In late 2013, approximately 500 tonnes of ore from the test mining sampling programme completed on a defined area of the Kallak North deposit was transported to a test facility in Outokumpu city, owned by the Geological Survey of Finland ("GTK"). The main portion of the material was a general composite bulk sample, representing all of the test mined sections at Kallak North in proportion to their respective occurrence.
Pilot scale test work seeks to demonstrate, by replicating production scale conditions and using large, representative batches of test material, that marketable products can be produced at sufficient recovery levels. In addition, a pilot operation enables batches of products to be produced for additional downstream test work by, for example, potential clients.
GTK's initial report in respect of its test work has now been received. Approximately 60 tonnes of the general composite bulk sample was tested during a two-week pilot campaign at GTK's facility in December 2013, primarily focusing on establishing recovery and product quality parameters for the magnetite content. Average iron (Fe) content for the sample was 29.5 per cent. The proportion of magnetite to hematite in the sample was established to be approximately 3.4:1.
The magnetite beneficiation circuit was conventional and straightforward, consisting of rod milling with rougher-scavenger cobbing LIMS (Laboratory Information Management System) pre-concentration, followed by ball mill re-grinding together with six cleaner LIMS stages to achieve the final magnetite product. The grade and recovery levels were excellent. The amount of dry magnetite concentrate produced for downstream test work was approximately 2.7 tonnes, grading at 69.4 per cent. Fe at a magnetite recovery of approximately 95 per cent. Average silica content in the final product was 4.2 per cent. and the levels of sulphur and phosphorous were insignificant, being below 0.01 per cent. The end product fineness was 80 per cent. passing 25 microns.
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