Coal used for this process is called steaming coal. In 2008 77% of the electricity generated in Australia was produced by coal fired power stations (includes black and brown coals). Some types of black coal are suitable for coke-making.
These symptoms may occur in the back, leg and down to the foot. The most common nerve irritation originating from the lumbar spine is Sciatica. This is an irritation of the sciatic nerve, which can produce pain, numbness, and weakness down the leg along the areas innervated by the sciatic nerve.
Once out in the body the spinal nerves are considered peripheral nerves. They provide both sensation (afferent) and motor or muscle (myotomal) innervations to the body. Nerves exiting the area of the lumbar spine provide sensation and motor control to the back, buttocks, legs and down to the foot.