Pulogsa operates a long-term concession for Puerto Central in San Antonio and owns and operates Puerto Lirquen in Chile's south.

The agreement is dependent on a tender to acquire all outstanding shares of Santiago stock exchange listed Pulogsa.

Dubai's DP World said it would offer $502 million for 100 percent equity ownership.

DP World, one of the world's largest port operators, said that Pulogsa had net financial debt of $226 million as of September 30 and that the transaction was expected to close in the first half of the year.

It also said it expected the deal to be "earnings accretive in the first full year of consolidation" and would be financed from existing balance resources.

(Reporting by Alexander Cornwell; Editing by Kim Coghill)