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Stellar Resources upgrades Severn tin deposit in Tasmania

Last updated: 13:00 24 Mar 2015 AEDT, First published: 12:00 24 Mar 2015 AEDT

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Stellar Resources (ASX:SRZ) has received the results of the Severn Metallurgical Optimisation Program from WorleyParsons, for its Heemskirk tin project in Tasmania.

The headline result for Severn was an increase in tin recovery from 72.4%, established in the PFS, to 79.5% demonstrated through sequential testing and optimisation of processing conditions for each unit process.

The PFS, released 24 July 2013, concluded that Heemskirk tin ore could be successfully treated using a conventional processing circuit involving gravity separation followed by tin flotation.

WorleyParsons completed an audit of the PFS work and developed a testing program using a “global composite” representing typical Severn mineralogy, composition and tin grade.

The purpose of the program was to simplify and improve the performance of the flow sheet and provide more information with respect to optimum process design criteria and processing conditions. 

The results are positive for its 100% owned Heemskirk project and add tangible value to the development economics.

Key advances in the process circuit include elimination of heavy media separation; increase in primary grind size; and optimisation of the sulphide float circuit, which reduces tin losses to the sulphide float tail from 10.1% to 2.6%.

This is a significant milestone for the Heemskirk project for two reasons.

Firstly, it has demonstrated a step up in recovery for Severn, the major deposit, and promises improvements for the other deposits which to date have not been tested to the same degree.

Secondly, it has provided robust data for optimising design criteria and processing conditions ahead of a definitive feasibility study to commence in 2015.

The Severn results have also been measured against the neighbouring Renison Bell tin processing plant when it was in its prime, with positive comparison.

 

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