Ann: Appendix 3Y - Change of Director's Interest Notice, page-33

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jimone

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28/09/18

18:08

Post #: 35918210
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Originally posted by BigRedPanda ↑

Hi Jimone,
Knelsons and other BCCs work differently to how you have described here. They don't need a particle size matching the 'cones,' normally just a particle size below 4 mm.

BCCs are essentially riffled cones spun at high velocity to generate accelerated gravitational forces (around 60-200 Gs depending on bowl speed). High SG material (ie. gravity gold) gets stuck in the riffles in the cone, while low SG material overflows out the cone to tailings. Periodically, the bowl is stopped, the concentrate port opened and water is injected at pressure from holes inside the riffles to dump the gold concentrate which is sent for further upgrading by table, intensive cyanidation, etc.

The VSI screens would be providing closer to minus 1-2 mm material to the Knelsons for gravity separation which is pretty industry standard.

They might get better gravity gold recovery out of a ball mill in the circuit if the gold is very fine and requires extensive liberation.

My own thoughts are that if there is gold there, it isn't as gravity amenable as the testwork demonstrated, or that the head grades are being diluted down during mining and there simply isn't gold there.

It is quite simple and cheap to run some samples through gravity gold amenability, grade by size, flotation, cyanide amenability, etc. which I believe has been recommended to Orinoco previously. If they wanted to demonstrate the tails are actually high grade this would be the best option to remove shareholder doubt.

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Great post BRP, while I was there they where talking about sending a sample of our ore to have it tested by Knelson to see if we had the correct cones fitted,,, not sure what happened with that.. Cheers.. Thanks for taking the time to contribute.

OGX Price at posting: 2.9¢ Sentiment: Buy Disclosure: Held
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