The history of metals By Ryan Cui 6000 BCE Gold in 6000 BCE 3000 BCE silver in 3000 BCE 3000 BCE tin in 3000 BCE 1300 BCE Iron in 1300 BCE 1789 uranium in 1789 CE 1791 Titanium in 1791 CE 1794 Chromium in 1794 CE 1824 Silicon in 1824 CE
