The lower Chino quarries had been cut down to the surrounding grade, or somewhat lower, by 1927. An underground mine was started in 1930 and operated until 1986.
References
Eakle, Arthur Starr (1917), Minerals associated with the crystalline limestone at Crestmore, Riverside County, California: University of California Department of Geological Sciences Bulletin: 10: 327-360; […(abstract): Geol. Zentralbl., Band 29: 514 (1923)]: 334.
Rogers, Austin Flint (1918b), An American occurrence of periclase and its bearing on the origin and history of calcite brucite rocks: American Journal of Science, 4th. Series: 46: 584.
Daly, John W. (1933),Paragenesis of mineral assemblages at Crestmore, California (abstract): Pan American Geologist: 59: 312-313; […Geological Society of America Proceedings 1933: 1: 311 (1934); …American Mineralogist: 20: 638-659 (1935)]: 651.
Woodford, A.O., Crippen, R.A., and Garner, K.B. (1941) Section Across Commercial Quarry, Crestmore, California. American Mineralogist: 26: 352-381.
Jenni, Clarence M. (1957), Crestmore and its minerals: Gems & Minerals, No. 238: (July 1957): 64, 79.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 167, 288.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 173.
Forrester, Curt (2004) Large Clintonite Crystals from the Crestmore Quarry Riverside, California. Mineralogical Record: July/August, 2004.
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