed or implied in any forward-looking statements made by, or on behalf of, AuRico or Northgate. Such factors include, among others, known and unknown uncertainties and risks relating to additional funding requirements, reserve and resource estimates, commodity prices, hedging activities, exploration, development and operating risks, illegal miners, political and foreign risk, uninsurable risks, competition, limited mining operations, production risks, environmental regulation and liability, government regulation, currency fluctuations, recent losses and write-downs, restrictions in any of AuRico and Northgate’s loan facilities, dependence on key employees, possible variations of ore grade or recovery rates, failure of plant, equipment or process to operate as anticipated, accidents and labour disputes. Investors are cautioned that forward-looking statements are not guarantees of future performance and, accordingly, investors are cautioned not to put undue reliance on forward-looking statements due to the inherent uncertainty therein.

This news release shall not constitute an offer to sell or a solicitation of an offer to buy any securities, and shall not constitute an offer, solicitation or sale in any state or jurisdiction in which such an offer, solicitation or sale would be unlawful. The securities to be offered by AuRico have not been and will not be registered under the United States Securities Act of 1933, as amended (the “U.S. Securities Act”), or any state securities laws and may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the U.S. Securities Act. AuRico intends to offer and sell its securities in the United States pursuant to the exemption from registration set forth in Section 3(a)(10) of the U.S. Securities Act.

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Northgate Minerals CORP 6-K