VANCOUVER, Dec. 11, 2013 /PRNewswire/ – Sierra Iron Ore Corporation (Symbol: NAA-TSXV/OTCQX:SIOCF) (the “Company”) is pleased to announce that it has made significant advancements to support the Company’s plan for an exploration/development field work program on the the Mazomique iron ore property. The Mazomique property is the Company’s 2(nd) prospective optioned iron ore property that is expected to be in development. The Company’s El Creston property recently received final permit approval to start major construction.

The Company’s plan is to conduct a re-con prospecting and geological geo-physics program on the Mazomique property to analyze the iron ore potential of the exposed ore zones. The study will also include a scoping study.

The Mazomique iron ore property, similar to the nearby El Creston Iron property is ideally located geographically for the export of iron ore. The property is located approximately 100 kilometers from a major west coast port in Mexico. The highway infrastructure has recently been upgraded and the local roads to the property are now complete.

About Sierra Iron Ore

Sierra Iron Ore is a growth focused mineral exploration company creating value through the exploration and development of the El Creston property and the Mazomique Property located in the Sinaloa State/ Chihuahua states of Mexico. The company has Permit approval on the El Creston Property planning for immediate further property development. Roads have been built and upgraded as well as equipment has been mobilized for further developing the known magnetite zones identified by recent exploration work.

On June 18, 2012, the company announced that it has entered into an agreement (the “Mazomique Agreement”) with Aztec Zinc de Mexico S.A. de C.V. (the “Owner”), an arm’s-length party, to acquire up to an 80% interest in a highly prospective iron ore property (the “Mazomique Property”) comprising of one concession covering an area of 3,055.27 ha near the northeast boundary of Sinaloa and Chihuahua states

Sierra Iron Ore also has 100% ownership of the Tom Cat property which is located 200 kilometres east-northeast of Vancouver within the historic Aspen Grove copper camp. The company is currently conducting an exploration program of geological mapping and sampling program as a prelude to a planned diamond drill program.

On behalf of The Board of Directors of Sierra Iron Ore Corporation.

Wally Boguski, Director

Neither 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 press release, which has been prepared by management.

SOURCE Sierra Iron Ore Corporation

/CONTACT:

contact Corey Safran, Strategic Planning, at 609-228-0595, or by email at [email protected].