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crystal clear. Great explanation and really helpful. I am sure...

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Jenkstar

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19/07/21

17:48

Post #: 54609937
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Originally posted by CD1999: ↑

@ Jenkstar. First calculate the amount of material that will be treated and subjected to flotation. Fines assumed 20% of 0.5 Mt is 0.1 Mt by-passing sorting. Therefore 0.1 Mt at resource grade (I ignored dilution as of minor consideration given ore sorting dealing with the waste, a somewhat optimistic bias). Using the resource grades I get to 1,800 t Pb, 6,900 t Zn and 106,100 oz Ag send to the mill. The amount to the sorter is 0.4 mt containing 7,200 t Pb, 27,600 t Zn and 212,200 oz Ag. Ore sorter recoveries for these metals are quoted respectively 94.0%, 94.5% and 93.5%. Applying these you get 6,770 t Pb, 26,100 t Zn and 400,000 oz Ag sent to the mill in 0.18 Mt material after waste rejection.

The metal recoveries in the milling and flotation plant is 74.2% for Pb into Pb-concentrate, 96% for Zn into Zn-concentrate and 59% for Ag into Pb-concentrate and 24% for Ag into Zn-concentrate. To calculate the amount of concentrate product use the indicated concentrate grade for Pb-concentrate (75.8% Pb) and Zn-concentrate (63.3 % Zn). When you divide (8,570 t Pb treated x 74.2% recovery) by 0.758 you get 8,387 t Pb-concentrate and for Zn-concentrate (32,982 t Zn x 96%) / 0.633 = 50,020 tonnes. Silver reports to both concentrate. Calculate the amount of silver recovered in each and divide this amount expressed in grams by the amount of concentrate tonnes you calculated. I get 553 g/t Ag per tonne Pb-concentrate and 38 g/t Ag per tonne Zn-concentrate. With the latter grade being below the minimum threshold of getting paid (assumed by me 50 g/t) the silver in Zn-concentrate will not attract any paid.

I hope this is now clear.

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crystal clear. Great explanation and really helpful. I am sure there are a number of us who have learnt a few things from you today. Many thanks.

AZI Price at posting: 8.7¢ Sentiment: Buy Disclosure: Held
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crystal clear. Great explanation and really helpful. I am sure...

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