https://en.wikipedia.org/wiki/Stone_quarries_of_ancient_Egypt

Aswan is the ancient city of Swenett, later known as Syene, which in antiquity was the frontier town of Ancient Egypt facing the south. Swenett is supposed to have derived its name from an Egyptian goddess with the same name.^[10] This goddess later was identified as Eileithyia by the Greeks and Lucina by the Romans during their occupation of Ancient Egypt because of the similar association of their goddesses with childbirth, and of which the import is “the opener”. The ancient name of the city also is said to be derived from the Egyptian symbol for “trade”,^[11] or “market”.^[12]

Because the Ancient Egyptians oriented themselves toward the origin of the life-giving waters of the Nile in the south, and as Swenett was the southernmost town in the country, Egypt always was conceived to “open” or begin at Swenett.^[10] The city stood upon a peninsula on the right (east) bank of the Nile, immediately below (and north of) the first cataract of the flowing waters, which extended to it from Philae. Navigation to the delta was possible from this location without encountering a barrier.

The stone quarries of ancient Egypt located here were celebrated for their stone, and especially for the granitic rock called syenite. They furnished the colossal statues, obelisks, and monolithic shrines that are found throughout Egypt, including the pyramids; and the traces of the quarrymen who worked (alongside domesticated draft animals) in these 3,000 years ago are still visible in the native rock. They lie on either bank of the Nile, and a road, 6.5 km (4.0 mi) in length, was cut beside them from Syene to Philae.

Swenett was equally important as a military station and for its position on a trade route. Under every dynasty it was a garrison town; and here tolls and customs were levied on all boats passing southwards and northwards. Around 330, the legion stationed here received a bishop from Alexandria; this later became the Coptic Diocese of Syene.^[13] The city is mentioned by numerous ancient writers, including Herodotus,^[14] Strabo,^[15] Stephanus of Byzantium,^[16] Ptolemy,^[17] Pliny the Elder,^[18] Vitruvius,^[19] and it appears on the Antonine Itinerary.^[20] It may also be mentioned in the Book of Ezekiel and the Book of Isaiah.^[21]

Vitruvius. Okay. That is significant. 

On The Quarry

Some of the sites are well identified and the chemical composition of their stones is also well known, allowing the geographical origin of most of the monuments to be traced using petrographic techniques, including neutron activation analysis.

Magian was used to augment the Mineral Composites of Aswan. This is Plutus’ Magian Skills at work. I know that work too well. You build from Magian Resources and it does not fall. Which explains why Rome wanted it… They killed the Goose that laid the Golden Egg.

And there is The Message from this Clue.