In the 1930s, a British scholar predicted based on his own research results that a severe shortage of copper resources would occur worldwide  The current situation is that after geological exploration, the U S  Geological Survey estimates that the copper resources on the earth's surface are at least up to 3 billion tons, which can be used by humans for 185,000 years
With the improvement of human exploration technology, this number may continue to rise in the future
The shortage of copper resources has been resolved