Obelisk by Night at Luxor Temple There are several quarries in Egypt, but the preferred granite source came from the Aswan area. One of the earliest known directors of the Aswan quarry was employed by Ramses III, named Hori around 1170 BC (1). Much of the red, grey, and black granite used in the pyramids and Valley Temple on the Giza plateau was taken from here, and was utilized long before Ramses III. The stone from this quarry was transformed into the casing stones of Khafre and Menkaure’s pyramids, the 70 ton lintels above the Kings Chamber, and numerous sarcophagi, columns, and megalithic blocks on the plateau and beyond. The casing stones on Menkaure’s pyramid have caused some controversy. Robert Temple and his colleagues concluded, by using a technique called optical thermoluminescence, that the casing stones were dated between 3590 – 2640 BC, much earlier than Menkaure, and possibly confirming that the pyramids were built several hundred years before King Menes, the first Pharaoh, circa 3100 BC (2). This also dates the quarry at Aswan much earlier than previously thought, as that’s where the stone came from.
Source: Ancient Origins