From pre-dynastic times, early Egyptians made their way to the Sinai Peninsula over land or across the Red Sea in search of minerals. Their chief targets were turquoise and copper, which they mined and extracted in the Sinai mountains. Archaeologists examining evidence left 8,000 years ago have concluded that some of the very earliest known settlers in Sinai were miners. In about 3,500 BC these mineral hunters discovered the great turquoise veins of Serabit Al-Khadim. Some 500 years later the Egyptians had mastered Sinai and set up a large and systematic mining operation at Serabit Al-Khadim, where they carved out...