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

March 24, 2010

Rare Earth Minerals and Vanadium in St. Charles Ore Body

Micrex announces that in light of recent market interest in rare earth minerals, and their anticipated increase in value as a result of the tightening of world supplies and increasing industrial demands, it is re-evaluating its St. Charles deposit in Quebec, Canada. Historically, the value of the St. Charles property has been based upon the assumption that it is primarily a magnetite deposit containing secondary minerals such as ilmenite and apatite.

Micrex recently received assays for samples of the St. Charles magnetite rich material conducted by a potential customer that revealed concentrations of vanadium oxide (V2O5) assaying 0.42%, as well as iron (Fe) assaying up to 57.44% and titanium dioxide (TiO2) assaying up to 45.13%. A report prepared in 1988 by the Centre de Recherches Minérals in Sainte-Foy, Quebec indicated that magnetite rich rock from the St. Charles deposit also contains the presence of rare earth elements associated with apatite.

Historic drilling has shown a rich section in the deposit containing 25% apatite and assaying 10% to 15% P2O5 over a 200 ft. section. Pilot plant testing of that zone produced concentrated apatite (up to 42%) containing total rare earth element levels of 2,600 parts per million (ppm) and 2,800 ppm (0.26% and 0.28%). The rare earth elements identified to date are primarily yttrium, cerium, neodymium, lanthanum, samarium and europium.

Although the Company considers these historical assay results and pilot plant tests to be reliable, readers are cautioned that a report that would meet current NI 43-101 standards that documents and confirms these historic results has not been constructed.

In addition to a program of further sampling, Micrex plans to immediately re-analyze existing core samples to determine the distribution and concentration of phosphorus, titanium, vanadium, other trace metals and rare earth elements.

This press release has been reviewed by Mr. Michael Dufresne, M.Sc., P.Geol. a principal of APEX Geoscience Ltd. and the Company's Qualified Person for this project under the meaning of NI 43-101.

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.micrex.ca

MICREX DEVELOPMENT CORP.

Burmis Magnetite/Titanium Property - St. Charles de Bourget Magnetite/Titanium/Rare Earth Property - Fort Steel Placer Property - Bighorn Gold Mine - Banks Gold Mine - Mount Royal Gold Mine - Deadwood Gold Mine - Sunburst Gold Property

NEITHER THE TSX VENTURE EXCHANGE NOR ITS REGULATION SERVICE PROVIDER (AS THAT TERM IS DEFINED IN THE POLICIES OF THE TSX VENTURE EXCHANGE) ACCEPTS 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