 | | Report (volume) | | and Bromargyrite in Volcanic Rocks near Silver Cliff, Colorado GEOLOGICAL SURVEY BULLETIN 1 J82-C ...and Bromargyrite in Volcanic Rocks near Silver Cliff, Colorado By FRED A. HILDEBRAND and ELWIN L. MOSIER...describes silver minerals, especially a new variety of cryptomelane, and explains why unmined silver ores...ores remain at the surface in this old mining district UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON................................................. Mining history ...................................... |  | | Book (edition) | | thrilled to the sight of mounted in gold or or silver, some lovely gem, against lying a background...associated with such rocks. Because hard rock mining amateur will usually get is tedious and expensive...recent perhaps because of the decline in placer mining for gold in made dis- faces helps to distinguish...mine, Racooche Valley, White Co. 1866 Vs White County Daniel Light form, % mi. NE Less than 1887 ...Alabama has yielded a 4i%4 carat diamond from Shelby County, 30 miles south of Birmingham, found about 1900 |  | | Book (edition) | | describes sites under of the nearest town and county. and the many maps included book contain such... — — A few gem materials notably, opal and obsidian are amorphous, lacking crystal structure altogether...fundamental clue to gem locations. Since hard-rock mining is too expensive for amateurs, the hobbyist ...Distribution Center in Denver Federal Center, Denver 25, Colorado. The centers supply on request a free index, from...are liable to welcome you with a gun," writes a Colorado collector. "As far as Texas is concerned," says |  | | Book (volume) | | ...........................................47 Colorado ................................................rights, so remember you were told. If in doubt, a county map will tell you who the legal owner is. Good...gemmy qualities for cutting and polishing. AUTAUGA COUNTY PRATTVILLE, N. 6 mi., and just E of the Birmingham...were well known to prehistoric Indians.) BARBOUR COUNTY BAKER HILL, SE 1 mi. : 1 in a deep ravine, as a...deep red to variegated⎯ocher. BIBB COUNTY GENERAL AREA: c county gravel pits along the Cahaba R.⎯gemmy |  | | Book (volume) | | ...........................................47 Colorado ................................................rights, so remember you were told. If in doubt, a county map will tell you who the legal owner is. Good...gemmy qualities for cutting and polishing. AUTAUGA COUNTY PRATTVILLE, N. 6 mi., and just E of the Birmingham...were well known to prehistoric Indians.) BARBOUR COUNTY BAKER HILL, SE 1 mi. : 1 in a deep ravine, as a...deep red to variegated⎯ocher. BIBB COUNTY GENERAL AREA: c county gravel pits along the Cahaba R.⎯gemmy |  | | Report (issue) | | .............................................. Mining, milling, and processing ........................perlite are described and brief mention is made of mining, milling, processing, economic factors, and reserve...dacitic perlite, welded tuff, pitchstone, and obsidian is included mainly to show the water content....occurrence of perlite as well as some features of mining, processing, and utilization are briefly stated...has this property been1 utilized commercially. Obsidian was reported to have been expanded and used in |  | | Book (volume) | | ...........................................59 Colorado ...............................................................548 Table of Maps Page Alabama County Map ...................................................................................4 Alaska County and Stream Map ..................................Co. Mining Districts ............................................................22 Arizona County Map.........................23 Arizona – Cochise Co. Mining Districts .................................... |  | | Book (edition) | | MARIN COUNTY FREE LIBRARY 3 1111 00289 4184 \ I s Fifth Revised Edition A complete, state-by-state...Maryland; Professor Richard Pearl of Colorado Springs, Colorado; and Professor Jack Hanahan of Belmont...microscope. A few gem materials notably opal and obsidian are amorphous, lacking crystal structure altogether...igneous rocks do not quite fit these categories. Obsidian, an extrusive rock, is a glass of much the same...same chemical composition as rhyolite. Pumice is obsidian in a powdery state. Much of the so-called wonderstone |  | | Journal (issue) | | to preserve and promote the unique geologic and mining heritage of Wisconsin while underscoring the importance...say the least. Obsidian Rock (SRM 278) SRM 278 consists of finely powdered obsidian rock obtained from...abandoned mine sites