San Luis Obispo Co., California, USA

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References

Angel, Myron (1883), History of San Luis Obispo Co., Oakland.

Angel, Myron (1890), Kern, Monterey, San Benito, San Luis Obispo, Santa Barbara, Tulare Counties: California Journal of Mines and Geology, California Mining Bureau (Report 10): 10: 219-226, 345-348, 515-517, 567-585, 595-599, 728-733.

Fairbanks, Harold W. (1894), Geology of northern Ventura, Santa Barbara, San Luis Obispo, Monterey and San Benito Counties: California Mining Bureau. Report 12: 493-526.

Fairbanks, Harold W. (1895), On analcite diabase from San Luis Obispo County, California: University of California, Department of Geological Science Bulletin: 1: 273-300.

Von Leicht, F. (1899), Cinnabar in San Luis Obispo County, California: Mining and Scientific Press: 78: 482.

Mining and Scientific Press (1904), Cinnabar in San Luis Obispo County, California: Mining and Scientific Press: 89: 323.

Arnold, Ralph & Harry R. Johnson (1909), Sodium sulphate in Soda Lake, Carriso Plain, San Luis Obispo County, California: USGS Bulletin 380: 369-371.

Gale, Hoyt Stoddard (1914e), Sodium sulphate in the Carrizo Plain, San Luis Obispo County, California: USGS Bulletin 540: 428-433.

Logan, Clarence August (1919), San Luis Obispo County: California Mining Bureau. Report 15: 674-726.

Franke, Herbert A. (1935a), Mines and mineral resources of San Luis Obispo County, California: California Division Mines (Report 31): 31(4): 402-461.

Eckel, Edwin Butt, R.G. Yates & A.E. Granger (1941), Quicksilver deposits in San Luis Obispo County and southwestern Monterey County, California: USGS Bulletin 922-R: 538.

Smith, Clay Taylor & A.B. Griggs (1944), Chromite deposits near San Luis Obispo, San Luis Obispo County, California: USGS Bulletin 945-B: pp. i-iv, 23-44.

Smith, M.C. and Ricker, S. (1951) Chromite deposits: Sweetwater, Castro, Trinidad, New London and Hilltop mines, San Luis Obispo County, California. U.S. Bureau of Mines Report of Investigation 4783, 7 pp.

Berkholz, Mary Frances (1955), Aragonite crystals in San Luis Obispo County, California: Gems and Minerals, No. 212 (May 1955): 25-26.

Surdam, R.C. and Hall, C.A. (1968) Zeolitization of the Obispo formation, Coast Ranges of California. Geology Society of America Special Paper 101, abstract for 1966: 338.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 282, 306.

Surdam, R.C., Turner, D.L., and Hall, C.A. (1970) Distribution and genesis of suthigenic silicates in the Obispo formation. Geological Society of America Abstract, 2, No.2: 151-152.

Ernst, W.G. and C.A. Hall (1975) Feldspathic geodes near Black Mountain, western San Luis Obispo County, California. American Mineralogist: 60: 1105-1112.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 374, 377, 382, 441.

California Regional Water Quality Control Board, Central Coast Region (1993) Surface Water Degradation by Inactive Metal Mines in Northwest San Luis Obispo County, California, December 1993: 6-8.

Mineral List

Mineral list contains entries from the region specified including sub-localities

Albite Allophane Alunogen Analcime Antigorite 'Apatite var: Carbonate-rich Apatite' Aragonite Autunite Baryte Bieberite Blödite Calcite var: Limestone Onyx Calomel Cervantite Chalcopyrite 'Chlorite Group' Chromite Cinnabar 'Clay' 'Clinoptilolite' Copper Cristobalite Dolomite Epidote

Epsomite Erythrite 'Feldspar Group' Glaucophane Gold Gypsum Halite Hanksite Hausmannite Hematite Hercynite var: Picotite Hydromagnesite Jadeite Kaolinite 'K Feldspar' Lawsonite Limonite Linnaeite Magnesiochromite Magnesite 'Marble' Marcasite Melanterite Mercury Metacinnabar

'Mica Group' Millerite Mirabilite Mordenite Morenosite Natrolite Neotocite 'Olivine' Opal var: Diatomite 'Phillipsite' 'Porcelanite' Prehnite 'Psilomelane' 'Pumice' Pyrite Pyrolusite Pyrophyllite Pyrrhotite Quartz var: Agate var: Agate-Jasper var: Carnelian var: Chalcedony var: Chert

Quartz var: Moss Agate var: Myrickite var: Nipomo Agate Rhodochrosite Roméite Group var: Stibiconite Schröckingerite Schuetteite (TL) 'Serpentine Group' Siegenite ? Spinel Stibnite Talc Thenardite Tremolite Tridymite Turquoise Uraninite Vivianite Volkonskoite Wulfenite Zaratite Zippeite

101 entries listed. 69 valid minerals. 1 type locality (valid mineral).

