 | Taylor, Cliff D., Finn, Carol A., Anderson, Eric D., Joud, M. Y., Taleb, M. A., Horton, John D. (2015) Algoma-, Superior-, and oolitic-type iron deposits of the Islamic Republic of Mauritania (phase V, deliverable 83): Chapter O in Second projet de renforcement institutionnel du secteur minier de la République Islamique de Mauritanie (PRISM-II). Open-File Report Vol. 2015 (2013-1280) US Geological Survey doi:10.3133/ofr20131280o | Report (issue) |
| number of new projects focused on lower grade magnetite ores in Algoma-type banded iron formation (or...terrane, and (4) the Saouda Group of the Inchiri district. Neoarchean Algoma-type BIF is present in the...Eizzene and Oumachouema Groups of the Inchiri district, (6) the Ijibbitene Group of the Ijibbitene massif........................... 48 5.2.5 The Inchiri district.................................................location of geochronology samples DB07RIM-46a (quartzite in lower member) and DB07RIM-46b (muscovite schist |
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| number of new projects focused on lower grade magnetite ores in Algoma-type banded iron formation (or...terrane, and (4) the Saouda Group of the Inchiri district. Neoarchean Algoma-type BIF is present in the...Eizzene and Oumachouema Groups of the Inchiri district, (6) the Ijibbitene Group of the Ijibbitene massif........................... 48 5.2.5 The Inchiri district.................................................location of geochronology samples DB07RIM-46a (quartzite in lower member) and DB07RIM-46b (muscovite schist |
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| CENTRAL MINNESOTA INCLUDING THE CUYUNA IRON-ORE DISTRICT BY E. C. HARDER AND A. W. JOHNSTON MINNEAPOLIS... 23 Descriptions of rock outcrops.............................. 30 Outcrops of silicic igneous rocks.... . . . . . . . . . . . . . . . .... . . . 40 Outcrops of subsilicic igneous rocks. . . . . . . . . ...counties. . . . . . . . . . . . . . . . . . . 52 Outcrops of slate, schist, and other metamorphic rocks...southern St. Louis counties. . . . . . . . 65 90 Outcrops of sandstone and other clastic rocks. . . . . |
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| an investigation of the chromite, platinum and magnetite deposits north of the Pilanesberg in the Western...pegmatitic pyroxenite, gabbro, ferrogabbro, dunite and magnetite, represents a separate intrusion. It was further...more than doubling the st.rike-Iength of the magnetite bands. INTRODUCTION The mafic portion of the...platiniferous }Ierensky Reef and the Bushveld magnetite occur within it. Activity on the chromitite and...from the strat'a converted carbonate bands into magnetite, chromitite and platiniferous rocks. ACKNOWLEDGMENT |
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| the beds ; for quartz, staurolite, fibrolite, magnetite, are infusible /minerals; muscovite and biotite...study of the phenomena of contact becomes in this region a study of " inclusions "; and the larger of the...the exceptional geological features of the region. f The region of Cruger's Point is continued northward...dark-coloured quartzose garnet rock, heavy with magnetite and containing some staurolite, resembling much...norite. Moreover, the norite contains a band of magnetite, exposed in a •working (near Mrs. Murden's) with |
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| . . . · . 11 Montreal magnetite-copper property . . . . . .11 Bawana magnetite-copper mine . . . . .... . . . .11 Maria magnetite-copper ore body . . . . . . . .11 Wah Wah Mountains deposits . . . . . . ...County . . . . . . . . . . . . · .23 Iron Springs district deposits . . . . . . . . . . . . . . . 23 Location... . . . . 31 9. Size and shape of Iron Springs district intrusions, from outcroppings and geophysical...porphyry, Iron Mountain. . 40 13. Iron-Springs district iron occurrences, Iron County . . . . . . . . |
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| ________________ Virginia - __ -__ _ ___________ Farmville district, Buckingham, Prince Edward, and Charlotte Counties...schist and gneiss. Kyanite schist _____ Kyanite quartzite ___________ ______________________ Hornblende...deposits Continued Virginia Continued Farmville district, etc. Continued Rock types Continued Other quartzose...localities North Carolina-South Carolina Kings Mountain district, Cleveland, Gaston, and Lincoln Counties, N.C...schist Manganiferous schist Kyanite quartzite Sillimanite quartzite Yorkville quartz monzonite. _._ Diabase |
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| T. Schaller, analyst. III. Pinal schist, Ray district, Arizona. Analysis made for Dr. F. L. Ransome..."Geology and Ore Deposits of the Breckenridge District, Colorado," Prof. Paper U.S. Geol. Surv. No. 75...alteration of monzonite porphyry in the Clifton-Morenci district as described by Lindgren, and Dr. A. C. Spencer...hydrothermal metamorphism of porphyry in the Ely district, Nevada. It is evident therefore that the chemical...determining the origin of a schist in a mining district is afforded by analysis III of Table II, hitherto |
