MICREX DEVELOPMENT CORP.

A mineral exploration and development company operating in Canada and the United States

TSX Venture Exchange symbol "MIX"
SEC 12 g (3) Exemption 82-4281

For immediate release

August 10, 2007

Field Crew Mobilized to Bighorn Property

Micrex Development Corp. announced today that a field crew has been mobilized to the Bighorn Property in northern British Columbia.

The airborne geophysics completed in early 2007 revealed numerous anomalies covering a significant area. As reported in the July 2007 Press Release Micrex staked additional lands based on the geophysics.

APEX Geoscience will be following up on new targets as well as more detailed study of previously discovered areas of exploration potential within the 6200hectares (15,350acres) project area.

Because of the large area that must be covered this program will involve a 4 to 5 person exploration crew working with helicopter support.

The current exploration plan is to collect extensive stream silt and Heavy Mineral Concentrate samples across the property as part of a regional exploration package. This will be followed by rock sampling and prospecting to follow up specific magnetic and EM (Electro-Magnetic) anomalies indicated by the recent geophysics.

The crew will also conduct more sampling in and around the main Lawson vein and other previously discovered gold occurrences.

Mike Dufresne of Apex Geoscience, who is the Qualified Person on this Project, has reviewed this press release.

Further information may be obtained from Perry Meszaros or S.E. Marshall at (780) 448-0922
or email at mixinfo-1@mixcorp.com

Web site address: www.mixcorp.com

MICREX DEVELOPMENT CORP.

Peace River Diamond Property • Burmis Magnetite/Titanium Property • St. Charles de Bourget Magnetite/Titanium Property • Fort Steel Placer Property • Bighorn Gold Mine • Banks Gold Mine • Mount Royal Gold Mine • Deadwood Gold Mine • Sunburst Gold Property

THE TSX VENTURE EXCHANGE HAS NOT REVIEWED AND DOES NOT ACCEPT RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THIS RELEASE.

FORWARD LOOKING STATEMENTS

Certain statements in this news release are "forward-looking statements", which reflect management's expectations regarding its property and business operations. All statements other than statements of historical fact contained in this news release are forward-looking statements. Such forward-looking statements involve risks and uncertainties, as they reflect management's current beliefs and are based on information currently available to management. Actual results may differ materially from those anticipated in the statements made. The forward-looking statements are expressly qualified in their entirety by this cautionary statement. The forward-looking statements are made as of the date of this news release and Micrex assumes no obligation to update or revise them to reflect new events or circumstances except as expressly required by applicable securities law. Further information regarding the uncertainties and risks can be found in the disclosure documents filed by Micrex with the securities regulatory authorities, available at www.sedar.com.

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