[2] Late Turkmen president Saparmurat Niyazov invited Chinese CNPC and Turkish Çalik Enerji to participate in the exploration and development of the Ýolöten field.

[6] In December 2009, the contracts to develop the field were awarded to CNPC, Hyundai Engineering and Petrofac.

[9] The gas field ranks among the world's five largest with estimated reserves of between 4 and 14 trillion cubic metres (140×10^12 and 490×10^12 cu ft) of natural gas and proven commercial reserves of 2.8 trillion cubic metres (99×10^12 cu ft).

[11] Galkynysh consist of Iolotan, Minara, Osman and Yashlar fields.

CNPC, Hyundai Engineering and Petrofac built gas processing plants.