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Mexoro Minerals Ltd. Announces Positive Metallurgical Results FromIts...



Mexoro Minerals Ltd. (MXOM.OB) (Frankfurt: OYA1) - is pleased to announce that the initial metallurgical testing on sulfide-bearing gold and silver mineralization at its Cieneguita project in Chihuahua, Mexico has returned very promising results. From 4,203.1 tonnes of mineralized material, we produced 163.8 tonnes of commercial concentrate grades of 93.7 g/t Au and 1,524.9 g/t Ag for recoveries of 92.2% and 77.4% for gold and silver respectively.



The Cieneguita deposit is hosted in a diatreme breccia, shaped like a funnel which has been flattened laterally. At the surface the mineralized body is approximately one kilometer long and averages 200 meters in width. Cieneguita hosts an inferred resource of 15.25 million tons with 2.62 g/t Au equivalent. The construction of a crushing plant is expected to be completed this month and mineralize material is currently being removed and stockpiled on site prior to processing. Once completed, the operation at Cieneguita is expected to process 750 tonnes per day for the next three years while a further infill drilling and the feasibility study is completed.



Metallurgical Highlights


> Sulfide mineralization is amenable to concentration using simple, conventional flotation technology


> Rougher flotation conducted on the composite sample recovered approximately 96.6% of gold and 85.4% of the silver in a rougher concentrate assaying 43.6 g/t Au and 747.6 g/t Ag


> Further upgrading of the rougher concentrate with a regrind and cleaning stages recovered approximately 92.2% of the gold and 77.4% of the silver from the rougher circuit into a final cleaner concentrate assaying 93.7 g/t Au and 1,524.9 g/t Ag


> Mineralogy tests reveal a direct relationship between recovery of sulfides and metals, the key sulfide being pyrite


> Standard Bond Ball Mill Work Index (BWi) testing established a BWi of 11.73 KWh/t, which can be considered to be moderate hardness



The metallurgical test work was carried out as part of a commercial pilot test on the open-pit of the gold-silver project including the various lithology types and grade ranges present at Cieneguita.



Results to date demonstrate that high recoveries of gold (96.6%) and silver (85.4%) can be achieved from the initial rougher flotation circuit. The concentrate produced contains 43.6 g/t Au and 747.6 g/t Ag. Further test work has shown that the rougher concentrate can be upgraded to 93.7 g/t Au and 1,524.9 g/t Ag through a regrind and cleaning stages. This results in an overall recovery of 92.2% and 77.4% of the gold and silver respectively into a final cleaner concentrate from a test sample of 4,203.1 tonnes of mineralized material. Further refinements of this flotation process are expected to increase the overall recovery.



Summary results of the rougher and cleaner flotation test from the processing of 4,203.1 tonnes of mineralized material are shown below in Table 1.



Grind Size P80 ('s181;m) Float Concentrate Concentrate Mass (tons) Concentrate Assay Recovery (%)


             Au (g/t)     Ag (g/t)    Au    Ag



75     Rougher     368.8     43.6    747.6    96.6     85.4


45     Cleaner     163.8     93.7    1,524.90    95.4     90.6


     Overall                 92.2     77.4



Table 1. Bulk composite rougher and cleaner and overall recovery results



The proposed process route for the Cieneguita mineralization consist of a primary grind (P80 of 75 's181;m) follow by a conventional rougher/scavenger circuit with regrinding of the bulk sulphide concentrate to a P80 grind size of 45 's181;m. The reground bulk sulphide concentrate then requires two stages of cleaning to produce a high-grade gold and silver concentrate available for sale.



Batch samples to independently verify the process and methodology used were sent to the San Luis Potosi University for metallurgical testing. The study is headed by Dr. Alejandro Lopez Valdivieso (PhD Minerals Engineering, UC Berkeley and MSc Metallurgy, South Dakota School of Mines). Dr. Lopez Valdivieso has extensive experience with the style of mineralization and type of deposit under consideration.



Barry Quiroz, President of Mexoro Minerals said: We are very pleased with these results since they indicate that we are able to produce a marketable high-grade concentrate from the mineralized material at Cieneguita, using a relatively simple process. These results are very significant as we believe they demonstrate the application of proven technology to reduce the overall project risk. This kind of achievement provides a strong encouragement to advance Cieneguita to the feasibility stage.



About Mexoro:



Mexoro Minerals Ltd. is an exploration stage company focused on exploring for precious metals in the traditionally mineral rich Sierra Madre region of Chihuahua, Mexico, which controls three historical gold-silver mines for which additional exploration has confirmed significant mineral potential. Dana C. Durgin, M. Sc. Economic Geology, has recently calculated an inferred mineralization of 15.25 million tons @ 2.62 g/t gold equivalent on the Cieneguita property. The Company also has claims on additional properties in the state of Chihuahua.



The qualified person who has reviewed this release and completed the geologic modeling and the resource calculation is Dana C. Durgin, M. Sc. Economic Geology. He is a Certified Professional Geologist (CPG #10364) with the American Institute of Professional Geologists, and a Registered Professional Geologist in Wyoming (PG-2886).



This Press Release contains certain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The Company has tried, whenever possible, to identify these forward-looking statements using words such as anticipates, believes, estimates, expects, plans, intends, potential and similar expressions. These statements reflect the Company'ss current beliefs and are based upon information currently available to it. Accordingly, such forward-looking statements involve known and unknown risks, uncertainties and other factors which could cause the Company'ss actual results, performance or achievements to differ materially from those expressed in or implied by such statements. The Company undertakes no obligation to update or advise in the event of any change, addition or alteration to the information included in this Press Release including such forward-looking statements.



Cautionary Note to US Investors:



All mineral materials have been calculated in accordance with the definition standards on mineral resources and mineral reserves of the Canadian Institute of Mining, Metallurgy and Petroleum referred to in Canadian National Instrument 43-101, commonly referred to as NI 43-101. U.S. SEC reporting requirements for disclosure are governed by SEC Industry Guide 7. NI 43-101 and Industry Guide 7 differ materially.



The United States Securities and Exchange Commission limits disclosure for U.S. reporting purposes to mineral deposits that a company can economically and legally extract or produce. We use certain terms in this press release, such as reserves, resources, geologic resources, proven, probable, measured, indicated, or inferred which may not be consistent with the reserve definitions established by Industry Guide 7. U.S. investors are urged to consider closely the disclosure in our filings with the SEC. You can review and obtain copies from the SEC website at http://www.sec.gov/edgar.shtml



Corporate Headquarters    


Mexoro Minerals Ltd.    


C. General Retana #706


Col. San Felipe,


Chihuahua, Chih. C.P. 31203


Mexico    



Tel: +52 (614) 426-5505    






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