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Rosebud Mine (Hecla Rosebud Mine), Rosebud District, Pershing Co., Nevada, USA

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Latitude & Longitude (WGS84): 40° 48' 47'' North , 118° 39' 39'' West
Latitude & Longitude (decimal): 40.81306,-118.66083
GeoHash:G#: 9r785vcc6
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate


One of the highest grade gold and silver producers in Nevada, mined by a Hecla-Newmont joint venture between 1997 and 2000.

Harvest Gold has rights to over 1,000 acres surrounding the former Rosebud Mine and in 2011 completed a two-phase exploration program. As of 2013, no newer information is available, and it is assumed that development was not economical.

Mining Method: Overhand cut and fill method with access via a decline. Equipment was rubber-tired, including drill jumbos, rock bolters, 3.5-yard loaders, and 20-ton haul trucks. Typical ore panels were 14 feet high, 18 feet wide and about 80 feet long. These were backfilled with cementitious materials batched at the surface and hauled underground.

Geology: The deposit is part of a large, low-sulfidation hydrothermal system extending throughout most of the Kamma Mountains. Specifically, the deposit is a low-temperature epithermal, quartz-sericite, gold and silver deposit within Miocene andesitic and rhyolitic volcanics and volcaniclastics. The volcanics unconformably overlie a Jurassic/Triassic metasediment basement, which also hosts precious-metal mineralization.

Main structural elements include the east-west trending South Ridge Fault and the northeast trending Rosebud Shear, which displays up to 2,000 feet of left-lateral displacement and about 400 feet of normal displacement. The South Ridge Fault is a mineralized listric normal fault which acted as a conduit for mineralizing fluids.

Mineralization is therefore structurally and stratigraphically controlled. One mechanism takes place thrrough mineralization in the high-angle structures, along flow and bedding planes, and dissemination into specific andesitic volcanic or volcaniclastic facies, characterized by a clay-rich, silica-poor association with precious metals. Another takes place by silica-replacement in the rhyolite host at structures. Usually there is a combination of these at any location.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


12 valid minerals.

Detailed Mineral List:

Acanthite
Formula: Ag2S
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; Min News (2000) 16:10 pp 1,3-10
Baryte
Formula: BaSO4
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; Min News (2000) 16:10 pp 1,3-10
Calcite
Formula: CaCO3
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Gold
Formula: Au
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Marcasite
Formula: FeS2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Miargyrite
Formula: AgSbS2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; Min News (2000) 16:10 pp 1,3-10
Naumannite
Formula: Ag2Se
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Pyrargyrite
Formula: Ag3SbS3
Reference: Min News (2000) 16:10 pp 1,3-10
Pyrite
Formula: FeS2
Reference: NBMG Spec. Pub. 31 Minerals of Nevada; Min News (2000) 16:10 pp 1,3-10
Pyrrhotite
Formula: Fe7S8
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Stibnite
Formula: Sb2S3
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Wavellite
Formula: Al3(PO4)2(OH,F)3 · 5H2O
Reference: NBMG Spec Pub 31 Minerals of Nevada

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
'Gold'1.AA.05Au
Group 2 - Sulphides and Sulfosalts
'Acanthite'2.BA.35Ag2S
'Marcasite'2.EB.10aFeS2
'Miargyrite'2.HA.10AgSbS2
'Naumannite'2.BA.55Ag2Se
'Pyrargyrite'2.GA.05Ag3SbS3
'Pyrite'2.EB.05aFeS2
'Pyrrhotite'2.CC.10Fe7S8
'Stibnite'2.DB.05Sb2S3
Group 5 - Nitrates and Carbonates
'Calcite'5.AB.05CaCO3
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
'Baryte'7.AD.35BaSO4
Group 8 - Phosphates, Arsenates and Vanadates
'Wavellite'8.DC.50Al3(PO4)2(OH,F)3 · 5H2O

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 2:1
Acanthite2.4.1.1Ag2S
Naumannite2.4.1.2Ag2Se
AmXp, with m:p = 1:1
Pyrrhotite2.8.10.1Fe7S8
AmBnXp, with (m+n):p = 2:3
Stibnite2.11.2.1Sb2S3
AmBnXp, with (m+n):p = 1:2
Marcasite2.12.2.1FeS2
Pyrite2.12.1.1FeS2
Group 3 - SULFOSALTS
ø = 3
Pyrargyrite3.4.1.2Ag3SbS3
ø = 2
Miargyrite3.7.3.2AgSbS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 28 - ANHYDROUS ACID AND NORMAL SULFATES
AXO4
Baryte28.3.1.1BaSO4
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
A3(XO4)2Zq·xH2O
Wavellite42.10.2.1Al3(PO4)2(OH,F)3 · 5H2O

List of minerals for each chemical element

HHydrogen
H WavelliteAl3(PO4)2(OH,F)3 · 5H2O
CCarbon
C CalciteCaCO3
OOxygen
O BaryteBaSO4
O CalciteCaCO3
O WavelliteAl3(PO4)2(OH,F)3 · 5H2O
AlAluminium
Al WavelliteAl3(PO4)2(OH,F)3 · 5H2O
PPhosphorus
P WavelliteAl3(PO4)2(OH,F)3 · 5H2O
SSulfur
S AcanthiteAg2S
S BaryteBaSO4
S MarcasiteFeS2
S MiargyriteAgSbS2
S PyrargyriteAg3SbS3
S PyriteFeS2
S PyrrhotiteFe7S8
S StibniteSb2S3
CaCalcium
Ca CalciteCaCO3
FeIron
Fe MarcasiteFeS2
Fe PyriteFeS2
Fe PyrrhotiteFe7S8
SeSelenium
Se NaumanniteAg2Se
AgSilver
Ag AcanthiteAg2S
Ag MiargyriteAgSbS2
Ag NaumanniteAg2Se
Ag PyrargyriteAg3SbS3
SbAntimony
Sb MiargyriteAgSbS2
Sb PyrargyriteAg3SbS3
Sb StibniteSb2S3
BaBarium
Ba BaryteBaSO4
AuGold
Au GoldAu

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

Miocene
5.333 - 23.03 Ma



ID: 2984100
Younger rhyolitic flows and shallow intrusive rocks

Age: Miocene (5.333 - 23.03 Ma)

Stratigraphic Name: Cañon Rhyolite; Jarbidge Rhyolite

Description: Rhyolitic flows, domes, plugs, breccias, quartz latite, rhyodacite, quartz porphyry dikes, and other shallow intrusive rocks. This unit includes rocks mapped as the Cañon Rhyolite on the Washoe North map, the Jarbidge Rhyolite and phenorhyolitic and phenodacitic flows and domes on the Elko County map, and other unnamed units. It has a distribution similar to Tt3, with exposures in the northern and southern parts of the State, but only crops out in a few places in the central region. It corresponds to unit Tr3 on the 1978 State map, and also includes a few rocks mapped as Trt on the 1978 State map. This unit is exposed in every county except White Pine.

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:{rhyolite,hypabyssal quartz latite,dacite}

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]

Triassic
201.3 - 251.902 Ma



ID: 3184762
Mesozoic sedimentary rocks

Age: Triassic (201.3 - 251.902 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]

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Nevada Bureau of Mines and Geology (2000), Special Publication 31, Minerals of Nevada.
Mineral News (2000): 16(10): 1, 3-10.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID # 10222196 & 10104130.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID # 0320270781.

External Links



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