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The dive confirmed that the ship had not been disturbed since 1991 when another company stopped recovery work, Tampa-based Odyssey Marine Exploration announced. The ship's sinking in 1857 with 21 tons of gold aboard in a hurricane off the coast of South Carolina sparked a US banking panic.
Recovered gold included five gold ingots and two $20 Double Eagle coins, an 1857 coin minted in San Francisco and an 1850 coin minted in Philadelphia. The gold ingots were stamped with the manufacturer's "assay-mark" and weigh from 96.5 to 313.5 troy ounces.
US $20 Double Eagle coins fetch an average of $5000 from collectors, Odyssey's chief operating officer Mark Gordon told Reuters last week.
In March, Odyssey won the rights to return to the shipwreck from a receiver who had been appointed by an Ohio court to represent the ship's first exploration company after a decades-long court battle over rights to the treasure and return for investors
Only about 5 percent of the shipwreck site was explored in the late 1980s, Gordon said.
The two-hour reconnaissance dive in mid-April took place as the company's research vessel, Odyssey Explorer, was traveling from the U.K. to Charleston, the company revealed on Monday.
Odyssey Explorer left Charleston recently to begin the bulk of recovery work at the shipwreck 160 miles off the South Carolina coast and 7,500 feet (2.2 kilometers) deep.
The 280-foot (85 meters) sidewheel steamship carried as much as 21 tons of gold ingots, freshly minted gold coins and raw gold from the California mines, as well as the personal wealth and belongings of its 477 passengers, most of whom were lost when the ship sank.
Historians say the loss of the gold caused a banking panic that contributed to a larger US economic crisis, called the Panic of 1857, that lasted several years.