Localities in this Region

USA California San Luis Obispo Co. Atascadero Davis Quarry Highway 41 Aragonite occurrence Millhollin pit (Santa Lucia borrow pit) Rocky Canyon Quarry Unnamed crushed stone quarry (1) Unnamed crushed stone quarry (2) Unnamed crushed stone quarry (3) Unnamed Quarry (5) Avila Beach Port Harford (Port San Luis) Black Mountain Carrizo Plain Soda Lake Soda Lake area Beck Quarry No. 4 California Valley Gypsum Mine Carrizo Plain deposits (Temblor Range Gypsite deposit) Chucker No. 3 Mine Farm Camp Quarry No. 5 (Farming Camp Mine) Fenceline Quarry No. 8 Miller Well No. 2 Mine Soda Lake deposit (Strip Mine) Unnamed gypsum location (1) Cholame Antelope Mud Company Mine Creston Grey Eagle Mine (Francis Cleaner Mine; Red Eagle Mine; Black Eagle claims; Golden State) Unnamed Au prospect (2) Cuyama Valley Unnamed Baryte occurrence Unnamed zeolite occurrence Fairview Mine Fellows area Mitchell property Owen group (Hillbilly No. 10; Owen No. 3; Mitchell; Sunset claims; Sunset claim) Unspecified U occurrence Harrington Mine Highland Monocline structure La Panza Mts 3 Bar 5 Ranch pit Creston Indian Creek Unnamed Apatite occurrence La Panza District Frazier Creek Hay Creek Unnamed Au placers La Panza American Canyon Area Placer prospect (Virginia) B.E. prospect Beartrap Creek Area Placer prospect (Morning Star placers) La Panza project prospect (Navajo Uranium prospect; Bethel No. 1) Machesna Mountain Roadless Area Review & Evaluation (RARE) II Area Morning Star Placer Mining Company Navajo Mines (Navaio Mines) Placer Creek Queen Bee Mine McGinnis Creek Navaho Creek Pozo Barbara Jane prospect Fraser Canyon prospect Gloria placer Hangout placer (Crystal J; Gold Nugget; Old Man's Folly; A-B-C-D; Mongoose; Edward Lee) Last Chance Placer Mine Pozo Creek Toro Creek Unnamed U occurrence Shandon Indian Creek San Juan Creek Shandon deposit Lake Nacimiento Oro Fino Placer Mine Unnamed diatomite prospect (3) Los Osos Arrisa Mine (Carrisa Mine) Ferrell deposit Incello Company property (Thompson Reid Estate; U.S. Refractories Company) Johe Ranch Mine (Johe Manganese deposit; Johe Ranch deposit; Irish Hills deposit) Los Osos Mine (Goodwill Mine) McKinney Iron Mines Red Rock pit San Luis Range Diatomite Mine Welch Mine Welch Mine (Noble Electric Steel Company Mine / property) Welch Ranch occurrence Morro Bay Guerra Quarry Rodrigues pit State highway 466 roadcut Unnamed Aragonite occurrence (1) Unnamed stone quarry (6) Nipomo Kolrich pit (Lompoc Quarry) Santa Maria Rock Company Mine Oceano Oceano Sand pit Paso Robles Mountain Springs Quarry Thompson deposit Pismo Beach Pismo Heights Company property Unnamed pumice occurrence (1) San Luis Obispo Barneberg Mine Bishop's Peak Quarry Dougherty Quarry East of San Luis Obispo Frank Tate Ranch pit Froom Ranch Mine (Froom Ranch deposit; Mrs. Froom's Chrome deposits) Goldtree Vineyard Mine Parker Red Rock pit Prefumo Canyon Staneuche Mine (Staneuche Manganese deposits; E.