So a 1:7 decline with say 50% ancillary development, 1:10.5 in all, cannot advance 1,575m per year (not much more than a cut a day) or 150 vertical metres per annum. Is that what you are saying? Head back to your text book and read it more carefully. You'll find that 70 vertical metres per annum is a measure used to estimate the time to fully extract a block of undeveloped ore, i.e. decline to the base of the stoping block, establish infrastructure, complete ore development and stope out and backfill the block.
They don't have to get to the base of the Far West ore reserve to start stoping. If you look more carefully at the isometric of Far West you'll see that they have say seven months (30 September) to develop about 50 vertical metres to the base of the uppermost block, establish the lowest ore drives, start stoping and thereby fulfil their public commitment.
Any comments on my other points?
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