Dec 5 (Reuters) - BHP Billiton Plc BLT.L
* Submitted winning bid to acquire a 60 per cent interest in and operatorship of blocks containing Trion Discovery located in deep-water Gulf of Mexico
* Says PEMEX Exploration & Production Mexico (PEMEX) will retain a 40 percent interest in blocks
* Says PEMEX estimates gross recoverable resource to be 485 mmboe
* Says bid for Trion includes an upfront cash payment of $62.4 million and a commitment to a minimum work program (estimated to be up to a maximum of $320 million)
* Says should BHP and PEMEX agree to progress project beyond minimum work program BHP would be required to invest remainder of $570 million minimum work contribution
* Says should BHP Billiton and PEMEX agree to progress project beyond minimum work program BHP would also be required to invest a $624 million cash contribution
* Says BHP Billiton's bid also includes a commitment to an additional royalty of 4 pct Source text for Eikon: Further company coverage: BLT.L
(Bengaluru Newsroom)