February 13, 2008
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Positive Metallurgical Report for Rainy River's 17/ODM Zone New Test Results: A Significant Step Towards Project Viability
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VANCOUVER, BRITISH COLUMBIA--(Marketwire - Feb. 13, 2008) - Nelson W. Baker, President and CEO of Rainy River Resources Ltd. (TSX VENTURE:RR), is pleased to report that recent metallurgical test work conducted by SGS-Lakefield, under the supervision of Wally Rayner, P.Geo., the Company's project manager, has demonstrated that high gold recoveries are obtainable from the 17/ODM Zone using a simple combination of gravity concentration followed by flotation of the gravity tailing. Twenty-one composited 12 m half-core samples of three grade ranges were tested and an average of 94 percent of the gold was captured in the two concentrates. Moreover, the arithmetic average of the head gold grades calculated by SGS-Lakefield for these composite samples was 19 percent higher than the average grades calculated from Rainy's original assays for the individual half-core samples in the same 12 m sections.
In anticipation of a NI43-101 resource estimate being prepared by the Company covering the 17/ODM Zone, a scoping-level metallurgical test program was completed on 31 composite samples, 10 of waste rock and 21 mineralized samples representing the deposit which is located in Richardson Township approximately 80-km south-southeast of Kenora, Ontario. The test program was designed to generate communition and gold recovery data over a broad range of gold grades. Each sample spanned a 12 m core length and the aggregate weight of the samples was approximately 750 kg (3/4 tonne). The samples were collected in September, 2007 at the Rainy River site from core drilled since 2006. The sampling, handling, shipment and preparation followed a protocol developed by Wally Rayner, P.Geo.
SGS-Lakefield prepared a crushed composite sample from each 12 m core section and assayed it for gold, silver, arsenic, iron, sulphide sulphur and other elements prior to performing the metallurgical test work. The test result highlights are as follows:
- In terms of the SAG mill power index, the Rainy River material generally falls very near SGS' database mean and demonstrates a fairly tight standard deviation.
- Gravity separation gold recoveries ranged from approximately 10% to 77% and averaged approximately 26%.
- Flotation of the gravity tailing yielded very high sulphide sulphur recovery (greater than 97%), and captured 91 to 93 percent of the gold that was not recovered by gravity separation.
- Based on the very high unit gold/sulphide recovery, cyanidation of the flotation tailing is not deemed to be necessary for the deposit. This is both a substantial cost saving and major environmental benefit.
Nelson Baker commented: "Although further metallurgical testing will be required on the 17/ODM deposit, we view these results as an important milestone for the Rainy River project. Since this is a gold-dominant project, the excellent gold recoveries play a major role in the viability of the deposit."
The Quality Assurance and Quality Control (QA/QC) procedures followed by the Rainy River technical team are described in detail on it website at http://www.rainyriverresources.com/s/QualityControl.asp.
Nelson W. Baker, P.Eng., is the Qualified Person for the Rainy River Project and the person responsible for the contents of this news release.
About Rainy River Resources Ltd.
Rainy River is a Canadian precious metals exploration company whose key asset is the Rainy River gold project. With a $39 million treasury, the Company is well funded to conduct an aggressive year round resource definition drilling program and regional drill testing of priority targets. Rainy River is extremely well located in western Ontario where it is accessed by a network of roads, and is close to hydro-electric infrastructure. Ontario is low political risk and, according to the annual Fraser Institute global survey of the mining industry, has consistently ranked as one of the top jurisdictions that embraces mineral development.
Nelson W. Baker, President
This release includes certain statements that may be deemed to be "forward-looking statements". All statements in this release, other than statements of historical facts, that address events or developments that management of the Company expects, are forward-looking statements. Although management believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements are not guarantees of future performance, and actual results or developments may differ materially from those in the forward-looking statements. The Company undertakes no obligation to update these forward-looking statements if management's beliefs, estimates or opinions, or other factors, should change. Factors that could cause actual results to differ materially from those in forward-looking statements, include market prices, exploration and development successes, continued availability of capital and financing, and general economic, market or business conditions. Please see the public filings of the Company at www.sedar.com for further information.
The TSX Venture Exchange has not reviewed and does not accept the responsibility for the adequacy or accuracy of this news release.
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