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.
Sometimes patients experience good pain relief early on after their surgery, but as the scar tissue slowly forms, the pain relief diminishes and leg and back pain recurs or increases. Occasionally the nerve damage from the original cause of the patient's pain makes the nerve heal more slowly.