Yeh good pick up plough, just watched the presso on youtube now. Have already mined 200m so that more or less offsets the additional vertical 30m (230m vs 200m).
Don't measure the future from historical mining rates...the first 160m was mined in bad ground and look at the photo you will see floor to floor fibrecrete which chews up your cycle times (pretty much double it). Because of the poor ground, cuts would have been bored short (generally 2m opposed to a full 4.5m round) to maintain decline profile - reduce overbreak. Tony mentioned in the presso its now into bolt mesh bore cycles because the ground has improved so looks like the use of fibrecrete has stopped. So....the combination of Fibrecrete and cuts bored short is why we got 200m in 2 months. This shouldn't be set as the standard rate of advancement going forward.
You will also notice in the mine schedule its a race track decline (not a cork screw decline which is continuously turning) so you will get full length straight on rounds. Corkscrew declines you normally pull cuts to 3.5m as you need to pull short your inside steels while boring full length on your outside - this is how the decline turns. The race track decline allows operators to bore cuts straight on - allowing full length cuts to be taken. The rig Byrnecut are using looks like a 16/10 split feed which will be drilling with 4.9m steels (the cut normally pulls 4.5m when using 4.9 steels). The 421 16/10 split feed sandvik rigs are most likely set up with high frequency drifters so they will perform in harder ground.
If you have the right crew and management on site (front line ops, good ground, good availability of equipment >85%, basic ground support regime) then you should be advancing more than 350m per month.
G1A Price at posting:
20.5¢ Sentiment: Buy Disclosure: Held
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