According to the USGS how much total copper was contained in the world reserves as of 2018

Answer 1

As of 2018, the United States Geological Survey (USGS) estimated that the world copper reserves were approximately 870 million metric tons. These reserves are defined as the quantity of copper that can be economically extracted with current technology and under present economic conditions. Please verify this information with the latest USGS reports or publications for any updates beyond 2018.