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

April 20, 2010

Rare Earth Mineral Results from St. Charles Ore Body

Micrex Development Corp. (“Micrex” or the “Company”) announces that it has received new analyses from core samples from its St. Charles magnetite deposit that were drilled several years ago. The new analyses were conducted by Loring Laboratories in Calgary, and this time the samples were tested for several rare earth elements in addition to the more common major and trace elements that were previously tested. The analyses confirm the presence of total rare earth elements averaging 22,910 parts per million (ppm) or 2.29 weight percent (wt%) from hole 99-04 over its length of 105 meters, and 15,396 ppm (1.54wt%) from hole 99-06 over its length of 82.7 meters.

The concentrations of total rare earth elements were primarily comprised of erbium oxide (Er2O3), which averaged 20,284 ppm (2.03wt%) from hole 99-04 and 13,346 ppm (1.33wt%) from hole 99-06, along with lesser but anomalous amounts of cerium oxide (CeO2) and neodymium oxide (Nd2O3). Tests for erbium and the other rare earth elements had not been conducted during previous analyses, so this is a new addition to the Company’s interest in the value of the deposit. Erbium is used primarily in metallurgical applications, coloured glass and communication lasers.

It should be noted that concentrations of uranium and thorium are very low in most of the samples (less than 1 ppm), which is much less than most other rare earth deposits. Full details of the analyses can be viewed on the Micrex web site at www.mixcorp.com.

A total of 6 holes were drilled in 1999, and Micrex will be analyzing the other 4 for rare earths and vanadium in the near future.

Micrex also plans to conduct a program of surface sampling to determine the distribution and concentration of vanadium and rare earth minerals in other areas of the deposit.

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