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Soulsby Mine (Churchill; Johnson & Bradbury; Pennsylvania; Platt & Gilson), Soulsbyville, Soulsbyville & Confidence District, East Belt, Tuolumne Co., California, USA

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Latitude & Longitude (WGS84): 37° 59' 15'' North , 120° 15' 36'' West
Latitude & Longitude (decimal): 37.98750,-120.26000
Köppen climate type:Csa : Hot-summer Mediterranean climate


A former Au-Zn-Pb-Bi-Te mine located in the NW¼ sec. 31, T2N, R16E, MDM, 0.4 km (1,300 feet) NE of Soulsbyville, on private property. Discovered either in 1852 or 1856, depending on data source. Mining took place at least as late as 1911. MRDS database stated accuracy for this location is 500 meters. This group of claims included the Churchill, Johnson & Bradbury, Pennsylvania, Platt & Gilson, and Soulsby mines, which was the principal mine and was recorded in 1856.

The original mine was called the Soulsby, which was later consolidated with several other adjacent mines (Johnson and Bradbury, Platt, Gilson, Churchill). It is the largest producer in the East Belt of gold mineralization. Despite this standing, there is relatively little easily available information on this deposit.

Mineralization is a vein deposit (Model code 273; USGS model code 36a; deposit model name: Low-sulfide Au-quartz vein; Mark3 model number 27), hosted in Mesozoic-Paleozoic quartzite of the Calaveras Complex or Shoo Fly Complex, Jurassic granodiorite of the Standard pluton and Mesozoic diorite. The vein averages 15 inches in thickness. No local alteration reported. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

LOCAL GEOLOGY: The Soulsby Mine is developed mainly in a quartz-vein system, the Soulsby, which cuts granodiorite of the Jurassic Standard Pluton, a roof pendant of metamorphic rock of either the Calaveras Complex or Shoo Fly Complex, and diorite dikes. Julihn and Horton (1940) reported the metamorphic rock as quartzite. The vein system strikes N10W to N20W and has an average dip of about 80NE, although in places it is vertical or has a steep dip to the west. It averages about 18 inches in width where mined and consists of a single vein in the north part of the deposit, which then splits into two veins in the south part after the system enters the granodiorite body. Diorite dikes are reportedly present along the vein system, although their relationship to the ore is not clear from available reports on the deposit. Ore comprises native gold and auriferous sulfides (pyrite, galena, sphalerite, and chalcopyrite).

Mineralization also includes an unspecified Bi telluride (Sharwood).

Workings include underground openings. Workings consist of several shafts with associated drifts and some crosscuts. It may have reached a maximum vertical depth of about 750 feet. There are 2 main shafts at 800 and 900 feet deep by 1890, with extensive drifting and stopes.


Mineral List


8 valid minerals.

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

Tertiary - Lopingian
2.588 - 259.9 Ma



ID: 2747305
Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges)

Age: Phanerozoic (2.588 - 259.9 Ma)

