41. Unless reclaimed, surface mining can leave behind large areas of infertile waste rock , as 70 % of material excavated is waste. 42. Small amounts of uranium were also produced by underground in-situ leaching and heap leaching of low grade ore and even waste rock . 43. At the same time the mining method is designed to ensure that no waste rock needs to be hauled to the surface. 44. Waste rock was used as fill for facility construction or hauled to a disposal area to the south of the Brewer Pit.45. Several gallery entrances and heaps of waste rock are very still visible today ( see photo below of the Wildsch�nauer side ). 46. Waste rock from the Batu Hijau mine is disposed of in the rainforest, with space for newly produced waste rock running out. 47. Development mining is composed of excavation almost entirely in ( non-valuable ) waste rock in order to gain access to the orebody. 48. Waste rock from the Batu Hijau mine is disposed of in the rainforest, with space for newly produced waste rock running out.49. The administration says that mining would leave far too much cyanide-treated waste rock on federal land at the mountain, near the Canadian border. 50. The huge waste rock dumps were either relocated or recontoured and covered with 80 cm of clay and 20 cm of top soil.
