Sandpit

I'm working in a very large sandpit. This was how my career was summarized by my loving friends and family. The fact that I'm no longer in contact with any of them is a completely different matter, of course :-).

The Sandpit I Call Home

Open cut coal mining is all about balancing the sand or dirt to get to the black gold underneath. I've only been at my new open cut mine for three weeks, but I've learnt so much already. The diagram below illustrates the basics of open cut mining (as seen through the eyes of a geologist :-).

Open Cut Coal Mining

The first stage is clearing the area (after the correct environmental procedures and plans have been followed). Then comes the removal of the overburden. There are different methods of open cut mining. For example, strip mining or terrace mining. The method used depends on the geology of the area. How deep are the coal layers? How many coal layers are present? Are the rock strata horizontal or at an angle? Are there any structural features likes folding affecting the strata?


One of the biggest challenges is to remove the dirt above the coal without damaging or destroying the coal and then to manage the space available for dumping the dirt. This is done by deploying the correct machinery to the right stage in the process. The dirt is typically moved to sites where the coal has already been removed. One big thing I've learnt is the dragline never touches the coal. It only removes the overburden. The bucket on the dragline is too rough of a tool and easily scrapes away valuable coal.


I sometimes feel a bit silly at work when I don't know what the hell is happening or what people around me are talking about. But, the guys I work with are amazingly helpful. The geologist I'm learning from has been sitting with me and slowly teaching me the modelling software and how open cut mining operates. It's been wonderful. And, I'm loving being in the sun.


So it is a bit like playing in a sandpit :-).