Old Mines Are Dangerous!
Yikes! Wouldn't this be the surprise to stumble upon......

Mojave National Preserve (CA)
Explosives Found and Destroyed

On October 8th, a contractor working in the park came upon a metal silo at the Morning Star Mine which appeared to contain explosives. Rangers and the county bomb squad examined the silo and confirmed that it contained about 40,000 pounds of energized and active ammonium nitrate explosives. Around-the-clock security was begun and maintained at the site for nine days until the explosives could be destroyed. Rangers from Lake Mead, Santa Monica Mountains and the BLM assisted with the security. NPS explosives disposal experts from Yosemite and Sequoia-Kings Canyon destroyed the explosives in small amounts. The 40,000 pounds constituted about nine times as much of the same explosive as was used in the Oklahoma City bombing.
[Submitted by Kirk Gebicke, Park Ranger]