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| OF PARTS OF THE NORTHWESTERN SAN JUAN MOUNTAINS COLORADO By W. S. Burbank and Charles T. Pierson UNITED...PARTS OF THE NORTHWESTERN SAN JUAN MOUNTAINS, COLORADO By W. S. Burbank and Charles T. Pierson This...PARTS OF THE NORTHWESTERN SAN JUAN MOUNTAINS, COLORADO CONTENTS Page Abstract.......................... Cochetopa area, Gunnison County....... Cebolla mining district, Gunnison County......................deposits ................... Upper Uncompahgre district, Ouray County....................... General geology |
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| Minerals of Colorado: A 100- Year Record By EDWIN B. ECKEL GEOLOGICAL SURVEY BULLETIN 1 1 14 A...knowledge____________________________________ Future of Colorado mineralogy______________________________________...mineral localities and metallic mineral deposits of Colorado ________________________________ In pocket III...mineral localities and metallic mineral deposits of Colorado, has not been included in this reprint. Many of...especially Fischer and others, 1946). MINERALS OF COLORADO: A 100-YEAR RECORD By EDWIN B. EcKEL ABSTRACT |
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| Rare-Earth Minerals in Powderhorn District, Gunnison County, Colorado By J. C. OLSON and S. R. WALLACE...PLATE 55. Generalized geologic map of Powderhorn district showing localities examined....____________________________...86. Index map of Colorado, showing location of Powderhorn district, Gunnison County, Colo_-__-__--_-_-_----_-_--_...Deposits showing abnormal radioactivity, Powderhorn district 700 704 707 718 A CONTRIBUTION TO ECONOMIC...RARE-EARTH MINERALS IN THE POWDERHORN DISTRICT, GUNNISON COUNTY, COLORADO By JERRY C. OLSON and STEWART R. |
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| Bromargyrite in Volcanic Rocks near Silver Cliff, Colorado GEOLOGICAL SURVEY BULLETIN 1 J82-C t V ...Bromargyrite in Volcanic Rocks near Silver Cliff, Colorado By FRED A. HILDEBRAND and ELWIN L. MOSIER CONTRIBUTIONS...silver ores remain at the surface in this old mining district UNITED STATES GOVERNMENT PRINTING OFFICE,................................................. Mining history .........................................south-central Colorado Map showing principal mining area of Silver Cliff-Rosita mining district and areas |
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| Geology of the Menominee Iron-Bearing District Dickinson County, Michigan and Florence and Marinette... Geology of the Menominee Iron-Bearing District Dickinson County, Michigan and Florence and Marinette Counties...-_------------Felch Formation ___________________ _ Vulcan Iron-Formation _____________ _ Traders and Curry...Post-Rand~ille folding __________________ _ Post-Vulcan folding ____________________ _ Post-Animikie folding...term "iron ore" ____________ _ History of iron mining ______________________ _ Future exploration and |
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| Menominee iron ranges, which were the impetus for mining and the resultant population growth in the area...Gogebic iron range, home of the well-known Montreal mine in Wisconsin. (My collecting experience has not...the town of Negaunee, and the first mine to open was the Jackson mine in 1845 (Boyum 1983).At that time...of the story, as they say, is history. Marquette County alone would eventually have 247 iron mines (Mulligan...labeling, however, was not the rule during much of the mining era here. Most specimens recovered in the early |
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| Geology Vol. 59, 1964, pp. 1094-1106 THE VULCAN IRON MINE, FORMATION IRON AT MOUNTAIN, JOHN T...syncline of Middle Precambrian Vulcan iron formation. At Groveland, the Vulcan Formation can be divided into...geology .................................. II. Vulcan iron formation ..................................1096 Basal Vulcan quartzite ........................................ 1098 Lower Vulcan ................ Middle Vulcan ............................................... 1098 1100 Upper Vulcan .......... |
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| Caldwell Stone Company quarry, Danville, Boyle County. Terry Huizing specimen and photo. K entucky...Commonwealth is Black Mountain in the Appalachians (Harlan County) at 4,139 feet. The lowest point is the floor of...of the Reed quarry near Grand Rivers (Livingston County) in western Kentucky, at 100 feet below sea level...small, nondiamondiferous kimberlite in Elliott County in eastern Kentucky and alnöite intrusions in Crittenden...described in Anderson (1994). The most widespread mining in Kentucky is coal. More than 7.4 billion tons |
