KARNES COUNTY -- Investigators from the Occupational Safety and Health Administration and the Railroad Commission of Texas arrived in Karnes County Wednesday to inspect a water pipe that burst Tuesday morning, injuring six workers in the explosion.

Four of the workers were airlifted to the burn unit at San Antonio Military Medical Center, while two other workers were driven from the site west of Falls City to nearby hospitals.

All six workers are expected to survive.

Three of the workers are employed by Sprint Safety, a Houston-based company that specializes in efficiency.

The other three injured workers are employed by Berry Bros. A spokesman for the company described Berry Bros. as a general oil-field contractor.

The I-Team has learned the oil rig belongs to Freeport McMoRan Oil & Gas, an offshoot of Freeport McMoRan Copper & Gold -- one of the largest materials companies in the world.

Texas Commission for Environmental Quality records indicate Freeport owns and operates 21 rigs in Karnes County, none of which have violations on record.

A majority of the oil rigs began operating just a few months ago.

A Freeport spokesman confirmed Wednesday the company owns an Indonesian gold mine -- in Papua -- that had a tunnel collapse back in May, killing 28 workers.

The accident prompted the Indonesian government to review safety measures at all of the country's mines.

Freeport also conducted its own safety review after the accident, before reopening the mine in June.

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