State additional secretary for Home Lalbiakzama, who is the leader of the government delegation, told PTI that the parleys were held in a cordial atmosphere and mutual trust.
"Official level talks to deliberate on the terms of the framework agreement would continue till the talks, in the final phase are elevated to political level," a senior Home department official said.
The six-member HPC(D) delegation was led by L T Hmar, working chairman of the Hmar outfit.
The name of the council was also proposed to be changed from SHDC to Sinlung Hills Council, by omitting the word 'Development', the sources said.
Dissatisfied with the 1994 accord, Lalhmingthanga Sanate had formed the HPC(D), which continued to voice its demand for an autonomous district council under the sixth schedule.
During the last talks held in December last, the HPC (D) delegates handed over the arms taken away from the police in an ambush on March 28, 2015 while the state government reciprocated by releasing the outfit's self-styled 'army chief' Lalropuia Famhoite on bail.