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| . Program in Iron County ...................... Iron River-Crystal Falls district'......... General information...Aeromagnetic survey of Iron County 1 1 1 2 2 2 2 2 2 3 4 4 Page Program in Dickinson County..................... Menominee district ..................... General information.................. Character and succession...of program ................... Felch Mountain district................... General information..........parts of central Dickinson County ... Aeromagnetic survey of Dickinson County.. Regional problems .... |
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| South Dakota, and in the southwesternstates of Colorado, New Mexico, and Arizona. The major iron-formations...iron-formationin the Lake Superiorregionis in the Iron River district,where a 50foot bed containing35 to 40 percentpyrite...Arizona, (1911). This account,in turn, was updatedby Colorado,and New Mexico. Figure 1 showsthe Leith et al...Michigan(Aldrich gan (Cannonand Simmons,1973). Vermilion district, Minnesota: Northern Minneet al., 1965), where...Crystallinerocks, mostly origin of igneous origin district Mich. Basalt Sandstone and and breccfo Conglomerate |
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| WALCOTT, DIRECTOR THE MENOMINEE IRON-BEARING DISTRICT OF MICHIGAN BY WILLIAM SHIRLEY BAYLEY CHARLES...tongue Economic importance of the district Previous work in the district 35 Method of 33 35 36 - ...fold 239 Norway 240 fold Aragon fold West Vulcan fold Other secondary folds at southern margin Secondary... series 280 Distribution 283 Folding 284 Vulcan formation 285 Distribution 285 Topography ...Continued. Ujjper Menominee series — Continued. Vulcan formation Page. —Contiimed. members — Continued |
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| ...........................................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 .................................... |
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| 3PreliminaryReport on the geology of Franklin county, Pt. III, by H. P. CUSHING:Eighteenth Annual Report...75-128. With geological map. 441 442 REVIEWS county, New York. These are classified as Grenville (Algonkian)...occupy large areas. In the northern portion of the county, Upper Cambrian rocks overlie the pre-Cambrian... Elizabethtown, and Newcomb townships in Essex county, New York, and presents a geological map of the...found in small exposures over almost all of Warren county, and generally in the crystalline belt of Washington |
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| basis of detailed mapping in central Dickinson County; it consists of metamorphosed sedimentary and volcanic...accepted correlations with the strata of the Mesabi district of Minnesota, which have been traced into the...and equivalent rocks of older reports) and the Vulcan iron-formation, with the Traders, Brier, Curry...occur chiefly in the Iron River-Crystal Falls district, previously have been considered part of the Michigamme...Dickinson County (James, Lamey, Clark, and others), the Iron Eiver-Crystal Falls district (James, Pettijohn |
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| Lake Superior mining The Keweenaw copper district of Michigan 33 35 35 Copper mining on Isle Eoyal...and elsewhere Marquette iron district Menominee 38 39 iron district Crystal Falls, Florence, and...Gogebic iron district Vermilion iron district Mesabi iron district Accounts of the district before Opening...40 41 its opening 41 42 44 iron district Baraboo iron district Less important developments 45 ...., 45 Clinton iron ores of Dodge County, Wis 45 Paleozoic iron ores in western Wisconsin Iron ores |
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| ...........................................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 |
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| ...........................................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 |
