BHP has struck a deal to sell its 50% stake in the Samurai discovery in the US Gulf of Mexico to an unnamed private equity player.

The transaction would include BHP's 50% stake in Green Canyon blocks 432 and 476, as well as its 100% working interest in blocks GC 388, GC 431 and GC 475, the company said.

A BHP spokeswoman said that the company had originally opted into the prospect to strengthen its acreage position north of its Shenzi operations and to test the northern extent of the Wildling prospect.