July 17, 2013
Pikeview Quarry, a century-old limestone quarry in Colorado Springs, has reopened four years after two massive rock slides forced it to shut down, according to a report from The Republic.
The first rock slide occurred in December 2008, when 2 million tons of limestone crashed down in the center of the quarry, forcing up a plume of dust. The second occurred in September 2009, when about 1 million tons of limestone fell and created a smaller plume of dust.
The quarry was monitored for several years using laser sensors and seismographs. Geologists and engineers also analyzed the area.
Experts have said the rock slides may have been caused by moisture build-up between the granite mountainside and the limestone covering it.
The quarry, which dates back to the 1900s, reopened earlier this year.