SHANGHAI, Oct 23 - Western Mining Co , China's second-largest lead miner, will boost the projected mining capacity of its two copper mines in China's western provinces, it said on Tuesday.

Western Mining, in which a unit of Wall Street Bank Goldman Sachs holds an 8 percent stake, has said it would use the proceeds from a share issue early this year to expand facilities including copper mines.

The company, also China's fourth-largest zinc miner, said it would double the planned mining capacity of an Inner Mongolia copper mine to 4 million tonnes a year by 2010. The mine went into trial operation last week.

It will also boost the production capacity of a copper mine in the western province of Qinghai to 750,000 tonnes a year, from the originally projected 500,000 tonnes, by 2009. The mine is scheduled to begin trial operations late this month with a capacity of 250,000 tonnes.

Shares in the company rose 0.42 percent in early trade on Tuesday to 52.32 yuan, in line with a 0.40 percent rise in Shanghai's benchmark index .