SpaceX and the Gold Rush of the 21st Century

According to studies conducted by the U.S. geological survey, there are about 57,000 metric tons of mineable gold on earth that has not yet been excavated. Today, it is estimated that about 244,000 metric tons of gold has been discovered (187,000 metric tons historically produced plus current underground reserves of 57,000 metric tons.) Most of that gold has come from just three countries: China, Australia, and South Africa. The United States ranked fourth in gold production in 2016. To put this