 The Carlin mine began producing gold in 1965, but at a gold price of US$35 per troy ounce, ore grades were still too low to cause a rush to northern Nevada.It was not until the gold price escalated in the 1970s that mining companies began to target similar deposits.The Carlin Trend, part of what is also known as the Carlin Unconformity, is wide and long running northwest–southeast, has since produced more gold than any other mining district in the United States.