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

May 6, 2010

Government Report On St. Charles Rare Earths

In response to requests for more detail about rare earth minerals in the St. Charles deposit, Micrex has published a document produced by the Quebec government's Division of Industrial Minerals and Precious Metals. The document can be found on the St. Charles page of the company's web site at www.micrex.ca.

The report describes the sampling, tests and processes conducted by government geologists in 1987 - 1988 when they investigated methods to produce a concentrate of apatite from St Charles ore. The assay results from each stage of the procedure show that the concentration of rare earths increases in step with the concentration of apatite.

Ore samples were taken from two areas on the property, and each was subjected to a series of procedures that included grinding, magnetic separation and flotation.

The final concentrates from the two sample areas contained 40.7% to 42.1% P2O3 and 520 to 560 parts per million (ppm) Yttrium. Other rare earths were also present, and the total of all rare earths in the final concentrate was 2577 to 2775 ppm. It should be noted that the testing program in 1988 did not include tests for erbium (Er), which is the dominant rare earth found in core samples drilled elsewhere on the property. Micrex will include tests for erbium in future sampling programs.

Although the Company considers these test results to be reliable, readers are cautioned that no report on such has been done that would meet current NI 43-101 standards.

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.mixcorp.com

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