Stratigraphic Name: Atolia Quartz Monzonite; Coxcomb Granodiorite; Holcomb Quartz Monzonite; Lar Quartz Diorite; Liebre Quartz Monzonite; Mount Pinos Granite; Palms Granite; Sands Granite; Teutonia Quartz Monzonite; White Tank Quartz Monzonite; Vermont Quartz Diorite; Cadiz Valley Batholith; Barcroft Granodiorite; Bass Lake Tonalite; Big Baldy Granite; Boundary Peak Granite; Bridalveil Granite; Burnside Lake Adamellite; Cabin Granodiorite; Cactus Point Granite; Carson Pass Tonalite; Cathedral Peak Granite; Clover Creek Granodiorite; Cottonwood Adamellite; Cow Creek Granodiorite; Dinkey Creek Granodiorite; Ebbetts Pass Granodiorite; El Capitan Granite; Evolution Basin Alaskite; Giant Forest Granodiorite; Half Dome Quartz Monzonite; Hunter Mountain Quartz Monzonite; Inconsolable Granodiorite; Isabella Granodiorite; Johnson Granite Porphyry; Knowles Granodiorite; Lake Edison Granodiorite; Lamarck Granodiorite; Leaning Tower Quartz Monzonite; Lebec Quartz Monzonite; Leidy Adamellite; Lodgepole Granite; Lookout Peak Tonalite; McAfee Adamellite; Mitchell Peak Granodiorite; Mono Creek Granite; Mount Clark Granite; Mount Givens Granodiorite; Pear Lake Quartz Monzonite; Paradise Granodiorite; Pellesier Granite; Pohono Granodiorite; Potwisha Quartz Diorite; Round Valley Peak Granodiorite; Sacatar Quartz Diorite; Sage Hen Adamellite; Sentinel Granodiorite; Stanislaus Meadow Adamellite; Taft Granite; Tamarack Leuco-Adamellite; Tejon Lookout Granite; Tinemaha Granodiorite; Tungsten Hills Quartz Monzonite; Ward Mountain Trondhjemite; Weaver Lake Quartz Monzonite; Wheeler Crest Quartz Monzonite; Whitney Granodiorite. Hunter Mountain Batholith; Inyo Batholith; Sierra Nevada Batholith. Bald Rock Pluton; Bucks Lake Pluton; Bullfrog Pluton; Cartridge Pass Pluton; Cascade Pluton; Dragon Pluton; Grizzly Pluton; Independence Pluton; Merrimac Pluton; Paiute Monument Pluton; Papoose Flat Pluton; Pat Keyes Pluton; Sage Hen Flat Pluton; Santa Rita Flat Pluton; Swedes Flat Pluton; Tuolumne Intrusive Suite; John Muir Intrusive Suite; Shaver Intrusive Suite; Palisade Crest Intrusive Suite; Scheelite Intrusive Suite; Fine Gold Intrusive Suite; Soldier Pass Intrusive Suite; Mount Whitney Intrusive Suite

Description: Mesozoic granite, quartz monzonite, granodiorite, and quartz diorite

Comments: Sierra Nevada, Death Valley area, Transverse Ranges and Mojave Desert. Primarily granodiorite, tonalite, quartz monzonite, and granite ranging in age from Late Triassic to Late Cretaceous. Includes some rocks as old as Permian and possibly a few as young as Tertiary. Three main periods of emplacement (Triassic, Jurassic, and Cretaceous); wide variety of rock types

Lithology: Major:{granodiorite}, Minor:{granite,tonalite,quartz diorite,quartz monzonite}, Incidental:{diorite, quartz syenite, quartz monzodiorite, gabbro, trondhjemite, monzonite, monzodiorite, pegmatite, alaskite, aplite}

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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References

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Goldstone, L. P. (1890), Soulsbyville mining district: California Mining Bureau. (Report 10): 10: 742-755.
Irelan, William, Jr. (1890b), Tenth annual report of the State Mineralogist: California Mining Bureau. Report 10, 983 pp.: 744.
Crawford, James John (1896), Thirteenth report of the State Mineralogist: California Mining Bureau. (Report 13): 13.
Turner, Henry Ward & F.L. Ransome (1897), Description of the gold belt; description of the Sonora sheet: USGS Geologic Atlas, Sonora folio (No. 41), 7 pp.
Turner, Henry Ward & F.L. Ransome (1898), Description of the gold belt; description of the Big Trees sheet, California: USGS Geologic Atlas, Big Trees folio (No. 51), 8 pp.
Sharwood, William J. (1907), Some associations of gold with pyrite and tellurides: Mining and Scientific Press: 94: 117-118.
Tucker, W. Burling (1916), Amador, Calaveras, Tuolumne Counties: California Mining Bureau. Report 14: 1-172; […(abstract): Geol. Zentralbl., Band 27: 396 (1922)]: 138.
Storms, William H. (1917), The Black Oak mine: Mining and Scientific Press: 114: 873-875.
Logan, Clarence August (1928), Tuolumne County: California Mining Bureau. (Report 24): 24: 38.
Cooper, J.R. (1962), Bismuth in the U.S.: USGS Mineral Resources map MR-22.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 312, 362.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 36 (map 2-22), 70.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10009199, 10034631, 10141699 & 10310683.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061090019.

 
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