RE: Record Time ?3 Oct 2020 12:55
Hi Bamps,
I had also heard of 7:1 as being the standard for the decline but I was just relaying the email as it was sent.
If you read the post again he says the portal entrance to the decline would be about 25m depending on ground conditions and the decline would be to a depth of about 500m, so about 80m below the top of the ore-body.
As for the TBM vs drill & blast - you are quite right, NCM are the experts and they will use the optimal method. Just wondering what the lead time on a machine like that would be? Would they have had enough time to determine the type of machine that would be optimal. Reading up on them there are an infinite number of variations depending on ground conditions, etc, etc.
Maybe they can be more dynamic in dealing with the variations between the looser Permian covering and the harder basement sequence if they use traditional methods??
Whatever method they employ we can agree that NCM are progressing this at breakneck speed.
GLA - Paddy