Study on the enlarging production scale of the underground metal mines based on sustainable development

The production scale of the underground metal mine is one of the decisive factors to be considered when the mine is enlarged. First, the article established an appraisal index system to evaluate the input-output benefits for the underground metal mine, which take sustainable development into account; Second, did a quantify research on the sustainable ability of the diggings; Third, improved C²R model; Finally, got the production scale through the calculation with the mine data collected.