The Mine Safety and Health Administration (MSHA) marked Memorial Day weekend  with its annual warning to outdoor enthusiasts who may stray — knowingly or otherwise — onto mine property.

MSHA says that each year, numerous children and adults are injured or killed while engaging in recreational pursuits at active and abandoned mine sites around the country.

In 1999, MSHA launched the public safety campaign “Stay Out–Stay Alive” (SOSA) to educate people unfamiliar with mining about the hazards that exist at sand and gravel pits, underground mines, and water-filled quarries.

“As schools begin letting out for the summer, there are more opportunities to explore the great outdoors,” said Joseph A. Main, assistant secretary of labor for mine safety and health.” We want our kids to stay safe and be aware that mines are not playgrounds.”

Thomas Jones, a star running back with the Kansas City Chiefs, joined forces as SOSA’s spokesman last year, and since then has delivered his safety message to school-age children, met with members of Congress to encourage their involvement, and taped several audio and video public service announcements. Jones, whose parents were coal miners in southwestern Virginia, admits to the lure of mine exploration during his early years.

“When you’re a kid, you’re adventurous and want to check out places like old mines and quarries,” said Jones. “We didn’t realize the dangers, and there were some close calls.”

“Thomas Jones is the ideal spokesman for the SOSA campaign,” said Main. “As a professional football player, he is a role model for children and can deliver the kind of message they will listen to.”

Abandoned underground mines may harbor hidden openings that drop hundreds of feet down. Rotting timbers and unstable rock formations make cave-ins a real danger. Lethal concentrations of deadly gases can accumulate in underground passages, and total darkness and debris add to the hazards.