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Henderson Mine, Dailey District (Jones Pass District), Clear Creek Co., Colorado, USA

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The Henderson ore deposit is located 3000 feet beneath the summit Red Mountain, about 10 miles west of Empire in the Dailey (Jones Pass) district. Access is from U.S. Highway 40 at Berthoud Falls.

The Henderson mine, which has produced molybdenum since 1976 (the deposit was discovered in 1964), is owned by Freeport-McMoRan. It is North America’s largest producer of primary molybdenum source. 2007 production was 40 million pounds of molybdenum.

The Henderson orebody is a blind deposit of about 300 mt (>0.2%) located deeper in the intrusive complex beneath the Urad orebody. Urad produced molybdenum during World War 1 and then again from 1967 to 1974 when the orebody was exhausted.

Both the Urad and Henderson deposits are associated with the Red Mountain Intrusive Center. This is an intrusive complex with more than 20 identifiable pulses of magma. The Henderson orebody was produced from 3 intrusive centers, all of which are hosted within the Urad porphyry. The Henderson - Urad ore deposit is a classic "Climax type" porphyry Mo deposit and many of the genetic characteristics recognized at the Climax mine were applied here from the initial exploration phase onward. The geology is well summarized by Shannon, et al. (2004)

Mining has occurred on 3 levels: 8100, 7700 and 7210. As of 2011 production is solely from the 7210 level.

Mineral List



47 entries listed. 39 valid minerals.

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Gunow, Alexander J., Ludington, Steve, and Munoz, J. L., 1980, Fluorine in Micas from the Henderson Molybdenite Deposit, Colorado, Economic Geology, 75:1127-1137.

Desborough, George A.; Mihalik, Peter (1980) Accessory minerals in the igneous host of molybdenum ore, Henderson Mine, Colorado. USGS Open-File Report 80-661.

Econ Geol (1988) 83: 266-296.

Eckel, Edwin B. (1997): Minerals of Colorado, updated & revised: 13.

Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Characteristics of alteration and mineralization in the Sharang porphyry molybdenum deposit in the northern margin of Gangdese and comparison with typical porphyry molybdenum deposits in the world. Geology and Exploration 47(1), 54-70.

Shannon, J.R., Nelson, E.P., and Golden, R.J. Jr., 2004, Surface and underground geology of the world-class Henderson molybdenum porphyry mine, Colorado, in Nelson, E.P. and Erslev, E.A., eds., Field trips in the southern Rocky Mountains, USA: Geological Society of America Field Guide 5, p. 207–218.

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