Add spaces: ThevastquantitiesofpreciousmetalswouldberetrievedfromPotosiinpresentBolivia.There,discoveredtheSpaniardsin1545oneoftheworld'srichestsilverdeposits.
The vast quantities of precious metals would be retrieved from Potosi in present Bolivia. There, discovered the Spaniards in 1545 one of the world's richest silver deposits.