It also threatens toundermine investor sentiment towards Southeast Asia’s biggest economy, theWashington-based bank said.

TheWorld Bank estimated that for the period 2014 to 2017, the negative impact onnet trade could be $12.5bn due to the loss of export revenue.

An Indonesian law banning the export of unprocessedminerals, specifically nickel ore and bauxite, took effect on 12 January thisyear.

It is mandated by a Mining Law passed by Indonesia’sparliament in 2009 which says mineral ores must be processed at domesticsmelters.

Indonesia’s