Caledonia Mining Company (CALVF) announced that is would product less gold than previously anticipated. This had the immediate effect of producing a large sell off in Caledonia Mining Common Shares. See Chart Below:
Caledonia Mining is a company that continues to under perform.
See the press release here: http://www.proactiveinvestors.co.uk/companies/news/73213/caledonia-mining-trims-production-forecast-as-grades-dip-73213.html