(1) (a) How many mines are currently operating and (b) what excavation method is practised at each specified mine, including, but not limited to, (i) strip mining, (ii) open-pit mining, (ii) mountaintop removal, (iv) dredging, (v) highwall mining, (vi) drift mining, (vii) slope mining and (viii) shaft mining; (2) how many mines were operating in the (a) 2007-08, (b) 2008-09, (c) 2009-10, (d) 2010-11 and (e) 2011-12 financial years?