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King River Resources’ test works continue to optimise Speewah Specialty Metals Project

The test work and studies are underway to deliver a prefeasibility study towards the third quarter of 2019.
King River’s focus is to recover targeted metals from leached solutions

King River Resources Ltd (ASX:KRR) is continuing to progress the pre-feasibility study (PFS) on its Speewah Specialty Metals (SSM) Project in the East Kimberley of Western Australia.

Recent test work and studies have identified a clear path forward for the project based on sulphuric acid leaching to produce vanadium, titanium and iron products.

READ: King River Resources’ study reveals reduced capital costs for Speewah Specialty Metals Project

The sulphuric acid leaching method is also digesting a large percentage of other valuable, and globally critical metal elements (aluminium and magnesium), used in several technological and industrial processes, including the master and super alloys found in aerospace and transport products, LEDs, batteries, medical equipment, and other applications.

King River’s SSM Project cannot be easily compared with other emerging global vanadium projects which may rely solely on the future price and demand for only vanadium products.

SSM - metals targeted

Now that the leach test work has successfully demonstrated very good metal extractions from both lump and concentrates in sulphuric acid, King River’s focus will shift more to precipitation test work to recover the other targeted metals from the leached solutions.

The company will continue to focus on important metallurgical test work and studies as part of its PFS, including:

• Complete heated agitated leach and further flooded column leach test work to confirm the optimum process and conditions.
• Complete hydrometallurgical process flow sheet development trialling solvent extraction, ion exchange, thermal hydrolysis and chemical precipitation methods. Regeneration of sulphur values as sulphur dioxide (SO2) from the iron product is an important part of the process as it has the potential to reduce the sulphuric acid requirement.
• Options analysis into the capital and operating costs for an on-site sulphuric acid plant compared to importing acid and contract diesel power generation, including the supply, port access and transport of sulphur and sulphuric acid.
• Re-assay reverse circulation drill pulps in storage for aluminium and magnesium, plus other rock forming elements, for inclusion in a new resource statement. The drill samples were originally assayed prior to 2012 for vanadium, titanium and iron.
• Geotechnical studies on drill core to help finalise pit design.
• Environmental, heritage and marketing studies.

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