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| Pavlides ............. STOP 1, 8 STOP 1A. Mineral district Chopawamsic Formation at Contrary Creek by J.E... Gair .............. 24 Ores of the Mineral district by J.R. Craig, J.W. Miller, L.J. Cox, and R.F...Betty Baker mine by J.E. Gair Drill core, Mineral district by J.E. Gair ................. ................of the Mineral district. STOP LA and STOP 2 shown 4. Geologic map of the Mineral district, Louisa County...of some major sulfide deposits of the Mineral district ...................... 29 2. Ore minerals of |
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| disseminated in schistose rocks - gold associated with quartzite - gold mineralization confined to conglomerates...classify the gold deposits and occurrences in the region with respect to their geological setting and host...~ Fig. 1. Geological sketch map of the Adola district Keys: 1.Cenozoic basalts, rhyolites and tuffs;...Transversal elements of the region of north-south orientation. I. Part of the region underlined by the Early...Precambrian crystalline basement (the eastern and western region). 11. The Gariboro granite gneiss domal structure; |
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| . . . . STRATIGRAPHY . . . . . III. OUTCROPS IV. PITCH V. AND STRUCTURE O F FORMATIONS...PLATES 110 113 115 116 I. INTBODUCTION. Our district (PL II) includes an exceptionally beautiful tract...length as Glen Lyon. The southern limit of the district approximately follows the divide between Glen...sea-level. Exposures are good throughout most of the region. Drift offers no serious difficulty to satisfactory...satisfactory mapping except in one critical region, near the south-western corner, north-east of Creag Ard (CA |
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| . . . . . . . . . . . . . . . . . . LORRAIN QUARTZITE . . . . . . . . . . . . . . . . . . . . . . ....SHEGUIANDAH COSBY TOWNSHIP BAR RIVER BELLEVUE GRENVILLE QUARTZITE . . . . . . . . . . . . . . . . . . . . . . ....writer examined a number of occurrences of Lorrain quartzite along the north shore of Lake Huron. Brief preliminary...occurs commonly as pegmatitic and vein quartz, quartzite, sandstone, and unconsolidated sand. Deposits...quarry, near Whitefish Falls, district of Sudbury, to supply quartzite for flux, and this single operation |
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| _______________ Chapter D. Geology of the Felch Mountain district, by Carl A. Lamey Introduction. ___________--...Chocolay group___ -----------------------Sturgeon quartzite-___________-----__--Occurrence and characteri...--------------Ferruginous quartz-mica schist and quartzite __________-__-_--------Feldspathic quartz-mica...al metamorphism_ -------------------Sturgeon quartzite.____________-_------Randville dolomite____ --... CONTENTS Chapter D. Geology of the Felch Mountain district Con page Structure _______-__-__________-___--____-_-_-__ |
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| as an intrusive into the Baraboo (Huronian?) quartzite. Cleavelandite dike apophyses in the advancing...type of xenolith. GBNBner-SrerpurNr The Baraboo quartzite is a pre-Cambrian inlier in the Paleozoicstrata...as a well known "canoe shaped" fold (1). The quartzite is probably Huronian in age. On the south margin...granite is shown here to be intrusive into this quartzite. Since this is a controversial question to which...considered the rock as part of the pre-Baraboo quartzite basement. Later Alden (3) quoted Steidtman to |
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| CEORC!A A FIW N T!SP!ECF VIEW OF THE WEISNER QUARTZITE, NEAR CARTERSVILLE , GEOllGlA l'LA'lE I GEOLOGICAL...the Cartersville District, Bartow County, Georgia. An Exposure of Weisner Quartzite along the Western...Cartersville, Bartow County, Georgia. View of Weisner Quartzite near Cartersville, Bartow County, Georgia. Log...Cartersville District. Sections S'lowing Structural Geology ot the Cartersville District. Map Showing...the Distribution Manganese Ore in Cartersville District. Section of the Openings on the Blue Ridge Mining |
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| Geology and Ore Deposits of the Itabira District Minas Gerais, Brazil GEOLOGICAL SURVEY PROFESSIONAL...341-C Geology and Ore Deposits of the Itabira District Minas Gerais, Brazil By JOHN VAN N. DORR 20 and...___________________________ Schists____________________________ Quartzite and meta-arkose(?)_________ Dolomitic schist ...46 47 49 49 50 51 Page Geology of the Itabira district Continued Structure Continued Folds in other ..._ Conceigao area_____________________________ District reserve estimate.._"______________________ Summary |
