In 1957 when the Company was operating as Esso Eastern Inc., Mari Gas Field was discovered in Daharki, Sindh, Pakistan with original gas in place (GIIP) estimate of 2.38 TCF. Over the years with the phased development of the Field and the subsequent reservoir evaluations, the GIIP of the Field enhanced to 10.751TCF, thus making Mari one of the largest gas field in Pakistan in terms of balance reserves.

In May 1983 Fauji Foundation, a major Pakistani group, along with OGDCL and GOP acquired the entire business operations of Esso Eastern Inc. in Pakistan which comprised the Mari Gas Field.

During December 1984, the business was reorganized and incorporated as Mari Gas Company Limited (MGCL) which took over the assets, liabilities and operational control of Mari Gas Field.

MGCL primarily operated as a production company till 1997, developing the discovered Habib Rahi Reservoir in phases for supply of gas to the new fertilizer plants. Simultaneous with these development phases, the Company also pursued appraisal activities within its Mari D&P Lease by drilling stepout wells to determine the boundaries of Habib Rahi Reservoir.

The hallmark of MGCL’s growth and expansion is also represented by its entry into exploration activities in year 2001, on its initiative and with Government’s approval.

In its exploration segment, MGCL is operating total seven exploration blocks i.e. three exploration blocks (Ziarat, Hanna & Harnai) and one D&P Lease (Zarghun South) in Balochistan, two exploration blocks in Sindh (Sukkur & Sujawal), one in Khyber Pakhtunkhwa (Karak) and one in Punjab (Ghauri). In addition, the Company is also joint venture partner in two exploration blocks (Kohlu & Kalchas) in Balochistan, two exploration blocks (Kohat & Bannu West) in Khyber Pakhtunkhwa, one block (Zindan) in Khyber Pakhtunkhwa / Punjab and one block (Hala) in Sindh. Moreover, the Company is also joint venture partner in block 43B with 25% working interest in Oman with MOL.

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