:: I should also mention that most coal-to-liquids processes are much better environmentally than conventional coal-fired power stations, because they produce little if any fly ash, and because the bottom ash comes out in the form of an inert non-leachable slag that traps all the toxic metals instead of spreading them far and wide.
12.
In event of a thorium fuel cycle, Conway granite with 56 ( ? ) parts per million thorium could provide a major low-grade resource; a 307 sq mile ( 795 sq km ) " main mass " in New Hampshire is estimated to contain over three million metric tons per 100 feet ( 30 m ) of depth ( i . e . 1 kg thorium in eight cubic metres of rock ), of which two-thirds is " readily leachable ".
