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The operation was carried out in Dera Bugti area, some 250 kilometres (150 miles) southeast of Quetta.
The death toll could not be independently confirmed.
"The forces surrounded the militants early morning on Thursday. It culminated with the killing of 30 militants and arrest of three others," Bugti told AFP.
He added that one paramilitary was killed and five wounded during the action. "We have recovered 350 kilograms (770 pounds) of explosive material and 300 kilograms of landmines," he said.
Bugti said the militants were members of the Baloch Republican Army (BRA) and two main commanders were also killed in the operation.
"Two of the BRA commanders were also killed during the action. The forces also freed two local Bugti men kidnapped for ransom by the militants," he added.
Resource-rich Balochistan is home to a long-running separatist conflict that was revived in 2004, with nationalists seeking to stop what they see as the exploitation of the region's natural resources and alleged rights abuses.
The idea of giving greater autonomy to the province, the size of Italy but with only nine million inhabitants, is highly sensitive in a country still scarred by the independence in 1971 of its eastern portion, now Bangladesh.
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