Call it poetic license. Interestingly amongst those 19 posts...

Call it poetic license. Interestingly amongst those 19 posts were some figures used to describe the potential amount of ore that could be brought to surface and processed. Now this had figures based on a certain dig rate, 1.65m/day and proportion of the mine face that was graphite ore. Figures of 900t per vein were thrown up iirc. There's a few more issues we should consider. One is that the width is 50cm but length or height was the length or height of the entire mine face using such a model. Not being knowledgable in mining I always assumed the vein would approach something more like a cylinder in shape, so I always assumed an intersection was a possible diameter for that vein. So that rather than encountering a vein that was 50cm in one dimension and 2m in the other it was 50cm diameter cylinder that travelled downwards. This would decrease the volume of ore pulled up quite a bit especially if the dig rate of 1.5m per day was used. On the flip side all the mining is currently progressing the drive(s), so there is only one or two mine faces. But what happens when they start following multiple veins at once? Are we able to sum the vein widths together? And then figure in multiple shafts each with multiple veins? Even at 1.5m per week if this is replicated on enough veins of suitable widths, ie 90-100cm.