China's lower copper stock piles gave copper prices a major boost, exceeding the $6,800 trading price, so far at its highest level in four weeks.

Three-month delivery copper rose as much as 1 percent to $6,840.25 a metric ton on the London Metal Exchange and traded close to $6,800 in Shanghai at Monday's closing.

As the world's largest copper user, reports indicated that Shanghai copper stockpiles decreased by the most in 11 months last week,

The metal rose to $6,875 a ton on June 25, the highest price since June 1. Lead posted a 1.9 percent increase to $1,850 a ton and nickel rose by 1.8 percent to $20,100 a ton, respectively.

Zhongcai Futures Co, a Shanghai based firm, said in today's forecast that reductions in London and Shanghai inventories gave copper prices a boost. Zhongcai, however, is not optimistic that declines could be sustained.