Source: Erdene Resource Development Corp.                         Date: 09 June, 2011

Erdene Resource Development Corp. has reported an updated National Instrument 43-101 compliant resource estimate for the Company's Zuun Mod molybdenum-copper project. The new resource estimate was prepared following 4,331 meters of additional drilling completed in late 2010. "We are very pleased with the results of the new resource estimate for Zuun Mod which has exceeded our initial expectations and increased the size, grade, and our confidence in this significant resource", stated Mr. Peter Akerley, President and CEO. "In addition, the 2011 drilling has identified a new high-grade zone at depth, which is expected to enhance the value of the project."

The highlights of the updated estimate include:

§     Measured and Indicated resources increase by 38 million tons or 21% to 218 million tons

§     Contained molybdenum metal in the Measured and Indicated resource increase by 27% from 215 million pounds to 274 million pounds

§     Contained copper metal in the Measured and Indicated resource increased by 30% from 255 million pounds to 331 million pounds

§     The average grade for the Measured and Indicated resources increased 5.6% for molybdenum and 7.8% for copper, to 0.057% molybdenum and 0.069% copper.