Chennai The Supreme Court’s extended ban on mining in Tumkur and Chitradurga districts of Karnataka is expected to cast a shadow on the iron ore miners and steel companies. The ban on two more districts, in addition to the one in Bellary, will result in a sharp decline of iron ore production which will be followed with a severe cut in steel production. The performance of companies such as Sesa Goa and JSW Steel is expected to be adversely affected, said a report of Angel Broking.