-lrb- prague denni telegraf 7 jan 94 p 6 au -rrb- mining company merger : a new mining company , severoceske doly chomutov , -lrb- north bohemian mines chomutov -rrb- was established on 1 january 1994 after two state-owned companies , doly nastup tusimice -lrb- tusimice mines -rrb- and doly bilina -lrb- bilina mines -rrb- merged .