MUMBAI, Jan. 30 -- After the Maharashtra government's demand that the BMC carry out biomining of the solid waste in the Deonar dumping yard and hand over the freed plot to rehabilitate Dharavi residents, the BMC's head honchos held a meeting on Tuesday and Wednesday to discuss the issue. They arrived at the conclusion that the biomining would cost them Rs 2,500 crore, besides which it would take at least 12 to 14 years to complete....