in the mountains of central Colorado. A unit of SRM 2780a consists of approximately...history are welcomed additions to my “mineral and mining memorabilia” collection. If you have some of these...become a reality. Figure 5 (Left) - Wisconsin Mining Display. Both are author’s images. Figure 6 (Right) |  | | Journal (issue) | | Keokuk geodes? By Jordan D. Marché II OBSESSED WITH OBSIDIAN 36 Knappers love this mineraloid with an edge...of my area. I’ve made some finds in northwest Colorado that a geologist has identified as selenite. On...the Pima County Board of Supervisors recognized that the beautiful, 90-year-old Pima County Courthouse...Revival architecture in the United States. The Pima County Board entertained the idea of creating a museum...mineral museum into the more accessible downtown Pima County Courthouse location. The university immediately |  | | Book (volume) | | 56 ct), Sweet Home Mine, Colorado; colorless scheelite (19.66 ct), Kern County, California; octagonal...Vivid blue matched benitoite gems from San Benito County, California, consisting of 52 benitoites and 75...events to bring the history of North American gem mining up to date. Here, then, is the latest, most complete...and interviews with persons actively engaged in mining gemstones. Pertinent references are furnished throughout... most likely in Canada. Systematic large-scale mining of sapphire-bearing gravels in Montana is beginning |  | | Book (edition) | | interesting facts about the people involved in mining, current price lists of various stones, and numerous...from the Tourmaline Q ueen .1ine, Pala, San Diego County, California. From a pen-and-ink drawing by W. E...information is included on the persons involved in mining the deposits, with dates and other pertinent information...Basalt Breccia, Hypersthene Gabbro, Hematite, Obsidian, Banded Rhyolite, Serandite, Datolite, Prehnite...Miners at Crystal Peak, Colorado 30. Pegmatite pocket, Crystal Peak, Colorado 31. Spodumene, Pala Chief |  | | Book (volume) | | Furcron, Chief Geologist of the Department of Mines, Mining and Geology; on the State of Michigan by Robert...Kobuk jade locality. Descriptions of San Diego County, California, gemstones and the mines in which they...the generous assistance of many residents of that county. My special thanks are extended to Elbert H. McMacken...Gabbro-Diorite, Lepidolite and Muscovite Mica, Obsidian, Banded Rhyolite, Pectolite, Datolite, i ) ...Hiddenite crystals Hiddenite crystal Map of Pala District Clays and crystals in pocket Vanderberg Mine Pile |  | | Journal (article/letter/editorial) | | Oligocene volcanic-tectonic basin near Silver Cliff, Colorado. Diameters of the megaspherulites range...rounded or spherical objects found in rhyolitic obsidian. They are usually composed of acicular crystals...large megaspherulites have been reported at Silver Cliff, Colorado (Cross 1891, 1896; Iddings 1909; Siems...consider them to be megaspherulites. The Silver Cliff volcanic district is located in the Wet Moun- Brought...MEGASPHERULITES tain graben of south-central Colorado, approximately 40 km southwest of Cañon City. |  | | Book | | HfiRIN COUNTY FREE LIBRfiRY 311110G386652Q I V Russell P MacFal A COLOR TREASUF FOR COLLECTORS...are 100 maps geared to leading the "hunter to his quarry" and more than eighty photographs of minerals in...to Hunting Locations ? i 9 GIVEN TO THE MARIN COUNTY LIBRARY BY MARI N L MTNF.RAT. SOCTETY DAVID...knapsack you can use a mountaineering bag or a mili- quarry or mine where a permit tary bag; make it it...Center. Geological Survey. Federal Center. Denver. Colorado 80225. Index sheets from which the condition |  | | Journal (article/letter/editorial) | | first phyllite we ever saw from sers" area, Sonoma County, Calif. It was noted by M. Vonsen in CALIF. JOUR... ranging in in a road cut situated in Randolph County, size from 2 to 4 millimeters. Sometimes it Ala...add, however, that there should ARIZONA—Native silver, small plates be no inference that the mode of...other recognized psilomelane in the Batesville district, In- species as laumontite, thomsonite, datolite...AND MINERALS Some nice specimens of iridescent obsidian have been received from H. H. Arends, Box 64, |  | | Journal (issue) | | experienced hobbyists alike to understand how jasper and obsidian are formed plus a review of their different types...villagesmithyopals.com Scan for more details ION Mining Cooperative Idaho, Oregon, Nevada Working hard...material to market. Spanish Stirrup Rock Shop Silver Streams Northwest T&J Rocks Plus Lori Lytle Coleman...Moss Drive, P.O. Box 740252 Houston Texas, TX 77074 USA Tel : +1 832 641 5014 ; +234 803 715 