West Mayacmas District, Mayacmas Mts (Mayacamas Mts), Sonoma Co., California, USA

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A Hg-mining area in the NE corner of Sonoma County, covering a mineralizaed zone about 20 miles long and 2 miles wide. The area trends NW along the border with Lake County.

The principal ore minerals are cinnabar and native mercury. Both are abundant and fill fractures and pore spaces in silica-carbonate rock or, to a minor degree, in chert. The ores were deposited by hydrothermal solutions rising along major shear zones, generally at contacts of serpentine and Franciscan rocks. The Geysers geothermal area is near the middle of the district.

Mineral List

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

Aegirine Alunite Alunogen Ammonioalunite (TL) Ammoniojarosite Azurite Baryte Boussingaultite Calcite Chalcopyrite 'Chert' 'Chlorite Group' Chromite Cinnabar Datolite Dolomite Edgarbaileyite Eglestonite

Epidote Epsomite 'Garnet' Gypsum Halotrichite Hisingerite Hydromagnesite Idrialite Jadeite Kalinite Kaolinite var: Chrome-Kaolinite Lawsonite Letovicite Magnesite Mascagnite Melanterite Mercury Metacinnabar

Metastibnite Millerite Montroydite Neotocite Omphacite Opal var: Diatomite Pecoraite Pectolite Pentahydrite Pickeringite Prehnite 'Psilomelane' 'Pumpellyite' Pyrite Pyrolusite Quartz var: Chalcedony

Rhodochrosite Riebeckite Riebeckite Group var: Crocidolite Sassolite 'Serpentine Group' 'var: Nickeliferous Serpentine' Stellerite Sulphur Talc Tiemannite Titanite Tremolite Tridymite Tschermigite Voltaite Vuagnatite Wairakite

71 entries listed. 60 valid minerals. 1 type locality (valid mineral).

Localities in this Region

USA California Sonoma Co. Mayacmas Mts (Mayacamas Mts) West Mayacmas District Black Oaks Black Oak Mine (E. H. Hacsela Mine) Buckeye Mine (Mount Vernon Mine) Cloverdale Mine Cornucopia Mine (Healdsburg Mine; Squaw Creek Mine) Dewey's Mine (Big Red Mine; Dewey Mine; Eagle Rock Mine) Kissack Mine (Squaw Mine; Amazon Mine; Big Chief Mine) Red Hill claim (Juniper Ridge; Lock; Lock and Key; Culver Bear) Sulphur Creek Esperanza Mine (Bright Hope Mine) Truitt No. 1 Mine Unnamed Cr occurrence (1) Unnamed Hg occurrence (2) Unnamed Hg occurrence (6) Unnamed Mn occurrence (2) Unnamed Mn occurrence (3) Castle Rock Springs area Anna Belcher prospect (Ann Belcher prospect; Lucky Stone prospect) Archambeau prospect (Lucky Strike) Bacon Consolidated Mine Baker Ranch property Boston group Cinnabar King group Contact Mine (Walker; Queen group) Crystal Mine (Red Cloud Mine; Pacific Mine; Abbey Mine) Denver and Hope Mine Eureka Mine (Flagstaff Mine) Foss prospect Great Northern prospect Jimtown Pine Flat Sonoma group (Sonoma Consolidated Mine; Old Sonoma; New Sonoma Mine; Crown Point Mine) Unspecified Asbestos occurrence (1) Unspecified Mn occurrence Jumbo Mine (B & M Mine; Double Star Mine) Last Chance and Young Denver Mine Lookout Mary Hurley occurrence (Hurley) McDonald prospect (McDonald property) Mericoma Mine Mohawk occurrence Napa Mine Occidental Mine Old Chapman occurrence Pacific group Paul Warner property (Warner claim; Big Bluff) Socrates Mine Sonoma Company No. 27 Mine Unnamed Mn mine (4) Warner and Clark claim Wheeler prospect Cloverdale Alberts Ranch Albertz Ranch deposit (Alberts Ranch deposit) Barnes Mine (Ardoin 1918) Battenburg Refractory Mine

USA California Sonoma Co. Mayacmas Mts (Mayacamas Mts) West Mayacmas District Cloverdale Black Ranch Brush deposit Burgans Ranch property (Burgaus Ranch) Curmings occurrence Healdsburg lode Kolling deposit (Creon deposit) Livermore Quicksilver Mine Melville Ranch Mercury Bank Mine North Fork Little Sulphur Creek Culver-Baer Mine (Culver-Baer Quicksilver Mine; Buckman Mine) Culver-Baer Mine area Unnamed Cr occurrence North of Cloverdale Russian River Pattenburg Refractory Magnesite Mine Shaw Ranch Shaw Mine Unnamed Hg prospect (19) Unnamed Magnesite deposit (1) Unnamed Magnesite occurrence (3) Unnamed Talc occurrence (1) Unspecified Ni occurrence (1) Yordi Ranch deposit (Ekert Ranch) Holst-Weeks prospect (Holst-Weeks deposit) Hood Mountain Regional Park Mount Hood Amphibole-Pyroxene occurrence (1) Mount Hood Mine Unnamed Perlite occurrence (1) Los Alamos Canyon Mahnke Peak Mark West Springs Alexander Valley Goodman Brothers deposit Mark West Shale Quarry (Mark West Shale pit and mill) Sharp prospect Unnamed Hg prospect (7) The Geysers Big Geyser property Black Bear Mine (Kentuck Mine; Buckman group) Commonwealth Consolidated Mine Devils Pulpit Unnamed Zeolite occurrence (3) Geyser Canyon (Geyser Creek Canyon) Upper Geyser Creek Canyon Witches Cauldron Geyser Quarry Lost Ledge and Mercuryville Divide Mine Rattlesnake Mine Unnamed Cr prospect (9) Unnamed Hg prospect (17) Unnamed limestone mine (1) Unnamed Mn occurrence (1) Unnamed S occurrence (2) Yellowjacket Mine

References