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What is the outsourcing borehole of Gaohe Coal Mine in Changzhi City?

The coal mine entrusts the underground drilling work to other company contractors.

Gaohe Coal Mine in Changzhi City outsourced the underground drilling, and the coal mine entrusted the underground drilling work to other companies and contractors. Technical requirements related to the construction process are provided by the coal mine and determined by the outsourcing company according to its own experience and professional knowledge.