Black Forest Mine (Missouri Monarch Consolidated mine), Spruce Mountain Mining District, Elko County, Nevada, USAi

Regional Level Types
Black Forest Mine (Missouri Monarch Consolidated mine)	Mine
Spruce Mountain Mining District	Mining District
Elko County	County
Nevada	State
USA	Country

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

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Link to USGS MRDS:	10046051

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References