"The work for implementation of project supermax has come to a halt at the moment as an indefinite strike began this morning," an HPL statement said here.

Conciliation proceedings for settlement of the charter of demand between HPL and HPL Contractors' Workers Union held yesterday in the presence of the additional labour commissioner failed, following which the workers went on an indefinite strike from this morning, the statement added.

The strike call was given to press for wage revision and induction of temporary workers on the payroll.

"Around 1,500 contract workers have gone on strike," CITU state general secretary Kali Ghosh told PTI here.

The HPL plant was undergoing synchronisation of the supermax project through a planned shutdown for 75 days to raise capacity from 5.2 lakh tonne per annum to 6.7 lakh tpa.