8372 Fax : +1...Workshop or Summer Camp at our facilities. Poland Mining Camps has obtained exclusive access for our customers |  | | Book (volume) | | SOUTHWESTERN QUADRANT Arizona, Arkansas, California, Colorado, Louisiana, Nevada, New Mexico, Oklahoma, Texas...Southwestern Quadrant Arizoni, Arkansas, California, Colorado, Louisicna, Nevada, New Mexico, Oklahoma, Texas...Location Numbers Arizona Arkansas California Colorado 258 Louis B30 ana HOW TO USE THIS BOOK...volumes, through very precise directions and accurate county maps, to get you to the best and most accessible...for the county in which it is located. This site number also appears under the given county in the text |  | | Journal (issue) | | Mine Gilman, Colorado Bob Werner werner@lcturboney.com After submit1ing the article, Silver Orefrom the...mine is located about 6 miles southwest of Ouray, Colorado and is situated in the rugged and beautiful San...San Juan Mountains of southwestern Colorado. The rich gold vein was discovered in 1896 by Thomas F. Walsh...million ounces of gold along with large amounts of silver, lead, copper, and zinc. Through careful development...turned the goldbearing vein into a very productive mining operation that was called the "Walsh Gold Engine |  | | Journal (volume) | | Chief Geologist Logan, District Mining Engineer W. Burling Tucker, District Mining Engineer Reid J. Sampson...Assistant District Mining Engineer Chas. V. Averill, District Mining Engineer J. C. O'Brien, District Mining...Statistician and Curator James M. Little, Junior Mining Engineer (Librarian) Elisabeth L. Egenhoff, Editor...Geology of Palm Springs-Blythe Strip, Riverside County, California, by William J. Miller Geology of Parts...Parts of tbe Barstow Quadrangle, San Bernardino County, California, by William J. Miller 9 11 73 Geology | | | Book (volume) | | rhoColorado; eolorless scheelite (19.66 cc), Kern Cowny, California;...Vivid blue matched benitoite gems from Sai, Benito County, California, consisting of 52 benitoites and 75...and interviews with persons actively engaged in mining gemstones. Pertinent references are furnished throughout... most likely in Canada. Systematic large-scale mining of sapphire-bearing gravels in Montana is beginning...Cantlin, Ellis, ID; Jeannette B. Carillo, Gen1 Center USA, El Paso, TX; Gary Christopher, The Prospectors Cache |  | | Journal (article/letter/editorial) | | however, we remove from an Ohio mound a glistening obsidian ob ject, or in far-off Florida find in another...vein quartz, novaculite, quartzite, flint and obsidian, all, when of fine quali ty, to be classed as...them were large: one near St. Charles, Saginaw County, was about nine feet long, three feet wide and...found large quantities of broken frag ments of obsidian, agatized wood, jas per, and other materials...inaccessible to the aborig ines, it contains native silver in specks or patches, the two metals being in close |  | | Journal (issue) | | MARCH 1939 Contents for March, 1939 CHIPS FROM THE QUARRY .......................................................................... FOSSIL RAINDROPS IN COLORADO ........................................ U.S...... SHATTERED CRYSTAL CAVITIES OF THE PATERSON DISTRICT. By W1n. C. Casperson ..........................Association 66 R OCKS AND MINERAL~ Chips ,from the Quarry low specks attracted our attention Under a magnifying...carrying on one of Los Angeles County's most a: ri\'e mining programs. The valley floor is covered ,vich recent |  | | Catalog/List | | Fairfield County, Branchville White xlline with cymatolite, good study ... New Mexico Taos County, near Dixon...cerium aluminum silicate California Los Angeles County, Pacoima Canyon Large black tabular crystals in...iron silicate ACTINOLITE California San Bernardino County, Wrightwood Green prismatic crystalline mass ....CROSSITE Sodium iron silicate California San Benito County, Gem mine Compact blue-gray mass with natrolite...sodium potassium alumino-silicate Arizona Final County, Christmas Dark green cleavages in andesite .. |  | | Book (edition) | | Localities Beaches Map of Oregon Beaches JACKSON COUNTY A Mineral Mecca Mop of Josephine and Jackson Counties...Counties General Ge::ilogy Fine Zeolites Gold Mining Region The Applegate Gem Rhodonite Area Copper Nuggets...Mountain JOSEPHINE COUNTY Josephinite Oregonite Althouse Creek CENTRAL OREGON Agate Cliff Mop, Orientafr:n...D;ggings Post District Antelope Locality County Quarry Brown's Ranch Crystal Hills Clarno Road Quarry Antelope...Mile Hill Sunflower Flat EASTERN OREGON Malheur County Sucker Creek Locality Skull Spring Fossils Mop |
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