61. In Bihar, how much area is irrigated through canal irrigation?
62. Pyrite is a
63. Fire clay is found in which rocks?
64. The important producer of saltpetre mineral in Bihar is
65. Most significant oil refinery of Bihar is
66. Manganese is found in which district(s) of Bihar?
67. Kalyanpur Cements Ltd. industry is located in which district of Bihar?
68. Vindhyan rocks have large reserves of non-metallic minerals. These rocks are found in which district of Bihar?
69. Which mineral is found in Jamui district of Bihar?
70. Kabutra and Nakia hill regions are famous for which mineral in Bihar?
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