Now, the quarry--which is owned by Martin Marietta Materials--completed 2 million work-hours without an employee having to leave work due to an injury.
A program called Guardian Angel is responsible for the improvement. According to the Express-News, "each month 50 of the company's 500 San Antonio district employees take turns observing 10 co-workers each, noting potential problems and talking one-on-one about safety."
Employees receive incentives--such as fishing equipment and clothing--for offering suggestions to improve safety. The culture at the quarry has changed dramatically, and conversation about safety can be heard everywhere. Improvements in safety have also resulted in a 17 percent increase in productivity.