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Black Forest Mine (Missouri Monarch Consolidated mine), Spruce Mountain District, Elko Co., Nevada, USAi
Regional Level Types
Black Forest Mine (Missouri Monarch Consolidated mine)Mine
Spruce Mountain DistrictMining District
Elko Co.County

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Lock Map
Latitude & Longitude (WGS84): 40° 34' 1'' North , 114° 48' 41'' West
Latitude & Longitude (decimal): 40.56714,-114.81144
GeoHash:G#: 9rnqg3hbe
USGS MRDS Record:10046051
Locality type:Mine
Köppen climate type:BSk : Cold semi-arid (steppe) climate

Structure: Thrust Fault, Major N-S Fault

Alteration: Sericitization-Kaolinization

Deposit: Series of interlacing pipes or chimneys or chambers: replacement ore bodies along faults & fissures the black forest mine was first worked in the early 1870's, and intermittently thereafter. In 1904 the smelter at jaspar of the black forest smelting. And refining co. Turn out 700 bars of bullion As production continued. Wilson (1937) reported that prior to 1910 considerable ore from the black forest mine was mined and smelted on the property. In february 1916 the black forest mining and smelting co was incorporated, and re-incorporated in 1928 to operate the black forest mine. In 1929 the big 4 and keystone claims were added to their property holdings a long with and after the consolidation with the monarch mine which was effected in 1928. The new company was known As the missouri monarch consolidated mines company and operated continuously through 1937. Production records are scanty, but smelter returns on 30,000 tons mined from the black forest from 1919 to 1928 had a net return of $608,500. Most of the oxidized lead-silver ore above the 150 ft level came from a series of interlacing pipes or chimneys and chambers in white 1.s. This ore was shipped at this time (pre1928) to a.s. & r. Co. At murray, utah. The mine pre 1937 opened by 5-6 adits and over 7000 ft of workings with drifts, raises, stopes etc..the black forest-bronco tunnel is 2,700 ft and served for ore haulage, mining, and access; with its completion sometime before 1937. The ore occurs a long n W fault fissures, As replacement ore bodies in limestone (favorable), As chimneys, pipes and globular bodies 3 ft or more in diameter in closed in ferruginous casings. The mine is worked from 8 levels with over 10,000 ft of workings; many stopes are developed on major mineralized fissures. The ore is a fine-grained mixture of lead and copper carbonates and oxides with 20% lead and 20 oz. Of silver per ton. Sulfides begin to appear in the deepest workings of the mine. Mineral survey 4680, consisting of black forest, signal, forest, cave, atlantic, index, snowbank, fraction, rescue, windy point, long green, last chance, keystone, anaconda, empire claims. ; info.src : 1 pub lit discovery year: early 1870's

Deposit type: Polymetallic replacement

Development: First worked in the early 1870's, and intermittently thereafter. Prior to 1910, considerable ore was mined and smelted on the property. In feb., 1916, the black forest mining and smelting co. Was incorporated, and reincorporated in 1928. Further consolidation in 1929 led to the formation of the missouri monarch consolidated mines co., which operated continuously through 1937

Geology: Lamprophyric dike in upper tunnel some what altered

Ore(s): Faults, Shear Zone, Bedding Planes

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

6 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:

Formula: ☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: PbCO3
Reference: NBMG Bull 106 Geology and Mineral Resources of Elko County, Nevada
'Chlorite Group'
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: PbS
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: Al2(Si2O5)(OH)4
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: (Fe,O,OH,H2O)
Reference: U.S. Geological Survey (2005) Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Formula: Pb0.5Fe3+3(SO4)2(OH)6
Reference: NBMG Spec. Pub. 31 Minerals of Nevada
Formula: FeS2
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 2 - Sulphides and Sulfosalts
Group 5 - Nitrates and Carbonates
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
Group 9 - Silicates
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-

List of minerals arranged by Dana 8th Edition classification

Group 2 - SULFIDES
AmXp, with m:p = 1:1
AmBnXp, with (m+n):p = 1:2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-

List of minerals for each chemical element

H PlumbojarositePb0.5Fe33+(SO4)2(OH)6
H Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
H KaoliniteAl2(Si2O5)(OH)4
H Limonite(Fe,O,OH,H2O)
C CerussitePbCO3
O CerussitePbCO3
O PlumbojarositePb0.5Fe33+(SO4)2(OH)6
O Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
O KaoliniteAl2(Si2O5)(OH)4
O Limonite(Fe,O,OH,H2O)
Mg Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Al KaoliniteAl2(Si2O5)(OH)4
Si Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Si KaoliniteAl2(Si2O5)(OH)4
S PlumbojarositePb0.5Fe33+(SO4)2(OH)6
S GalenaPbS
S PyriteFeS2
Ca Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe PlumbojarositePb0.5Fe33+(SO4)2(OH)6
Fe Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
Fe Limonite(Fe,O,OH,H2O)
Fe PyriteFeS2
Pb CerussitePbCO3
Pb PlumbojarositePb0.5Fe33+(SO4)2(OH)6
Pb GalenaPbS

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]

Late Devonian - Middle Devonian
358.9 - 393.3 Ma

ID: 2865156
Carbonate Shelf Sequence - Limestone and minor dolomite

Age: Devonian (358.9 - 393.3 Ma)

Stratigraphic Name: Devils Gate Limestone; Guilmette Formation; Sultan Limestone

Description: Includes generally cliff-forming, thin- to thick-bedded limestone. These rocks are mainly shallow water subtidal, intertidal, and supratidal deposits formed on a broad inner carbonate shelf (Stewart, 1980). The Devils Gate Limestone and Guilmette Formation in northern Nevada are the principal units, and the Sultan Limestone is included from the southern part of the State. Unit is overlain (usually disconformably) by the Pilot Shale of unit MDcl except in southernmost Nevada where it is overlain by Mississippian carbonate (Mc). It depositionally overlies Middle and Lower Devonian unit Dcd. In a few places, such as southern Nevada and parts of Eureka County, regional mapping did not distinguish the Upper and Middle Devonian section from the Lower Devonian section, and all of the Devonian is included in unit Dc. Rocks mapped as the Simonson Dolomite would fit into this depositional sequence (sequences 9 and 10 of Cook and Corboy, 2004), but they are not differentiated from the underlying dolomites in White Pine or Elko Counties, so they are all included in unit Dcd here, not unit Dc. This unit crops out in Clark, Elko, Eureka, Lander, Lincoln, Nye, and White Pine 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:{limestone}, Minor:{dolostone}

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


Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Schrader, F.C., (1931), Spruce Mountain District, Elko County, U of N Bull, Vol. Xxv, No. 7
Hill, James M., (1916), Notes on Some Mining Districts in Eastern Nevada, USGS Bull 648
Wilson, C.L., (1937), the Geology of the Black Forest Mine Area, Spruce Mountain, Nevada, Thesis U. of Arizona

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