Spiral Concentrator ( Test unit) J. Farmer Mining
MD Spiral concentrator for continuous separation of heavy minerals. This test unit collected nearly 100 of the heavy minerals without much tuning. I did have losses of gold in the minus 150 mesh size fraction but of course this is just an old test unit. I m sure I will be able to fine tune my recovery with a newer model more rightly matched to the gold in my deposit. This is a relatively steep all around test unit that would probably be better suited to upgrading material with a much higher percentage of VHM s. (very heavy minerals) Plus this unit has only four turns and a 6 or 7 turn unit would allow the ultra fine gold to migrate into the concentrate line. Material was screened to 20 mesh and did not need desliming. Over all it produced excellent results.
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