Au Has been a valuable resource for thousands of years, and the techniques of buying and trading it have changed markedly over the years. In early societies, Au was often used as a type of currency. People would trade Au pieces for goods and services, which made it a key https://kimberly517b8s.mysticwiki.com/1330906/examining_the_environmental_and_economic_consequences_of_extraction_practices_on_worldwide_au_supply_chains