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    "label": "Report, Central Intelligence Agency, A Survey of the World Mercury Situation, Situation Report 28",
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    "id": "486500536",
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    "title": "Report, Central Intelligence Agency, A Survey of the World Mercury Situation, Situation Report 28",
    "citationUrl": "https://catalog.archives.gov/id/486500536",
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        "President's Secretary's Files (Truman Administration)",
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    "productionDates": [
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            "logicalDate": "1949-02-04",
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            "year": 1949
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{
    "seq": 38,
    "pageIndex": 0,
    "type": "photo",
    "url": "https://s3.us-east-1.amazonaws.com/NARAprodstorage/lz/presidential-libraries/truman/hst-psf/602196/875510/875510-02-038.tif",
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    "ocrText": "MERCURY THE WORLD\nCHART NO. III\nNo.\nName and Location\nOwnership and Nation-\nProduction\nORE DEPOSITS AND ORE RESERVES\nPRODUCTION METHODS\nTRANSPORTATION\non\nof Mine or Produc-\nality of Controlling\nYear\nFlasks of\nGeological and Mineralogical Notes and Ore Analysis\nand Plant Capacities\nLabor Employed\nMap\ning Area\nCapital\n76 pounds\nand Other Data\nCALIFORNIA (Cont'd.)\n11.\nOceanic Mine\nAmerican Quicksilver\nOre is of two types: (1) high-grade type is a medium\nExtensive underground workings,\n1938 40 men\n40 miles by road\nCo.\ngrained sandstone containing disseminated cinnabar;\nshafts, adits, and crosscuts.\nfrom San Luis Obis-\nUnited States Control.\n(2) is a sandy siltstone containing almond shaped\nShaft to 750 feet depth below out-\npo and 5 miles east\n\"nuggets\" of replacements of fossil shells by cinna-\ncrop, level interval 70 ft. in\nof Cambria. Alti-\nbar and some native mercury associated with the\nupper workings and 50 ft. in low-\ntude 500 ft. San\ncinnabar. The ore shoot has a maximum horizontal\ner workings. Mined by top slice\nLuis Obispo County.\nextent of 500 feet and a thickness of 15-40 feet.\nmethod. Ore is crushed in 2 Her-\nThe mine workings are in rocks of Miocene age.\ncules-Blake jaw crushers at the\nReserves total several thousand tons of low-grade\nportal of 400 level, transported\nore averaging 0.1 to 0.15% Hg.\nby 2,600 ft. aerial tramway to\nfurnace plant. Gould rotary fur-\nnace 75 ton per 24 hours, capaci-\nty, calcined ore trammed to dump\nin cars hauled by small gasoline\nlocomotive.\nCalifornia Prod.\n12.\nSocrates Mine\nContact Quicksilver Co.\nThe mine workings are along the sheared northern\nMine developed by 6,000 feet of\n6 miles southeast\nUnited States Control.\n1938\n12,277\ncontact of a serpentine dike which cuts the Francis-\nworkings on 4 main levels.\nfrom the Geysers, on\n1939\n11,127\ncan sandstone. Ore bodies occur along and beneath\nRotary furnace of 30 tons daily\nthe divide between\n1940\n18,629\nthe contact where native mercury is abundant in\ncapacity.\nBig Sulphur and\n1941\n25,714\ncracks and fissures in silica-carbonate rock, or is\nLittle Sulphur\n1942\n29,906\ndisseminated in the sandstone, and variable amounts\nCreeks. Sonoma\n1943\n33,812\nof cinnabar nearly everywhere accompanying the\nCounty.\n1944\n28,052\nnative mercury. Grade of ore varies considerably.\n1945\n21,199\nThe main ore shoot extends from the surface to a\n1946\n17,782\ndepth of at least 400 feet; its average length is\nabout 70 feet. It is rarely over 15 feet wide.\nThe second main shoot fingers out in depth. It was\n160 feet long at the surface and extended downward\nat least 250 feet. Most of the rich ore has been\nmined.\n13.\nMt. Jackson Mine\nSonoma Quicksilver\nThe ore shoots are steeply dipping pipes and tabu-\nMine developed by 6,720 feet of\n4 miles northeast\nMines, Inc.\nlar lodes, and are generally greatest in the verti-\nworkings on five accessible main\nof Guerneville in\nUnited States Control.\ncal dimension. They are enclosed in silica-carbon-\nlevels. Rotary furnaces of 100\nwest-central\nate rock. Cinnabar is the ore mineral. Grade of\ntons and 40 tons daily capacity.\nSonoma County.\nore is about 0.2% Hg. Reserves: Fairly large re-\nserves of measurable and indicated low grade ore.\nIn addition unexplored ground below old workings\nappears promising.\n14.\nGreat Eastern Mine\nMagee Mercury, Inc.\nThe ore shoots are steeply dipping pipes and tabu-\nDeveloped by about 5,280 feet of\n4 miles northeast of\nUnited States Control.\nlar lodes, and are generally greatest in the verti-\naccessible workings on 3 main\nGuerneville. Ad-\ncal dimension. They are enclosed in silica carbon-\nlevels. Rotary furnace of 80\njoins Mt. Jackson\nate rock. Cinnabar is the ore mineral. Grade of\ntons daily capacity.\nmine. Sonoma\nore averages 0.1 - 0.2% Hg. Reserves are small and\nCounty.\nof marginal grade.\nCONFIDENT"
}