Gebel Manzal el-Seyl is Early Dynastic volcanic tuff quarry . It was a place where was organised production of material for stone vessels in remote parts of the Eastern Desert by the Early Dynastic period (2920-2575 BC). This is when vessel production was at its peak in Egypt.
Sources:
- https://per-storemyr.net/2012/12/28/ten-quarries-of-ancient-egypt-6-gebel-manzal-el-seyl-volcanic-tuff-quarry/
- James A. Harrell, V. Max Brown and Masoud Salah Masoud, An Early Dynastic Quarry for Stone Vessels at Gebel Manzal el-Seyl, Eastern Desert. Journal of Egyptian Archaeology, vol. 86 - 2000, pp. 33-42
- James A. Harrell, A stone vessel quarry at Gebel Umm Naqqat: Egyptian Archaeology, vol. 24 -2004, pp. 34-36