In 1960 it were only three primary schools in Bintulu . These schools provided classes until Primary 3 level . It were no secondary schools . Villagers could pursue their secondary school studies at either Miri or Kuching by using small boats as it were no roads connecting Bintulu to either Miri or Kuching . Bintulu Government Secondary School was opened in 1964 . In 1967 Bintulu celebrated the first 100 years of the Council Negri meeting ( Sarawak State Legislative Assembly ) . A stone monument was built in front of a government rice storeroom to commemorate the event . Bintulu was a sub @-@ district of Miri Division in the 1970s . The sub @-@ district was upgraded into a district in 1987 .