Notice of RetractionRational depth of transferring open-pit into underground mining at Nanfen iron mine, China

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

Nanfen iron mine is one of the largest open-pit metal mines in China, where mining depth is over 500m now. With increasing of mining depth there, to keep the mine slope stability becomes a more and more difficult task, hence, the mine should be transferred into underground mining at a suitable depth. It is a complicated system engineering problem for transferring a large scale open-pit into underground mining. In this paper, considering to get the maximum profits for miming the whole deposit, a level layering diagram optimization method is proposed, and based on the mining conditions of the Nanfen mine, by using the optimization method, a conclusion that the rational depth of transferring open-pit into underground mining in the mine should be at +10m elevation is given out.