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| ............................................. Colorado........................................................................................ 102 District of Columbia ....................................to refer to Geological Survey Bulletin 507, "The mining districts of the western United States," and to...abundant it may have been completely exhausted by mining or quarrying. Deposits of minerals that are widely...because they occur in sufficient quantity to warrant mining for their usual products, but because they furnish |
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| (CaBSiO4OH) vesicle filling from a basaltic Houghton County lava flow. Small specks of native copper occur...eventually led to one of the biggest and most important "mining booms" in this country's first century. Despite... the 1845 discovery of the Cliff Mine ( first in the world to mine native copper as its sole product)...instilled confidence in North Country mining and initiated the modern mining era. Choice 'Lake Copper' furnished...never documented by geologists working in the district during its decades of maximum activity. Hence |
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| Mountains Wilderness Study Area, San Bernardino County, California U.S. GEOLOGICAL SURVEY BULLETIN 1712-D...Mountains Wilderness Study Area, San Bernardino County, California By RICHARD J. GOLDFARB, DAVID M. MILLER...Mountains Wilderness Study Area, San Bernardino County, California. U.S. Geological Survey Bulletin 1712-D...California Desert Conservation Area, San Bernardino County, California. CONTENTS Summary Dl Abstract 1...Acknowledgments 5 Appraisal of identified resources 5 Mining and exploration history 5 Mines, prospects, claims |
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| T. J. Bornhorst, P. Brandes, R. Clark (Cliffs Mining Services Co.), B. C. Cornilsen, R. V. Dietrich...helpful suggestions throughout the project; to Ashton Mining of Canada, Inc. and Crystal Exploration, Inc.,...APPENDIX I: MICHIGAN MUSEUMS AND EXHIBITS FEATURING MINING, MINERALS, ROCKS, AND FOSSILS .......................243 APPENDIX II: MINERAL SPECIES LISTED BY COUNTY ...............................248 ABOUT THE AUTHORS...Oronto Group a.. 3: co w C: _J 0 0 Marquette Iron District, Baraga and Marquette Counties diabase dikes |
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| existence of a ferruginous graywacke formation with jasper and chert bands, called the Copps formation, separated...Animikie which are believed to be, as in the Gogebic district, below the Keweenawan. Leith ' R. C. Allen, "Correlation...Pre-Cambrian Formations of the Gwinn Iron-bearing District of Michigan," Jour. Geol., XXII (1914), 560-73...believed that the Huronian series in the Gogebic district comprises two unconformable series, the Upper...and H. L. Smyth, "The Crystal Falls Iron Bearing District of Michigan," Monograph 36, U.S. Geol. Survey |
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| Geology of Central Dickinson County Michigan GEOLOGICAL SURVEY PROFESSIONAL Prepared in cooperation...Conservation PAPER 310 Geology of Central Dickinson County Michigan By H. L. JAMES, L. D. CLARK, C. A. LAMEY...relations__ Conditions of deposition._-_____-_-__ Vulcan iron-formation.___.______________ Description ...Definition of "iron ore"_--_-----------------History of mining and exploration. _____ Occurrence and origin of...ore. _ _ General considerations____--_______-__ Vulcan iron-formation as low-grade ore____ Skunk Creek |
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| it helpful to refer to Survey Bulletin 507, "The mining districts of the western United States," and to...abundant, it may have been completely exhausted by mining or quarrying. Deposits of minerals of wide distribution...because they occur in sufficient quantity to warrant mining for their usual products but because they furnish...A. F. Rogers, Stanford University, Palo Alto. Colorado.........Prof. R. D. George, Boulder. Connecticut...See Bauxite and Hallpysite. Asbestos. Tallapoosa County, with corundum deposits near Dudleyville; not found |
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| which is hosted by the New Mexico Institute of Mining and Technology and organized by the New Mexico...San Pedro Mine in Santa Fe County, and along with his son Phillip is actively exploring the mine for minerals...minerals. The San Pedro Mine is perhaps best known for producing beautiful specimens of finely crystalline...Phillip have also developed a surface exposure at the mine to produce some very nice, single, sceptered quartz...during the last year: a presidential election in the USA, more lands closed to public use, mineral localities |
