New mines were built .
New mines were opened near New Waterford ( Phalen and Lingan collieries ) and at the northeastern tip of Boularderie Island ( Prince colliery ) between 1972 - 1975 .
New mines were built and opened near New Waterford ( Phalen and Lingan collieries ) and at the northeastern tip of Boularderie Island ( Prince colliery ) between 1972 - 1975 .