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Little Joe opal mine (Black Rock mine; Little Jo mine), Donnelly District, Humboldt Co., Nevada, USA

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Latitude & Longitude (WGS84): 41° 8' 14'' North , 119° 8' 59'' West
Latitude & Longitude (decimal): 41.13725,-119.14977
GeoHash:G#: 9r7608vcc
Locality type:Mine
Köppen climate type:Csb : Warm-summer Mediterranean climate


Calico Hills. Sec 5 T37N R25E.
Originally located by Ray Duffield. Subsequently acquired by David Pooley in the 1980s and renamed the Blackrock Opal Mine. Patented Mining claim; current ownership (2018) uncertain. Precious opal fills voids in basalt.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


1 valid mineral.

Detailed Mineral List:

Opal
Formula: SiO2 · nH2O
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Opal var: Precious Opal
Formula: SiO2 · nH2O
Reference: NBMG Spec. Pub. 31 Minerals of Nevada

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Opal'4.DA.10SiO2 · nH2O
var: Precious Opal4.DA.10SiO2 · nH2O

List of minerals arranged by Dana 8th Edition classification

Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Rocks, etc.
var: Precious Opal-SiO2 · nH2O

List of minerals for each chemical element

HHydrogen
H OpalSiO2 · nH2O
H Opal (var: Precious Opal)SiO2 · nH2O
OOxygen
O OpalSiO2 · nH2O
O Opal (var: Precious Opal)SiO2 · nH2O
SiSilicon
Si OpalSiO2 · nH2O
Si Opal (var: Precious Opal)SiO2 · nH2O

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

Neogene
2.588 - 23.03 Ma



ID: 3186305
Cenozoic volcanic rocks

Age: Neogene (2.588 - 23.03 Ma)

Stratigraphic Name: Columbia River Basalt

Comments: Columbia Plateau

Lithology: Flood basalt(s); mafic volcanic rocks; basalt

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]

Miocene
5.333 - 23.03 Ma



ID: 2981175
Basalt

Age: Miocene (5.333 - 23.03 Ma)

Description: Basalt flows, plugs and dikes, some olivine basalt, and andesite and latitic rocks. This unit corresponds with unit Tb on the 1978 State map. It is present on the Washoe North, Washoe South, Lincoln, Clark, Elko, Eureka, Humboldt, Nye South, and Lander County maps.

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:{basalt}, Minor:{andesite,latite}

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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