The Dangers of abandoned mines

Years ago, a mine may have a been a busy site where workes excavated one of America's keys to existence. However, now some of these mines have been shut down and are no longer in use (http://www.msha.gov/KIDS/ABANDON/SURFACE.HTM). This presents a safety hazard to the citizens of the areas around these abandoned mines. Many people have died from dangers such as falling rock, and falling into the mine from high ground. Also, much of the dirt is loose from the mining and can shift under the pressure of footsteps. Also, many of these mines have accumulated water, forming a swimming hole. There are many dangers that this presents, one being that people don't know the depth of the water, so diving in can cause injuries or even death. In addition, many times explosives have been left in these caves. This is very dangerous because as they age, they become easier to set off. I would imagine the government has some kind of guidelines for keeping a mining site safe to the public, however I am not sure what they are. Do any of you bloggers have an opinion on this issue and know of government policy regarding mine sites.