Operator ConocoPhillips has a 60% stake in the Caldita well, with Australia's Santos holding the remaining 40%.

In 2005, the partners said they had found significant hydrocarbons at the adjacent Caldita 1 well and suggested the field could contain more than 250 million barrels of oil equivalent.

Santos said that the Caldita 2 well has been plugged and abandoned as originally planned.

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