Mangga -1 is located five kilometres west of the Anggur -3 well and about 20km east of the city of Surabaya in the Sampang PSC offshore East Java, Indonesia in 11m of water.

The well will test the Mundu Formation, which contains oil and gas in the Oyong oil and gas discovery, within a four-way dip closure, about 110m updip of gas shows in the Anggur -3 well, with drilling to be done by the Sedco 601 semi submersible drilling rig.

Mangga is assessed to have the potential to contain 110 billion cubic feet of recoverable gas (P50 case) up to a high side case of approximately 320 billion cubic feet of recoverable gas.

Participants in the Sampang PSC are Cue Sampang 15%, Santos (Sampang) 45% (operator) and Coastal Indonesia Sampang (El Paso) 40%.