Opal was discovered at Coober Pedy in 1915. This is where most of the “white” or “milky” and crystal Opals (together known as “light Opal”) are mined. Coober Pedy is the main producer of white precious Opal, which is predominantly seen in stores overseas, particularly in the USA. Today, the Opal fields encompass an area of approximately 45 kilometres. The Opal level is formed of soft pinkish clay mixed with soft bleached sandstone. The name “Coober Pedy” is an Aboriginal word that translates “man in a hole”, and with temperatures around 40 degrees Celsius or 100 degrees Fahrenheit all year the cool underground mines have become popular as living quarters, and now most of the locals live underground!