In 1648, Jesuits carrying a large cache of gold were attacked by Indians and forced to bury their gold. The sole surviving priest returned to the area a year later and was unable to find the location of the buried gold.
The estimated treasure holds 2,700 gold bars and between 4,000 and 5,000 silver bars.
In 1929 three miners accidentally stumbled across 700 gold bars of this treasure. They were southeast of Ajo near the Mexican border in Pima County. The last surviving miner died in 1963 without ever revealing the location.