KINGMAN, Ariz., June 4, 2013 /PRNewswire/ – Sierra Resource Group, Inc. (OTCBB: SIRG) (the “Company” or “Sierra”) announced today that it continues to make progress in its efforts to re-open the Chloride Copper Mine (the “Mine”). The Company awarded its Aquifer Protection Permit (“APP”) work with Arizona Department of Environmental Quality (“ADEQ”) to full-service engineering and construction firm CDM Smith ( www.cdmsmith.com ) in August 2012. Sierra has now also engaged CDM Smith for the work associated with its Air Quality Permit (pursuant to the Clean Air Act), as well as all electrical work associated with building of the substation and all the other electrical needs required to re-start mining operations.

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“CDM Smith has done a terrific job with our APP Permit and the ADEQ, and we felt they are supremely qualified and the right group to handle the Air Quality Permit as well as the needed electrical work,” said J. Rod Martin, Chief Executive Officer of Sierra.

Mr. Martin went on to say that CDM Smith’s expertise and commitment to continually improving environmental value and quality of life fits well with Sierra’s own commitment to operating responsibly and maintaining environmentally friendly policies while impacting the local economy in a positive manner that allow its shareholders to take pride in their investment.