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In the context of mountaintop removal mining, what is 'overburden'?

The forest, rock and soil that are blasted of a mountains surface to expose the coal seams underneath  

According to the provided 2007 data, what was responsible for more deaths among coal miners than acute incidents like explosions or collapses?

black lung disease that is cause by long term inhalation of coal dust

Which coal mining method is typically used for seams located close to the surface on relatively flat land?

strip mining

What is the primary purpose of a 'scrubber' in the context of 'clean coal' technology?

to remove toxic compounds and particulate matter from emissions before they enter the atmosphere