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

June 1, 2011

St. Charles Heavy Media Production Planned

Micrex Development Corp. (TSX.V: MIX) announces an update on the St. Charles Québec Magnetite / Titanium / Apatite / Rare Earth / Vanadium deposit.

Previously Micrex announced that a large international company conducted assays on samples from the St. Charles deposit. In addition to the magnetite, titanium, apatite and rare earths, those press releases advised that vanadium yielded 0.4%. Another very large company asked Micrex to reconfirm the rare earths in the deposit through the Saskatchewan Research Council in Saskatoon. This was done and all previous results have been re-confirmed.

Micrex has been offering magnetite crushed to ¼ inch for use as an aggregate in applications such as heavy concrete, but the market demand for powdered magnetite (called heavy media) is proving to be much greater. Although heavy media production requires more processing than the crushed product, the equipment to grind the rock to the requirements of heavy media customers is readily available.

An additional benefit of the grinding process is that secondary minerals such as titanium and apatite are released from the rock matrix, and can be separated from the magnetite. This results in the creation of additional products, the value of which is greater than the value of the heavy media alone.

In view of the increased revenue potential that will ensue from heavy media production, the Micrex board of directors has decided to offer the finely ground material to its customers. The Company has been negotiating with several organizations who are seeking to acquire heavy media, and expects to announce a successful conclusion of these negotiations in the very near future.

Micrex Development Corp. (TSX.V: MIX) is a mineral exploration company based in Alberta, Canada with mining properties in North America. Current focus is on the St. Charles de Bourget magnetite / titanium / apatite / rare earth / vanadium property in Québec.

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