Hindustan Zinc's demerger process will kickstart once the central government, which owns roughly 29 percent in the mining company, completes its long pending divestment process, chief executive officer Arun Misra told Moneycontrol in an interview on April 19. Moneycontrol reported last year that the government was weighing offloading only 3.5% of its stake via OFS route in the initial tranche.