Unlike alluvial gold, which is found as very small flakes on riverbanks, gold-bearing rocks have to be dug out ... is a physical mixture of metals, or a type of alloy. Using mercury is a pretty ...

Years after unearthing an unusual rock, David Hole found with the help of experts at the Melbourne Museum that a rock he found was a rare 4.6 billion-year-old meteorite. While searching for gold ...