Sheffield Resources has announced assay results from reverse circulation drilling at its Oxley potash project near Three Springs in Western Australia's Mid West region. The drilling tested an 8-km strike length of the target microsyenite unit, obtaining mineralized widths up to 75 m (average 36 m) and [K.sub.2]O grades up to 9.8% (average 8.4%) at a 6% [K.sub.2]O cut-off. Coherent higher-grade zones occur within these intervals, with widths up to 39 m (average 15 m) and [K.sub.2]O grades up to 10.4% (average 9.9%) at a 9% [K.sub.2]O cut-off.
Sheffield also completed three diamond drill holes at Oxley. Drill core from these holes was being processed in late July, with results expected during the third quarter of 2013.
Oxley mineralization is an unconventional, hard-rock style of potash mineralization, hosted by a series of ultrapotassic microsyenite lavas, which typically contain more than 90% sanidine (potash) feldspar. These host rocks are exposed at surface and dip gently under cover in a series of open folds.
Sheffield is planning preliminary metallurgical testwork to evaluate the process required to extract potassium from the sanidine feldspar to produce muriate of potash or sulphate of potash products. The test work will also explore the potential to produce secondary products, including iron, titanium and aluminum compounds.
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|Title Annotation:||Exploration Briefs|
|Publication:||E&MJ - Engineering & Mining Journal|
|Article Type:||Brief article|
|Date:||Aug 1, 2013|
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