So, using the internal dumping could decrease the waste volume or increase the production, reduce the stripping ratio, and improve the economic benefit.

The retreat slicing blast of VCR was replaced by side blasting with more than 10 thousand tons of blasted ore each time. And the blast patten in VCR has been improved.

But China is not a full picture of the bargaining power, because China's annual iron ore capacity is far in excess of domestic production can be a large number from Australia, Brazil, African imports.