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I would advise that you consult with your local earthmover tyre supplier. Most suppliers produce an engineering / technical data book and in additional to tyre dimensions and peformance data the gross contact area of the tyre is normally available. Some advice from the supplier may be required...

Further to Doug Hambley's recommendation, I would strongly urge anyone to perform a risk assessment prior to welding anything onto a drill rod. There was a fatality at a Western Australian mine during the 1990's when a boilermaker was either welding or cutting some old T51 rods. The rods had...

If you are unable to source a rig in Europe have a look in Australia, particularly in Western Australia. If you are unable to secure a rig there are a number of drill and blast contractors based in Perth who have existing activites in Africa. This may provide an alternative option for you...

I have seen successful mining in similar environments by : 1 excavate or dregde a hole in the centre of the area (lowest point) to be mined to a level deeper than final design, install pumps to dewater 2 dividing the areas into sections, dig large drains (similar to a moat) around them and...