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1961 January. Mining right acquired [Joomoonjin #116]
1963 May . Mining plan approved
1972 October. Joomoonjin Silica Sand Engineering established
1973 September. KS approved (KSL5100): the nation’s only KS (Korean Standards) sand
November. Began supplying silica sand to Samsung Coning
1992 September. Incorporated Joomoonjin Silica Sand Co., Ltd.
1996 October. Installed ferromagnetic separator
1999 December. Mining right acquired [Gangneung #35] & Mining approved
2002 March. Began exploitation at the block “Joomoonjin #116”
2013 November. Incorporated as a 100% subsidiary of Korea Railroad Industry Development Company
2014 January. Began exploitation at the block “Gangneung #35”