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GOLD EXTRACTION
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More refractory answers
The Intec Process operates in the chloride medium to recover base and
precious metals from mineral ores and concentrates in a cost effective and
environmentally safe manner. Monument Mining last year completed
construction of an Intec pilot plant and commissioned it at the Selinsing
gold mine in Malaysia. The plant was built as a part of the Intec Trial Testing
Program to exploit Intec’s sulphide dissolution and gold recovery
technology using the existing Selinsing gold processing plant under the
Interim Intec licence. An exclusive licence of Intec technology over
southeast Asia will be granted upon success of the commercial Intec trial
testing program.
The design of the pilot plant circuit is based on the extensive first stage
metallurgical and chemical laboratory test work completed by the in-house
Monument research and development team, which has successfully
demonstrated the technical ability of the Intec technology to dissolve
sulphides and recover gold from the sulphide material on a bench scale test
work program in the Selinsing laboratories.
The purpose of the pilot plant trial testing work is to demonstrate two
main aspects of the process; that the bench scale batch test work results
can be duplicated in a continuous flow process and that the process can be
successfully scaled-up. The Intec Process has been the focus of Monument’s
effort to provide a technology that has the ability to process sulphide gold
material economically at Selinsing – and potentially elsewhere. If successful
it will extend the life of the project using the existing Selinsing process
facility and infrastructure well into the future. Based on the Intec success in
sulphide dissolution and gold recovery results, the test work program will
then be extended to exploit Intec technology to sulphide copper and other
base metals.
Monument Mining says “the Intec Gold Process offers particular
advantages for refractory or arsenical feedstocks. As example, where
arsenic is present in a mineral concentrate (perhaps as arsenopyrite), the
conventional roasting technologies become both potentially
environmentally hazardous and expensive, due to the formation of volatile
arsenic trioxide. By contrast, the Intec Process can leach the arsenopyrite to
liberate the gold while leaving the arsenic behind as safe, environmentally
stable ferric arsenate, an analogue to the naturally-occurring mineral scorodite.
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