Danger looms in abandoned mines, so stay away

Bill Wilson

Wednesday, April 15, 2009 | 4:54 p.m.

Spring has sprung, and with it people are coming out of their winter lairs and into the great outdoors. Nicer weather means more hikers, campers, and mountain bikers. The mountains that surround our fair hamlet are a big draw for thousands of people from all over the world. Unfortunately these same mountains are peppered with abandon or inactive mines. Though exploring an old mine may be tempting for some, ignoring the potential danger it brings can be disastrous. The following are hazards that can be found in the abandon mines around Boulder City.

Shafts — The collar or top of a mine shaft is especially dangerous. The fall down a deep shaft is just as lethal as the fall from a tall building — with the added disadvantage of bouncing from wall to wall in a shaft and the likelihood of having falling rocks and timbers for company. Even if a person survived such a fall, it may be impossible to climb back out. The rock at the surface is often decomposed. Timbers may be rotten or missing. It is dangerous to walk anywhere near a shaft opening; the whole area is often ready and waiting to slide into the shaft, along with the curious. A shaft sunk inside a tunnel is called a winze. In many old mines, winzes have been boarded over. If these boards have decayed, a perfect trap is waiting.

Water — Many tunnels have standing pools of water which could conceal holes in the floor. Pools of water also are common at the bottom of shafts. It is usually impossible to estimate the depth of the water, and a false step could lead to drowning.

Ladders — Ladders in most abandoned mines are unsafe. Ladder rungs are missing or broken. Some will fail under the weight of a child because of dry rot. Vertical ladders are particularly dangerous.

Timbers — The timber in abandoned mines can be weak from decay. Other timber, although apparently in good condition, may become loose and fall at the slightest touch. A well-timbered mine opening can look very solid when in fact the timber can barely support its own weight. There is the constant danger of inadvertently touching a timber and causing the tunnel to collapse.

Cave-ins — Cave-ins are an obvious danger. Areas that are likely to cave often are hard to detect. Minor disturbances, such as vibrations caused by walking or speaking, may cause a cave-in. if a person is caught, he can be crushed to death. A less cheerful possibility is to be trapped behind a cave-in without anyone knowing you are there. Death may come through starvation, thirst, or gradual suffocation.

Bad air — "Bad air" contains poisonous gases or insufficient oxygen. Poisonous gases can accumulate in low areas or along the floor. A person may enter such areas breathing the good air above the gases but the motion caused by walking will mix the gases with the good air, producing a possibly lethal mixture for him to breathe on the return trip. Because little effort is required to go down a ladder, the effects of "bad air" may not be noticed, but when climbing out of the shaft, a person requires more oxygen and breathes more deeply. The result is dizziness, followed by unconsciousness. If the gas doesn't kill, the fall will.

Explosives — Many abandoned mines contain old explosives left by previous workers. This is extremely dangerous. Explosives should never be handled by anyone not thoroughly familiar with them. Even experienced miners hesitate to handle old explosives. Old dynamite sticks and caps can explode if stepped on or just touched.

Rattlesnakes — Old mine tunnels and shafts are among their favorite haunts — to cool off in summer, or to search for rodents and other small animals. Any hole or ledge, especially near the mouth of the tunnel or shaft, can conceal a snake.

Finally, please remember there is only one safe way to deal with abandoned mines- STAY OUT! For further information contact the Boulder City Fire Department 293-9228.

Bill Wilson, a firefighter-paramedic for the Boulder City Fire Department, can be reached at 293-9228.