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

September 13, 2011

Update on Projects, New Director

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

Micrex is pleased to announce the completion of the NI 43-101 report on its St. Charles, Québec deposit which is now available on Sedar. The report states that even though 72 holes were drilled, and all showed uninterrupted magnetite throughout their length, that their spacing does not meet current requirements for calculating reserves. However, reserves should be readily proven up with an additional small drilling program. A high definition magnetometer survey is currently being conducted, with a report expected in the next two weeks.

Micrex's geologist, Réjean Girard, and Roch Cormier, vice-president of Micrex, met with Corem (Consortium de recherche appliquée en traitement et transformation des substances minérales) in Québec City last week to establish guidelines for laboratory testing of material from St. Charles. A small 500 kg sample will be initially tested, which will be followed with a full 100 ton test run, in order to determine the grinding characteristics and power requirements to process the magnetite. Also, a large sample is being shipped to Newcastle, England to aid in the final design of the grinding equipment for the plant.

Update on Deadwood Mine in New Mexico

This is a former gold and silver mine consisting of two patented claims, each 1,500 feet long. An updated technical report is expected in the next week and will be reported on at that time.

New Director

At the Company's recent annual general meeting, Greg Doll, of Edmonton, Alberta was elected as a director. Greg has been in the marketing business in Edmonton for the past 30 years and a long time shareholder of Micrex.

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