PART 1 -FOCUS NOW IN COPPER GRADE AND MILLING12 May 2022 12:00
If I had a choice between having to sort out the milling and the mining I would opt for the former every time. So the good news is that RMM seem to have now got the mine in a shape where it can produce enough ore to meet the current capacity of the mill. Toby B was explicit in the last RNS: 'Our mining is now at a rate that can support the designed plant throughput...' Looking at the mining numbers they were 35,535 dmt for last month. Now is you take 30 days that is only 1,185 dmt so below the milling capacity of 1,350 however there is a stockpile of 22,500dmt at the mill so it may be they have not mined at max. The daily dmt mined is also on an up having been 1,073 in Mar, 1,091 in Feb and 813 in Jan (assuming every day in the month was worked). So I will chose to take TB at his word that the mine is no longer a restricting part of the process which is an ENORMOUS achievement.
So now let us turn to the mill. The output of copper to sell is broadly dependant on 2 factors: how much ore you feed in and the grade of copper in that ore (there is also the recovery % but that seems to be stabilising at 95-97% so I will leave that out other than for calculations.
In Apr the RNS tell us that 30,195 dmt were milled with 9 days at or below 800 dmt because of the crusher issues. Noting that the RNS says at or below 800 I have run calculations with an average dmt for those 9 day of 800 and of 750. With the former that means 7200 dmt were mined in those days leaving 22999 tones to be mined over the other 21 days of the month. That would therefore be 1095dmt. If they did not work Easter day that would be 20 days therefore 1150 dmt p.d.and if they also did not work good Friday that would be 1210dmt. With the later (750) that means 6750 dmt were mined in those days leaving 23445 tones to be mined over the other 21 days therefore 1116 dmt p.d, if 20 days 1172 and if 19days 1234.
It is important that we do not know:whether the days above 800 dmt were all full days or whether it was a gradual ramp up to full production, whether rented crusher was used in lieu of the normal crusher for some of those 21 days and if so how its capacity compared, and we do not know whether for the half of May when the rented crusher will still be on site whether it will be possible to use it in parallel with the normal crusher and therefore boost throughput.
So turning now to grade. TB tells us in the RNS: '... we will now optimise the feed grade to the mill'. Is is therefore hopeful that we are going to be significantly above the 1.46% grade of Apr which was due to working a specific zone for reasons other than grade, and at least at the 1.6% of Mar. We might get to 1.7% and perhaps even 1.8%. Now this being mining they might have the option, increasingly likely with the increasing number of stopes, of chasing to mine even higher grade but I will hold off on that upside scenario.
So for calculations I will do it with 1100, 1150, 1200 and 1250 dmt per day and with grades of 1.6%,