 Upon agreement concessions can also be granted to international mining firms such as U.S.-based Coeur d'Alene Mines and Apex Silver Mines, Ltd.In October 2006 co-op miners were involved in violence with miners from the state sector over control of a pewter mine which resulted in 16 deaths.Part of the ICM tax hike is to fund hiring more co-op miners into the state-owned mining company Comibol in an attempt to ensure that such violence does not repeat.