While 27 of the militants were from the Karbi Peoples' Liberation Tigers (KPLT), six belonged to the National Democratic Front of Bodoland and two from the United Liberation Front of Asom (ULFA).
The militants also handed over a large number of arms and ammunition today.
Among those who laid down arms were KLPT's self-styled Foreign Secretary Moniram Rongpi and self-styled Defence Secretary Ramling Ranghang.
Besides Gogoi, Assam Planning Minister Tanka Bahadur Rai, state assembly Deputy Speaker Bhimananda Tanti and General Officer Commanding (GOC) of Army's Four Corp Lt Gen Shakti Gurung were also present on the occasion.