Global silver trade from the 16th to 18th centuries which China desired, so they traded silver to make up for their trade deficit. The two most important mining colonies of the Spanish Empire were Peru and Mexico, who were estimated to have provided one-hundred thousand tons of silver from the mid 16th Century to the end of the colonial period. The richest, and most productive mine in the Americas was that of Potosí in what is modern day Bolivia. The richest camp in Mexico was in the city of Zacatecas, however the production of this mine was far less than that of Potosi. More simplistic native mining techniques dominated
Aztec West fund but in the mid-1980s was sold to Arlington Securities. The buildings are in the high tech and postmodern styles and were designed by practices including Nicholas Grimshaw, Michael Aukett, SOM and CZWG. In 2018, selected buildings on Aztec West were listed. Aztec West is home to over 100 companies, and 7,000 people work there. The Aztec Centre was opened by Margaret Thatcher on Friday 15 December 1989 and there is a plaque to commemorate this in its entrance. The park includes warehouse/factory units, the four star Aztec Hotel, several office villages, a central retail area and a Starbucks connected