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  • Investigator Resources Shows Conventional Processing Route At Paris Project 0 comments
    Oct 21, 2013 1:43 AM

    Investigator Resources (ASX: IVR) has completed metallurgical trials indicating that mineralisation from the Paris Silver Project in South Australia is amenable to conventional processing.

    The tests returned initial silver recoveries of between 65% and 97% from a range of samples that represent a majority of the Paris deposit.

    Flotation trials were successful in producing a rougher concentrate of 1,405 grams per tonne silver, which is in the acceptable range for smelter sale, however this is likely to be further upgraded with cleaning.

    Further increase in silver recovery are expected by optimisation with standard leach and/or flotation techniques.

    "We are very encouraged with the first-pass metallurgical results that indicate the Paris silver mineralisation is likely to be amenable to conventional extraction processes," managing director John Anderson said.

    "This adds confidence to the Paris silver project for which a maiden resource was announced last week containing 20 million ounces of silver at 110 grams per tonne silver and 0.6% lead using a 30g/t silver cut-off.

    "These initial metallurgical results add to the positive attributes of the grade, shallowness and open extent for the Paris silver project. More metallurgical work will be scheduled at the appropriate time in 2014. This is expected to achieve even better recoveries through optimisation of the processing pathway." Mr Anderson added.

    The next phase of metallurgical investigations, expected to be scheduled in 2014, will look at ways to improve the recovery of the silver and also to recover the lead. Lead recoveries have not been considered as part of the initial test work program.

    Metallurgical Study

    This initial metallurgical study was designed to characterise and understand the Paris silver mineralisation, identify any potential metallurgical issues and support the recently announced Paris Silver Project Resource.

    Seven metallurgical samples were selected as representative of mineralised rock-types and grade ranges from areas within the resource enveloped.

    These were drummed according to procedures provide by the Core Resources Group and sent to their laboratories in Brisbane.

    A series of tests were conducted as part of the grind analysis. No potential problems were identified for the grind circuit.

    The final test on material behaviour showed that all samples were sticky due to high clay content which would impact on slurry viscosity in the processing plant.

    A series of standard cyanide leach bottle roll tests were positive and indicated that the Paris mineralisation is generally not complex or refractory. Recoveries increased with the longer leach time.

    Cyanide consumption was low to moderate with the moderate levels in samples with elevated base metals.

    Further work may remove the base metals via flotation ahead of cyanidation.

    In addition, the difference between the 24-hour test and the 48-hour test for silver recoveries indicates a longer leach time would likely give an even better recovery.

    Paris Silver Project

    The Paris Silver Project has an Inferred Resource of 20 million ounces of contained silver and 38,000 tonnes of lead.

    Notably, the untested lateral extensions to the drilled resource area offer opportunities to expand this Resource, which is located at a potentially open-pittable depth.

    Silver Demand

    Silver is the ideal industrial material, with no other metal having its combined strength, malleability and ductility, or facilitates electrical and thermal conductivity as well, or can reflect light and endure such extreme temperature changes, according to The Silver Institute.

    Jet engines depend on silver-coated bearings for their performance and safety, with all jet engine manufacturers utilising these high-performance silver bearings which provide critical fail-safe lubrication.

    Silver is also used in the treatment of burns, where its unique bacteria-fighting qualities forms the basis of silver sulfadiazine, which is used in every hospital in North America to promote healing and reduce infection.

    Over the last three decades, global consumption of silver has been higher than it has been mined, with rising demand and diminishing supply set to provide support for the silver price.

    On a global scale, Mexico is by far the world's biggest producer with 162.2 million ounces in 2012, followed by China (117moz), Peru (111moz) and Australia 57 million ounces.


    With both a Resource and initial metallurgical studies in place, Investigator Resources has built a platform to further expand resources and optimise metallurgical recoveries.

    As noted in its studies, there is considerable scope to further increase recoveries of silver from the Paris Project while work has yet to be carried out on recovering lead.

    Along with expectations of growing silver demand, the company is well placed to progress the Paris Silver Project towards development and production.

    Proactive Investors Australia is the market leader in producing news, articles and research reports on ASX "Small and Mid-cap" stocks with distribution in Australia, UK, North America and Hong Kong / China.

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