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Longshot mine (Cottonwood Creek), Swales Mountain District, Elko Co., Nevada, USA

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Latitude & Longitude (WGS84): 40° 53' 31'' North , 116° 8' 33'' West
Latitude & Longitude (decimal): 40.89195,-116.14255
GeoHash:G#: 9rm2th5sf
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate


Structure: Roberts Mountain Thrust Fault Marked By Jasperoid

Alteration: Silicification, Fe Oxidation

Tectonics: Antler Orogen Overprinted By High Angle Basin And Range Extension.

Development: A 30 x 20' open pit reaching a maximum depth of 8; also a jig plant

Geology: A barite unit occurs in mudstones, cherts and limestones of the ordivician vinini fm. (?). The unit is 12' thick and strikes n10w, 40w. Part of the unit is good quality, the rest is comprised of gossan and jasperoid that contains some barite, and brecciated mudstone and igneous rock. The barite is the in bedded, yellow brown in color and fetid. Some large, radiating crystals are present locally and feoxs are abundant on fracture surfaces. Monor quartz is present.

Rock formation(s): Vinini Formation;Unknown Western Or Transitional Facies Carbonate



Structure: Roberts Mountain Thrust Fault Marked By Jasperoid

Alteration: Silicification, Fe Oxidation

Tectonics: Antler Orogen Overprinted By High Angle Basin And Range Extension.

Development: A 30 x 20' open pit reachin a maximum depth of 8; also a jig plant

Geology: A barite unit occurs in mudstones, cherts and limestones of the ordivician vinini fm. (?). The unit is 12' thick and strikes n10w, 40w. Part of the unit is good quality, the rest is comprised of gossan and jasperoid that contains some barite, and brecciated mudston and igneous rock. The barite is thein bedded, yello W briwn in color and fetid. Some large, radiating crystals are present locally and feoxs are abundant on fracture surfaces. Monor quartz is present.

Rock formation(s): Vinini Formation;Unknown Western Or Transitional Facies Carbonate


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


2 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

'commodity:Barite (Barytes)'
Reference:  
Baryte
Formula: BaSO4
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Chert'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Limestone'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
Quartz
Formula: SiO2
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada; U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Sandstone'
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
'Quartz'4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Baryte'7.AD.35BaSO4
Unclassified Minerals, Rocks, etc.
'Chert'-
'Limestone'-
'Limonite'-(Fe,O,OH,H2O)
'Sandstone'-

List of minerals arranged by Dana 8th Edition classification

Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
'Chert'-
'Limestone'-
'Limonite'-(Fe,O,OH,H2O)
'Sandstone'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
OOxygen
O BaryteBaSO4
O Limonite(Fe,O,OH,H2O)
O QuartzSiO2
SiSilicon
Si QuartzSiO2
SSulfur
S BaryteBaSO4
FeIron
Fe Limonite(Fe,O,OH,H2O)
BaBarium
Ba BaryteBaSO4

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]

Pliocene - Miocene
2.588 - 23.03 Ma



ID: 2983391
Younger tuffaceous sedimentary rocks

Age: Neogene (2.588 - 23.03 Ma)

Stratigraphic Name: Horse Camp Formation; Esmeralda Formation; Belted Range Tuff; Timber Mountain Tuff; Paintbrush Tuff; Crater Flat Tuff; Muddy Creek Formation; Siebert Tuff

Description: Tuffaceous and other young Tertiary sedimentary rocks. Most of these rocks are sedimentary with a strong volcanic component - a few are tuffaceous with a strong sedimentary component. This unit includes rocks originally mapped as the High Rock sequence in Washoe County; the Horse Camp Formation in northern Nye County; the Esmeralda Formation in Mineral and Esmeralda Counties; older lake beds in Lincoln County; the Belted Range Tuff; the Indian Trail Formation (now abandoned); Timber Mountain, Paintbrush, and Crater Flat Tuffs; Wahmonie and Salyer Formations in southern Nye County; the Siebert Tuff in Esmeralda County; the Muddy Creek Formation in Clark County; and the Thousand Creek and Virgin Valley “beds” in Humboldt County; and other unnamed units. It corresponds to units Ts3 and Tts from the 1978 State map. It is present in all counties.

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:{sedimentary,volcanic}

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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