note: numbers for coal exclude power station operation (which should add about a third)

I'd love to find a definite source; but from what I can find, more like a fourth.

• Lignite: 22,551 employed in coal mining (including power plants for own use) and 5,959 in brown coal firing power plants (end of September);
  
• RAG (energy giant with near-monopoly in coal mining): 35,000 employed in the coal subsidiary, 4,900 in the energy (power plant) subsidiary (in 2006)