Such challenges are indeed solvable, but they add to the cost of the power generated. That becomes a problem when other sources are cheaper. What happened with the IPP saga in Pakistan? Do we want a repeat of that fiasco?
For cheaper coal, I would say it would be better to import from Indonesia, South Africa, and Australia. in that order. (I am presuming other sources of coal than energy, coal is by far the cheapest today), and I had made the last comment without reading the data on Thar coal, from whatever is available online, It made me scream, ( Moisture 48.57 percent, Volatile matter 29% , fixed carbon content is less than 22%, and heating value (GCV) is 1523.8 Kcal/kg, and 2,000 million tons recoverable reserves, USAID study of 1994 and other news resources) I would strictly advise to run the numbers again. At 48% moisture (half of it is essentially water!)
In the odd 8 or 10 power plants I have been in India any thing above 30% makes the pant so inefficient that its better not to run it at all, and even at the worst possible scenario you need coal above with heating value (GCV) 2000-1800 kCal/Kg @ 12-14% moisture.
The mining is unattractive too the heat content is too low, water availability in Thar is a big issue, etc. If you ask me, of my odd decade of experience in power sector, India and abroad. Import that damned coal, it not worth the mining.