& W. deposits; East & West deposits) San Luis Brick Works Inc. Sousa Ranch deposit Unnamed chromite mine (3) Unnamed Co occurrence Unnamed diatomite deposit (1) Unnamed Gemstone occurrence Unnamed gravel pit (1) Unnamed Mn occurrence (1) Yoakum tract (Yoskum tract) San Rafael Mts Alano Creek deposits Front Door group Stanley Mountain Roadless Area Review & Evaluation (RARE) II Area Hilltop No. 4 prospect Southview prospect Santa Lucia Mts (Santa Lucia Range) Adelaide District (Adelaide Klau District) Adelaida Almaden deposit Cypress Mountain group Dubost deposit (Dubest deposit) Elizabeth and Winona group Fine Enterprises prospect (Tamley claim; Tamney group) Fitzhugh Ranch deposits (Benton Ranch) James Wheeler claims Kismet occurrence Klau Mine group La Libertad Mine (Belt Mine; Jacks 7X; Thompson Mine) Lime Mountain Quarry (Lime Mountain deposit; Dalessi; Limestone Mountain Quarry) Little Bonanza Mine (Modoc; Alice; George; Josephine group; Tartaglia) Madrone Mine Mayfield prospect Peppard Ranch deposit Unnamed Hg occurrence (2) Unnamed pumice quarry (3) William Tell occurrence (Williams) Alpha claim Arroyo Grande Arroyo Grande Creek deposit Caen Quarry (Houghton Quarry) Fugler Ranch Fugler Ranch Baryte deposit Grieb Ranch Quarry Isom prospect Newsome Marl deposit Steele Ranch Magnesite deposit Unnamed diatomite deposit (2) Unnamed limestone deposit (1) Unnamed pumice occurrence (2) Unspecified Allophane occurrence Big Bend claim Bluebird Mine Cambria-Oceanic District Cambria Bianchi Quarry Black Mountain area Black Mountain prospect Cambria Mine (Bank Mine; Red Hill workings; La Trinidad Mine) Cambria pit Fitzhugh Ranch Mine (Benton Ranch; Lehman; Leman) Gambrie Mine Gemstone Nos. 1; 2; & 3 Kiser Ranch Marquart Mine (Cambria Mine; Marquart Estate prospect) Moonstone Beach Mora Brothers Quarry Mount Butte Chromite property Oceanic Mine Phelan Ranch deposits Pine Mountain Rancho San Simeon pit Rogers Ranch occurrence San Simeon Creek San Simeon Creek Shell deposits Unnamed limestone deposit (2) Vulture Mine Warren prospect Wittenberg Ranch Mine Cayucos Bonanza group Cienega Creek Quarry Hazzard group Jitney Mine Kester prospect (Restor prospect) Mable G Mine Manini property Middlemast Ranch deposit (Middlecrest Ranch Chrome deposit) Muscio prospect Prodigal Son occurrence Ridge claim Santa Rita Stone Quarry Vollmer prospect (Quintano prospect) Whale Rock pit Zerfing Ranch deposit (Old Creek deposit) Cerro Alto Alfred H. Ruedy Chrome prospect Barbara claim Captian deposit Chromic Acid No. 1 claim (High Grade claim) Chromic Acid No. 2 claim Colonel deposit Eagle claim Eucalyptus No. 1 claim (Eucalyptus Mine) Eucalyptus No. 2 deposit Eureka claim (Leslie Elberg claim) Florence claim Hard Face Chromite Mine (Sunrise No. 2; Bluebird; Old Smoky) Hobson claims Leitner claim Little Bend group (Little Band group) Moonbeam No. 1 deposit Mountain View deposit Norcross Mine (West Norcross Mine; Brooklyn Mine; Manzanita; Biaggini Mine; Norcross Chrome Mine; Sunrise No. 3 claim; Victory No. 3 claim; Bernardo No. 3 claim) North Star claims San Ramon Mine (San Remon claims Nos. 1; 2; 3; & 4) Schweider and McCles claim Silver Swan Mine (Lonestar and Fern Mine) Spring Creek Chrome prospect Starlight Cr occurrence Sunrise No. 1 prospect Sunrise Nos. 1 and 2 deposits Sweetwater-Norcross group Tip Top deposit Sweetwater Mine (San Juan Mine; Pierce and Benadom group) Tassajara group (Tassajero group) Unnamed Cr property (4) Vulture Cr occurrence Chorro Castro Mine (Castro Chrome Mine; Trinidad Mine) Castro No. 2 claim (Castro group) Chorro Creek Refugio claim Unspecified Cu occurrence Colorado Mine Cuesta Pass Low Ranch deposit Pick and Shovel Mine (Pick A Shovel Mine; Safety Chrome Mine; Safety Mine) El Divisadero Mine (Eldivenfaro Mine) El Prinero Mine El Salto Mine Estrella Mine Hilltop