RE:from stockwatchTellingly, Mountain Province and De Beers plan to increase the cut-off for their diamond plant to 1.25 millimetres from one millimetre. The difference will cut the grade and boost the average diamond price accordingly. Some value will be lost, but Mr. Brown says that the move will allow the mine to increase its throughput by up to 10 per cent, resulting in greater revenue on an hourly basis. This is exactly what I was pointing to when I posted the the post below in August 2018. So the value per carat will go up, the carat per ton will frop about 10% which will be the smaller 8 dollar diamonds, the volume of ore processsed will go up because we are not going after the finer grade, and because of the greater sieve size we will get an increase in the larger diamonds because of the increase in processed ore.
Feasibility done at 1.5 mm sieve vs. actual 1 mm sieve
Let us assume that the actual carats per ton went up because of the difference between the two sieve rates which is approximately 20% . This assumption means we are producing 20% more of the finer diamonds. The finer diamonds have been selling at about 8 dollars US per carat. Look what happens to our actual carat value when you remove the smaller diamonds.
Actual
sale Number of carats revenue average value per carat.
1 351,000 27,379,000 78
2 177,000 25,134,000 142
3 451,000 26,669,000 59
4 350,000 28,350,000 81
5 356,000 30,260,000 85
6 334751 22,093,566 66
total 2,099,751 159,824,566 79.13 average
Now lets look at if it was done with a 1.5 sieve as in the study and we remove the 20% smaller diamonds at 8 dollars US per carat.
sale Number of carats revenue average value per carat.
1 280,800 26,816,400 95.5
2 141,600 24,850,800 175.5
3 300,800 25,887,400 71.75
4 280,000 27,700,000 99.25
5 284,400 29,690,400 104.25
6 267,800 21,557,964 80.5
total 1,615,800 159,824,566 96.91
So that is a difference of 403,950 carats for a revenue of $3,231,601. I have discussed this in the past with some board members and asked if it was worth going after those smaller diamonds because at some point there is what they call a point of dimishing return. I was informed that it would be the same cost and that we would be missing the additional revenue.
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