VANCOUVER, BRITISH COLUMBIA--(Marketwire - Aug. 6, 2009) - Mr. Larry W. Reaugh, President & Chief Executive Officer of Rocher Deboule Minerals Corp. (TSX VENTURE:RD)(PINK SHEETS:RDBHF) ("Rocher Deboule" or the "Company") is pleased to report N. Tribe & Associates Ltd. has completed the preliminary economic assessment (the "Report") of the Company's 100% owned Artillery Mountains Manganese Project (Mohave County, Arizona). The Report will be filed with regulators on SEDAR within 45 days of this news release.

The Report is based on the NI-43-101 resource study by N. Tribe & Associates Ltd. ("NTA") dated February 2, 2009, using 0.91% Manganese ("Mn") cut-off, in which the indicated resource was estimated at 10.9 million tonnes containing about 1.1 billion pounds of Mn at an average grade of 4.56% Mn; and an inferred resource was estimated at 96.9 million tonnes containing about 9.6 billion pounds Mn at an average grade of 4.25 % Mn.

The Report indicates the potential development of the Artillery Mountains Manganese Project on the Lake and MacGregor claims is economically attractive and robust. Initially the Macgregor Pit and contiguous Lake claims, which are estimated to contain near surface indicated resources of 10.866 million tonnes at 4.46% Mn and inferred resources of 10.382 million tonnes at 4.7% Mn, can be mined by conventional open pit mining methods at a rate of 3500 tonnes/day. Here, the Report estimates the resources are sufficient for 17 years continuous operation from which high purity manganese metal could be produced at a rate of 108 million pounds/year (49,000 tonnes/year).

The process will be a sulphurus acid leach followed by removal of dithionate and trace metal impurities from pregnant leach solution prior to production of manganese metal by conventional electrolysis. Sulphuric acid is a by-product of electrolysis. This is recovered for re-use and production of ammonium sulphate ((NH4)2 SO4) fertilizer. Manganese recovery is estimated at 90% using this method.

The Report estimates capital costs to be US $90 million (+/- 25%) and average on-site operating costs estimated at US $0.44 per pound manganese recovered. Product transportation and marketing would add a further $0.10 per pound to overall costs. The strip ratio advances from zero to 5/1 in later years averaging 2.5/1. Recoveries at 90% Mn were used in the Report.

A preliminary financial modeling, on pre-tax basis, using for the base case a manganese price of $1.10/lb is shown below:

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