Platinex/Creso JV Samples Historic Pet Vein Pit, West Shining Tree Area

TORONTO, ONTARIO and MONTREAL, QUEBEC--(Marketwire - Sept. 22, 2011) - Platinex Inc. (TSX VENTURE:PTX) and Creso Exploration Inc. (TSX VENTURE:CXT)(OTCQX:CRXEF)(FRANKFURT:C3X) are pleased to release results from recent channel and grab sampling of the Gold Corona/Pet Vein Zones on their Gold Corona joint venture property near Shining Tree, Ontario.

Channel sampling on the Gold Corona/Pet Vein intersection returned up to 5.4g/t Au over 1.80m and channel samples in the Pet Vein Pit returned up to 26g/t Au over 1.35m.

The Pet Vein pit samples were collected by pumping out the 4m deep flooded pit where grab samples returned grades of up to 181g/t (or 5.3 Ounces/ton) Au. A stockpile of well mineralized Pet Vein material of approximately 3-5 tons was located adjacent to the Pet Pit and a 10.5kg character sample taken assayed 26.3g/t Au by FAA313 Fire Assay, Gravimetric and Metallic Screen Analysis. Further excavation of the pit to establish the controlling geometry of the mineralized zone for diamond drill targeting is planned.

James R. Trusler, President and CEO of Platinex Inc. stated, "The Gold Corona Joint Venture brings together several known high grade gold veins within a thick corridor of chemical metasedimentary rocks. The mineralization found within the Gold Corona and Pet veins provides impetus for pursuing both an expanded high grade body at depth and a large tonnage low grade deposit at surface."

Robert J. Casaceli, Creso President and CEO stated, "We are pleased to see the Gold Corona JV moving forward with favourable surface sampling results and we look forward to helping develop this promising property to its full potential."

A summary of the best results is included in the table below.

Of additional note is the thick low grade tonnage potential to be investigated based on the average grade of Channel Cut 7 of 0.4g/t Au over 8.23m.

All samples were collected under the direct supervision of Scott Franko P.Geo who is the qualified person for this release. Assays were submitted to SGS Labs in Don Mills for fire assay to be followed by gravimetric assay of samples grading over 10g/t Au. Screen metallics assays were performed where visible gold was noted. Samples were submitted with appropriate standards and blanks as a QAQC measure.

About Platinex Inc.

Platinex has recently uncovered strong indications of a major gold bearing zone on its Shining Tree property as evidenced by high gold content of soil samples along a nine km corridor. Platinex continues to expand the Herrick gold deposit with 66 holes drilled to date returning encouraging gold values. Platinex's management team continues to lead in the exploration and development of Platinum Group Elements (PGE's) in North America. Shares of Platinex are listed for trading on the TSX Venture Exchange under the symbol "PTX".

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About Creso Exploration Inc.

The Corporation's principal mining exploration holdings are located in the Shining Tree mining camp of Northern Ontario within 100km of the Timmins and Kirkland Lake mining camps, and additional interests are held in base metal properties in Guatemala.

FORWARD-LOOKING STATEMENTS:

This press release contains forward-looking statements, which address future events and conditions, which are subject to various risks and uncertainties. Forward looking statements in this press release may be identified by the words "estimate", "believe", "anticipate", "intend", "expect", "plan", "may", "should", "will", and the negative thereof or other variations thereon or comparable terminology. Actual results could differ materially from those anticipated in such forward-looking statements as a result of numerous factors, some of which may be beyond the control of Creso and Platinex. These factors include: results of exploration activities, general market and industry conditions and other risks disclosed in the Corporations' filings with Canadian Securities Regulators.

Forward-looking statements are based on the expectations and opinions of the Corporations' management on the date the statements are made. The assumptions used in the preparation of such statements, although considered reasonable at the time of preparation, may prove to be imprecise and, as such, undue reliance should not be placed on forward-looking statements. Creso and Platinex expressly disclaim any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise, except as required by applicable law. Depending on exploration results and available financing, the Corporations may at any point modify the suggested work program for 2011.