By Deden Sudrajat and I Made Sentana 
 

JAKARTA, Indonesia--Indonesia won't back down from preventing exports by mining companies refusing to put up sureties they will build smelters, the country's director-general of minerals and coal says.

Mining companies must place cash equal to 5% of the cost of constructing a smelter in local banks to show they are "serious," Director General of Minerals and Coal at the Ministry of Energy and Mineral Resources Sukhyar said late on Thursday.

"The money will be returned after smelter construction is completed," Mr. Sukhyar said. Companies promising to build smelters can still export ore.

Indonesia banned ore exports on Jan. 12.

Six concentrates can still be exported until by 2017, according to Finance Minister Chatib Basri on Jan. 13. But minimum purity levels must be met and a special, 20% tax paid to export copper, iron ore, manganese, lead, zinc and ilmenite. The tax increases to 60% in the second half of 2016.

Companies like Arizona-based Freeport-McMoRan Copper & Gold Inc. (FCX) and Colorado-based Newmont Mining Corp. (NEM) oppose the taxes.

They add to the cost of partly processed ore, they say. The government wants to increase export revenue by adding value to ore but the mining companies claim it will do the opposite.

Write to I Made Sentana at i-made.sentana@wsj.com

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