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Overton Mine (Overton deposit), Moapa District, Clark Co., Nevada, USAi
Regional Level Types
Overton Mine (Overton deposit)Mine
Moapa DistrictMining District
Clark Co.County

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Lock Map
Latitude & Longitude (WGS84): 36° 29' 58'' North , 114° 28' 42'' West
Latitude & Longitude (decimal): 36.49972,-114.47861
GeoHash:G#: 9qqxdux4r
USGS MRDS Record:10221960
Locality type:Mine
Köppen climate type:BWk : Cold desert climate
Nearest Settlements:
Moapa Valley6,924 (2011)9.0km
Moapa Town1,025 (2011)22.8km
Bunkerville1,303 (2011)43.6km

T16&17S R67E. Horse Spring formation.
Deposit: General location: about 20 km SE of moapa. General size of ore body: medium

Regions containing this locality

North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

3 valid minerals.

Detailed Mineral List:

'Albite-Anorthite Series'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: CaMg(CO3)2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Feldspar Group'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: MgCO3
Reference: NBMG Bull 62 Geology and Mineral Deposits of Clark County, Nevada; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: SiO2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
Group 5 - Nitrates and Carbonates
Unclassified Minerals, Rocks, etc.
'Albite-Anorthite Series'-
'Feldspar Group'-

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Unclassified Minerals, Mixtures, etc.
'Albite-Anorthite Series'-
'Feldspar Group'-

List of minerals for each chemical element

C MagnesiteMgCO3
C DolomiteCaMg(CO3)2
O MagnesiteMgCO3
O DolomiteCaMg(CO3)2
O QuartzSiO2
Mg MagnesiteMgCO3
Mg DolomiteCaMg(CO3)2
Si QuartzSiO2
Ca DolomiteCaMg(CO3)2

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 Macrostrat.org

Quaternary - Miocene
0 - 23.03 Ma

ID: 3185380
Cenozoic sedimentary rocks

Age: Cenozoic (0 - 23.03 Ma)

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

66 - 145 Ma

ID: 3172227
Baseline Sandstone, red sandstone member

Age: Cretaceous (66 - 145 Ma)

Stratigraphic Name: Baseline Sandstone

Description: Red, purple-red, and yellow-tan quartz sandstone, fine to medium grained, well-sorted. Bedding 20 to 50 cm thick, commonly cross-bedded. Fluvial deposits are lithologically similar to and probably derived from Jurassic Aztec Sandstone (Ja). Overlies white sandstone member (Kbw) and intertongues laterally with Overton Conglomerate Member (Kbo). Crops out in northern part of quadrangle, in Valley of Fire and east of Overton Arm between Bitter Ridge and Wechech Basin. Thickness from 60 to about 600 m

Comments: Part of Baseline Sandstone (Upper? to Lower Cretaceous). White to red, fine- to medium-grained sandstone with minor lenses of conglomerate. Along with underlying Willow Tank Formation (Kw), comprises foreland basin deposits of the Sevier thrust belt in southeast Nevada. For more complete discussions, see Bohannon (1984) and Fillmore (1993). Discontinuously exposed in central part of quadrangle and in Wechech Basin beneath Tertiary deposits. Bohannon (1983) divided formation into the following members, all of which are exposed in the Lake Mead 30’ x 60’ quadrangle: (1) upper red sandstone member (Kbr) which intertongues northward with (2) Overton ConglomerateMember (Kbo) in Valley of Fire, both of which are underlain by (3) white sandstone member (Kbw), and (4) conglomerate (Kbc) at base of section in Gale Hills that underlies Kbw. K-Ar ages obtained by Carpenter and Carpenter (1987) on tuff include 96.9 ± 3.6 Ma and 95.8 ± 3.5 Ma from the white member and 93.1 ± 3.4 Ma from the red member, indicating a Cenomanian age. Baseline Sandstone is equivalent in age to Iron Springs Formation in southern Utah (Fillmore, 1993), and possibly the conglomerate of Brownstone Basin in the Muddy Mountains (Axen, 1985, Page and others, 2005).

Reference: Beard, L.S., R.E. Anderson, D.L. Block, R.G. Bohannon, R.J. Brady, S.B. Castor, E.M. Duebendorfer, J.E. Faulds, T.J. Felger, K.A. Howard, M.A. Kuntz, and V.S. Williams. Preliminary Geologic Map of the Lake Mead 30' X 60' Quadrangle, Clark County, Nevada, and Mohave County, Arizona. U.S. Geological Survey Open-File Report 2007-1010 version 1.0. [151]

66 - 145 Ma

ID: 2879704
Siltstone, shale, conglomerate, and limestone

Age: Cretaceous (66 - 145 Ma)

Stratigraphic Name: King Lear Formation; Newark Canyon Formation

Description: Includes detrital deposits of continental origin, and locally derived fluvial and lacustrine clastic rocks, some interbedded with siltstone and freshwater limestone. Outcrops are concentrated in three separate areas of the State. In each place, limited biostratigraphic data indicate these rocks are Cretaceous. The King Lear Formation in the Jackson Mountains in Humboldt County lies unconformably on Triassic and older rocks of the Black Rock-Jackson terrane. The Newark Canyon Formation crops out mostly in Eureka and White Pine Counties but extends into Elko and Nye Counties as well, and rests unconformably on Ordovician to Permian rocks. In places it is difficult to distinguish Upper Devonian, Pennsylvanian, and Permian clastic rocks also derived from the nearby underlying bedrock from the Newark Canyon Formation, and some confusion still exists. The Willow Tank Formation in Clark County lies unconformably on Jurassic rocks and is overlain by what was mapped as the Baseline Sandstone and Overton Fanglomerate (now referred to as the Overton Conglomerate Member of the Baseline Sandstone), all of Cretaceous age.

Comments: Original map source: Crafford, A.E.J., 2007, Geologic Map of Nevada: U.S. Geological Survey Data Series 249, 1 CD-ROM, 46 p., 1 plate; Scale 1:250,000.

Lithology: Major:{siltstone,shale,conglomerate}, Minor:{limestone}

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]

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


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Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Roberts, (1965), Geology and Mineral Deposits of Clark Co,
Nev. Bureau of Mines and Geol. Report 45, (1989), P. 10.

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