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| INTRODUCTION THE Pre-Cambrian terrain of Singhbhum district in Bihar and its adjoining areas of Keonjhar,...recognition of two distinct orogenic belts in this region and to the suggestion of a new correlation for...TEXT-FIG. 1.—Map showing the location of the Singhbhum region and the generalized structural trends in the Pre-Cambrians...FRAMEWORK OF THE REGION SOUTH OF THE COPPER BELT THRUST (a) Previous Work.—This region is characterized...undoubted Pre-Singhbhum granite metamorphics of this region were included by Dunn and Dey (1942) within their |
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| Keywords: Baraboo interval Dake Quartzite Laurentia The Statherian Baraboo Quartzite (1710–1650 Ma) is present...quartzites outcropping across the southern Lake Superior region. Collectively, these quartzites are known as Baraboo...Baraboo interval stratigraphy above the Baraboo Quartzite in the Baraboo Ranges is unresolved, limiting...unconformity. The lower sequence comprises the Baraboo Quartzite, Seeley Slate, and Freedom Formation. The upper...upper sequence comprises the Dake Quartzite and Rowley Creek Slate. The depositional age of the upper sequence |
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| of the replacement deposits - _______________ Magnetite deposits _______ Contact-metamorphic deposits... CONTENTS V Detailed descriptions Continued. Verde district Continued. Page Jerome-Verde Development Co 88...________ 92 Prospecting operations in the Verde district _ 93 Black Hills district____________________-_____-97..._____ Logan mine ________ ________ ____ Prescott district ____________________ ______ Geolpgy__ _.._____...district____________________________ Hassayampa district._____________________________ Big Pine mine__ |
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| VIII—Economic Geology 1. Limestones 2. Diatomite 3. Quartzite 4. Graphite 5. Radioactive minerals 6. Other minerals...—Minor fold styles 8 ,—Transverse profile of the region west of the River Kajiado 9 .•—Stereogram of structural...approximately 1,200 square miles in the Kajiado District of the Southern Province, bounded by latitudes...has an area of approximately 1,200 sq. miles. The region falls within the Southern Province, and the greater...greater part of it is administered by the District Commissioner, Kajiado. The north-eastern corner, beyond |
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| work Acknowledgments Authorship The Broken Hill district General description Location and physiography... . Statistical strike-dip-plunge relationships Region from De Bavay fault to Round Hill General statement...fault Alternative structural interpretations... Region from Zinc Corporation to White Lead General description...map to the principal geological structure of the district 1374 25. Zinc Corporation, section 10, showing...sillimanite-garnet gneisses with subordinate thin quartzite beds. These contain numerous folded sills of augen |
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| -------------------------------------183-218 MAGNETITE ORES____ -- ---------------------------------...----------------------183-185 Ti tanif erous Magnetite ores __________ -----------------------------...Georgia are red hematite and brown hematite. Magnetite is known to occur at several localities in the...Paleozoic area in association with the Weisner quartzite, Knox dolomite and Chickamauga limestone, (3)...the Rockwood formation, Upper Silurian in age; magnetite is found widely distributed in the igneous and |
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| Geology and Ore Deposits of the Rico District, Colorado GEOLOGICAL SURVEY PROFESSIONAL PAPER 723...723 Geology and Ore Deposits of the Rico District, Colorado By EDWIN T. McKNIGHT GEOLOGICAL SURVEY ...------------------------------------Location and geography of district -----------History --------------------------...ne and metadiorite --------------Uncompahgre Quartzite -----------------Early Paleozoic hiatus -----...dle Pennsylvanian Series -------------Larsen Quartzite -------------------Hermosa Formation --- - -------------Middle |
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| THE GEOLOGY OF THE CUYUNA DISTRICT, MINNESOTA: A PROGRESS REPORT UNIVERSITY OF MINNESOTA MINNESOTA...DIRECTOR BULLETIN 36 The Geology of the Cuyuna District, Minnesota A PROGRESS REPORT BY FRANK F. GROUT...F. Wolff, Sr., studied the mines of the Cuyuna district in considerable detail. About 1940 a brief synopsis...preparing a bulletin on the geology of the Cuyuna district, using as a basis Wolff's maps, structural cross...thirty-six years since the only major report on the district was prepared by E. C. Harder and A. W. Johnston |
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| 24W MAP OF TH E GIANTS RANGE GRANITE, POKEGAMA QUARTZITE, AND SURROUNDINGS, MINNESOTA Shows location of...Marquette district....................................... Southern Complex of the Marquette district............................................ Marquette region..................................................minerals of Keweenawan granite and other granites of region........................................................................... Sandstones of Felch district.............................................. |
