Ann: Development Progress - Lindi Jumbo Mine, page-3891

Morning Farmer,

These guys still don't get it.

The mining contractor is not going to risk producing oversized material for the processing facilities, they will increase the blast which will only mix more of the high and low grade. This outcome will only impact the TGC grade being processed at the processing facilities' reducing the mines output.

On the other hand, If WKT gets cranky about the lower grade being processed, the contractor will reduce the blast which will result in more oversized material. These guys think the contractor will remove the bucket of the excavator, attach a rock break, and then reduce the size of the material. I cannot see this happening, the contractor will pick up the oversized material and send it to the stockpile.

I am sure you are just as frustrated as I am with the pump crew, instead of them understanding that these excavators (30-45 tonnes) have a breaking force of over 200kn, instead of these rocks breaking up into small fragments while being excavated, the contractor required to install a rock breaker with around 5000 joules of force to reduce the size.

Even the video that Mike showed of the crusher, the one oversized rock took considerable time to be pass through the crusher, this isn't the same type of material WKT previously showed that could be crushed by hand.