From:

Geological Survey of Norway, Special Publication, 12

Ancient Egyptian quarries:

The surviving remains of ancient Egyptian material culture are dominated by the stones used for
building, ornamental, gem, and utilitarian applications. These came mainly from the Nile Valley and
Eastern Desert (with some also from the Western Desert), where over 200 quarries have been discovered
spanning about 3500 years from the Late Predynastic Period to the Late Roman Period.