Science, Maths & Technology
Properties of gold
...world’s biggest gold producer is South Africa, where gold mines are sunk over 3,000 metres deep into the earth. There are also large deposits of gold above the ground. So-called ‘alluvial’ gold is found as small yellow grains and flakes, or even small nuggets, on the beds of fast-flowing rivers and streams. Natural erosion, flooding, glacial movement and weathering...