Australia’s BHP Billiton this week staked its claim as Pemex’s first fully-fledged international partner via a farm-in to the deep-water Trion discovery, an offer valued at about $1.19 billion, writes Kathrine Schmidt.

In a bid event this week to determine the partnership, the diversified mining giant bested UK supermajor BP with a $624 million tie-breaking bonus offer, complementing a minimum contribution of $570 million.

“This