April 21 (Reuters) - Highlands Pacific Ltd HIG.AX :
* Operations at the Ramu Nickel process plant near Madang in Png will be suspended for the duration of an investigation
* Length of investigation, being conducted by png mineral resources authority and the mines inspectorate, remains uncertain
* Extent of impact will not be known until length of shut down is clarified and any required rectification work is completed
* Plant shut down will effect nickel production in the current year
* Refers to high pressure steam supply line rupture at the basamuk nickel refinery
* Source text for Eikon