Kennecott Utah Copper continues to be the star of the Rio Tinto Group as the worldwide company's top-earning mine for the second year in a row.

Mine officials announced Wednesday that the local copper mine earned $1.6 billion in 2007 and produced 292,800 tons of refined copper, over its previous year's production levels of 240,200. Kennecott also produced 523,000 ounces of gold and 4,364,700 ounces of silver last year, which surpassed some of the mine's previous record levels of metal production.

Kennecott produces 13 percent of the country's copper needs. The mine is 105 years old, but officials say Kennecott could be productive until 2036 with open-pit expansions and underground operations.