Copper price surges to 2-year high

Copper futures trading on the Comex market in New York raced higher on Tuesday on renewed optimism about demand from top consumer China and indications of tighter global mine supply.

Copper for delivery in September jumped to a high of 2.8540 a pound ($6,292 tonne) in early afternoon trade, up 4.3% on yesterday's close to the highest since mid-May 2015. Copper's 2017 year to date gains in percentage terms now top 13% and the red metal is trading 28% higher than this time last year.

TC/RCs are a good indication of conditions in the spot market and rates have now fallen by 10% from the start of the year

While Chinese imports of refined copper dropped in June and is down 18% over the first half of 2017 to 2.23m tonnes, shipments of copper concentrate continue to strengthen jumping 23% in June from the month before to 1.41m tonnes.

Another sign that primary copper supply is tightening treatment and refining charges levied by smelters for concentrate are declining. TC/RCs paid by mining companies are a good indication of conditions in the spot market and rates have now fallen by 10% from the start of the year to around $80 a tonne and are well below the price floor set by China's major refiners for the third quarter.

Supply disruptions at some of the world's biggest mines including BHP's Escondida mine in Chile earlier this year and ongoing strike action at Freeport McMoRan's Grasberg operations in Indonesia are also boosting the price.

Workers at Grasberg last week extended their strike for a fourth month to end August. Freeport's temporary exporting licence is coming up for renewal in October, a bargaining chip used by Jakarta as it negotiates with the Phoenix-based company about divesting a majority stake in its Indonesian subsidiary.

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