Global copper grade is gradually declining, with Richard Schodde's 2010 report showing that global copper mining grade fell from 4% in 1900 to 1.07% in 2010. Based on the average value of copper mining grade of 18 major overseas mining enterprises, the decline in ore grade mining was even more obvious, from 0.79% in 2000 to 0.43% in 2021. The main reasons for the decline in copper mining grade are, on the one hand, the ore grade of newly opened mines is generally not as good as before, and on the other hand, global mines are facing the problem of aging. Under the background of stable ore treatment technology, the decline in ore grade means an increase in mining costs, and excessive impurities lead to environmental protection problems caused by solid waste discharge, which in turn restricts the expansion of copper ore volume.