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Lyles Hectorite Mine (Lyles Hectorite deposit; Lyles deposit; White Hills Lithium prospect), Hillside, Thompson Valley, Yavapai Co., Arizona, USA

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Latitude & Longitude (WGS84): 34° 28' 58'' North , 112° 50' 29'' West
Latitude & Longitude (decimal): 34.48278,-112.84139
Köppen climate type:BSk : Cold semi-arid (steppe) climate

‡Ref.: Norton, J.J. (1965), Lithium-bearing bentonite deposit, Yavapai County, Arizona, USGS PP 525-D: 163-166.

Patterson, S.H. (1969) Clay, in: Arizona Bureau of Mines Bulletin 180, USGS Bull. 871: 329-330.

Elevatorski, E.A. (1978), Arizona Industrial Minerals, Arizona Department of Mineral Resources, Minerals Report No. 1, 70 pp: 59.

Eyde, Ted, Wilkinson, P.A.K., and Weiland, E.F. (1986) Field Trip to Selected Industrial Mineral Deposits of Arizona, in Beatty, Barbara, and Wilkinson, P.A.K., editors, Frontiers in Geology and Ore Deposits of Arizona and the Southwest. Arizona Geological Society Digest vol. XVI: 312-318.

Phillips, K.A. (1987), Arizona Industrial Minerals, 2nd. Edition, Arizona Department of Mines & Minerals Mineral Report 4, 185 pp.

Arizona Department of Mines & Mineral Resources, 1989, Directory of Active Mines in Arizona, Incorporating Sand and Gravel Operations (1989-1990): Arizona Department of Mines and Mineral Resources Directory 36, 14 pp.

Peirce, H. Wesley (1990), Arizona Geological Survey Industrial Minerals card file.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 244, 305.

USGS Bismarck Mesa Quadrangle map.

Arizona Department of Mineral Resources White Hills Lithium Propsect file.

State of Arizona Land Department Lease 7723000 and 7724200.

MRDS database Dep. ID #10110072, MRDS ID #TC10273; and, Dep. ID #10161985, MAS ID #0040251595.

A surface Li-bentonite clay deposit and mine located in the W.½ sec. 12, T.12N., R.6W., between Kirkland and Yava, near Hillside. Discovered in 1955 by Mr. Joseph Lyles of Yarnell, AZ. First produced 1986. Lease covers sec. 11 also. NOTE: Alternate coordinates provided: 34.525N, 112.8417W.

Mineral List

5 valid minerals.

Rock Types Recorded

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

Gelasian - Burdigalian
1.806 - 20.44 Ma

ID: 3019219
Pliocene to middle Miocene deposits

Age: Cenozoic (1.806 - 20.44 Ma)

Description: Moderately to strongly consolidated conglomerate and sandstone deposited in basins during and after late Tertiary faulting. Includes lesser amounts of mudstone, siltstone, limestone, and gypsum. These deposits are generally light gray or tan. They commonly form high rounded hills and ridges in modern basins, and locally form prominent bluffs. Deposits of this unit are widely exposed in the dissected basins of southeastern and central Arizona. (2-16 Ma)

Comments: In dissected basins of southeast and central Arizona

Lithology: Major:{conglomerate,sandstone}, Minor:{mudstone,siltstone,limestone,gypsum}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

5.333 - 23.03 Ma

ID: 2643460

Age: Miocene (5.333 - 23.03 Ma)

Description: Basalt flows, cinder cones, and minor dikes. Includes all compositions of basalt not proven to be alkali basalt. As such, percentage of outcrop defined as basalt, versus alkali basalt, is probably overestimated. Basalt in lower part of Thirteenmile volcanic rocks has an average K/Na ratio and is very Mg rich to Mg rich. Undated flows west of Kirkland and west of Martin Mountain range in composi­tion from basalt to andesitic basalt, are sodic to average in K/Na ratio, and are very Mg rich to very Fe rich. Basal part of Thirteenmile volcanic rocks may include some basalt that is equivalent to that in Hickey Formation. Individual flows 10–25 m thick

Reference: DeWitt, E., V. Langenheim, E. Force, R.K. Vance, P.A. Lindberg, R.L. Driscoll. Geologic map of the Prescott National Forest and the headwaters of the Verde River, Yavapai and Coconino Counties, Arizona. Scientific Investigations Map SIM-2996. [99]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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