Most of Western Australia (WA) is made of very ancient rocks from the Proterozoic era. These rocks include a great deal of iron ore, which is exported to Japan and elsewhere. Other metals such as nickel, copper, lithium and gold are also found in the area. The area was connected to India and Africa in the Neoproterozoic era, and stayed connected until the break-up of Gondwana about 150 to 50 million years ago (mya).