claim Homeplace pit Jasper claim Johnson Ranch deposit La Primera Mine (El Primero Mine; Hardface Mine; La Primero Mine) Laflor claim Lanscioni prospect Lee Quarry Lucky Strike Mine Mescal Mine Mutual Chrome Mine (Mutual Chance Mine) New London Mine (London Mine) Niggerhead Mine O'Connor Ranch deposits (Mount Bishop Mine) Pick and Shovel group Chorro Mine (London Mine; Cypress prospect; Cypress Chrome Mine; Chorro Creek prospect) Rawhide Cr occurrence Questa prospect Rodilla Cr occurrence San Jose Valley Mine San Luis Obispo Nickel occurrence Santa Clara deposit Seeley group Central claims (Central claim) Climax claim Crown Point claim Liberty claim Lucky Jack claim Lucky Jake claim Mutual Climax Creek claim New Discovery claim Old Glory claim Ore Bag claim Outpost No. 1 claim Outpost No. 2 claim Spring Creek No. 1 claim Trout Creek No. 1 claim Trout Creek No. 2 claim Single Jack Mine Sunshine claims (Keeney; Alviso) Take a Chance group Trinidad Mine Unnamed chromite mine (2) Unnamed Ni occurrence (1) Cienaga Mine Egenes prospect First Chance Mine (Skyscraper Mine; Drought Mine) Harmony Hill prospect Land Red Rock pit Morro Bay prospect (Follet Ranch prospect) Rancho Santa Rita Mine Ricioli prospect Unnamed Mn occurrence (2) Huasna Deer Trail Mine Ezra Carpenter deposit Kessler Onyx deposit Lowe; Porter; et al Limestone deposit Morgan Limestone deposit Steele Ranch deposit (Rancho Santa Manuela) Unnamed Baryte deposit (1) Lopez Canyon group Los Berros Los Berros Canyon (Campedonico Ranch) Moore Quarry Lucky Jack group (Bonilla claim; Lucky Chrome claim; Lucky Davis claim; Lucky Jack claim; Lookout claim; Flores claim) Mello prospects Musick Mercury Belle Mine Rinconada Rinconada Mine (Rinconada deposit; Claus Mine; San Jose Valley) Unnamed Hg prospect (3) Unnamed Hg prospect (4) Unnamed Hg prospects (1) Unnamed Hg prospects (6) S. Aumaier deposit (Aumaler & Roderjues claim) San Carpoforo North Star and Sunset View Mine (Santa Maria Mine) Polar Star Mine (Santa Clara Mine; Black Hawk Mine; Polar Star No. 1 claim; Polar Star No. 2 claim) San Simeon Evans Manganese prospects Evans Ranch deposit Hearst Ranch Hearst Ranch-Marmolejo Creek deposit (Hearst Ranch prospect) Hearst Ranch - Red Rock deposit Pereira Group claims (Beauty Spot claim; Potrero claim; Red Rock claim; Ocean View claim) Pine Mountain claims (Old Timer Mine; Chisholm Mine) Porta Brothers Ranch claims Rancho Piedra Blanca occurrence Rogers San Carpojaro Creek deposits S. P. Dayton Ranch placer San Carpojaro Creek deposits (Arroyo La Cruz; Owl No. 1 and Owl No. 2 deposits) Tobacco Creek prospect (Tobacco Creek Mine) See Canyon Unnamed Phosphate occurrence Serrano prospect Unnamed Cr occurrence (1)

USA California San Luis Obispo Co. Santa Margarita Kaiser-Santa Margarita pit (Kaiser-Santa Margarita Quarry; Southern Pacific Quarry; Walter B. Roselip Quarry) Santa Lucia Range summit Santa Margarita Platinum occurrence Santa Margarita prospects Santa Margarita Quarry and Mill Santa Margarita Ranch Shell Deposit Mine Tip Top Mine (Tiptop Mine; Guerro Mine; Guadalupe Mine; Tassajara Mine; Gloria Mine) Unnamed Au prospect (1) Unnamed crushed stone quarry (4) Unnamed feldspar-mica prospect (1) Unnamed Hg prospect (5) Unnamed limestone deposit (3) Shell Beach Los Penascos Ranch deposit (Los Pemascos Ranch deposit) Taylor Spring South of Taylor Spring Temblor Range Wolforth Quarry No. 1