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NEW ORLEANS -- Three years after the Deepwater Horizon spill, workers have dug up a massive tar mat found along the Louisiana coast.

The huge chunk of oil residue mixed with wet sand is about 165 feet long by 65 feet wide, according to the U.S. Coast Guard.

It was found under the surf off of Isle Grand Terre, about 90 miles south of New Orleans.

It weighs more than 40,000 pounds, though the Coast Guard says more than 85 percent of that is sand, shells and water.

Louisiana is the last state where BP is still cleaning up after the spill.

Earlier this month, BP and the Coast Guard said the clean-up was over in Alabama, Florida and Mississippi.

BP has reportedly recovered more than 2.7 million pounds of waste from Louisiana shores so far this year, with residual oil making up between 5 to 15 percent of the total weight.

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