A Text-book of Ore and Stone MiningGriffin, 1897 - 744 Seiten |
Im Buch
Ergebnisse 1-5 von 91
Seite 10
... yards , is a smooth flat polished surface , with small striæ , precisely like the scratchings produced upon rocks by the action of glaciers . In this particular case the striations are horizontal ; more frequently they are inclined ...
... yards , is a smooth flat polished surface , with small striæ , precisely like the scratchings produced upon rocks by the action of glaciers . In this particular case the striations are horizontal ; more frequently they are inclined ...
Seite 20
... yards long by more than 30 yards wide , and the whole of the stanniferous stone is quarried and stamped . * EXAMPLES . — These abstract definitions are not sufficient ; the student should see how they can be applied to particular cases ...
... yards long by more than 30 yards wide , and the whole of the stanniferous stone is quarried and stamped . * EXAMPLES . — These abstract definitions are not sufficient ; the student should see how they can be applied to particular cases ...
Seite 27
... yards , and a length of a quarter of a mile or half a mile along their strike ; the depth to which the alteration of the granite continues is quite unknown . The veins are often tin - bearing , and workings for tin have led to the ...
... yards , and a length of a quarter of a mile or half a mile along their strike ; the depth to which the alteration of the granite continues is quite unknown . The veins are often tin - bearing , and workings for tin have led to the ...
Seite 30
... YARDS 328 METRES planes of bedding or in cross joints . Finally there may be small nodules of copper ore lying singly . The whole of the bed of copper shale is ore - bearing ; but , as a rule , only the bottom 3 or 4 inches are rich ...
... YARDS 328 METRES planes of bedding or in cross joints . Finally there may be small nodules of copper ore lying singly . The whole of the bed of copper shale is ore - bearing ; but , as a rule , only the bottom 3 or 4 inches are rich ...
Seite 48
... yards long by 170 yards wide . Mr. Jack considers that the deposit is the product of a geyser , and he explains his views by the section ( Fig . 39 ) . This naturally represents the present condition of the hill , much of the original ...
... yards long by 170 yards wide . Mr. Jack considers that the deposit is the product of a geyser , and he explains his views by the section ( Fig . 39 ) . This naturally represents the present condition of the hill , much of the original ...
Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
adit attached belt boring Boryslaw bottom bucket cage carbonic acid carried cast-iron cent clay coal compressed air Comstock lode copper Cornwall crushed cylinder Davy lamp deposit depth district drawn drill driven drum employed engine excavation explosives feet fire-damp galena gold ground gypsum holes horizontal inches in diameter inclined Inst iron pyrites ironstone ladders lamp limestone lode lower machine machinery magnetic main rod Mansfeld Mechernich metal method metres mineral mines ordinary ozokerite particles passes phosphate piece pipe piston plate plunger pressure produced pulley pumping quantity quarries quartz revolving rock roof rope sandstone SCALE screw separate shaft shale side sieve sinking slate sometimes specific gravity steam steel stone stroke sulphur surface thick timber tube tunnel underground valve veins ventilation vertical waggon washing wheels whilst winding wire wire rope wooden yards
Beliebte Passagen
Seite 53 - KNOW YOUR OWN SHIP. BY THOMAS WALTON, NAVAL ARCHITECT. Specially arranged to suit the requirements of Ships' Officers, Shipowners, Superintendents, Draughtsmen, Engineers, and Others. This work explains, in a simple manner, such important subjects as: — Displacement. — Deadweight.— Tonnage.— Freeboard. —Moments. — Buoyancy.— Strain Structure.— Stability.— Rolling.— Ballasting. — Loading. — Shifting Cargoes. — Admission of Water.— Sail Area.
Seite 43 - The Micro-Structure of Metals and Alloys. — Economic Considerations. " No English text-book at all approaches this in the COMPLETENESS with which the most modern views on the subject are dealt with. Professor Austen's volume will be INVALUABLE, not only to the student, but also to those whose knowledge of the art is far advanced.
Seite 31 - I. — ALKALIES AND ALKALINE EARTH METALS : Magnesium, Lithium, Beryllium, Sodium, Potassium, Calcium, Strontium, Barium, the Carbides of the Alkaline Earth Metals. PART II. — THE EARTH METALS: Aluminium, Cerium, Lanthanum, Didymium. PART III. — THE HEAVY METALS: Copper, Silver, Gold, Zinc and Cadmium, Mercury, Tin, Lead, Bismuth, Antimony, Chromium, Molybdenum, Tungsten, Uranium, Manganese, Iron, Nickel, and Cobalt, the Platinum Group. " COMPREHENSIVE and AUTHORITATIVE ... not only FULL of VALUABLE...
Seite 9 - We are of opinion, therefore, that the term as used in the acts of Congress is applicable to any zone or belt of mineralized rock lying within boundaries clearly separating it from the neighboring rock.
Seite 33 - NYSTROM'S POCKET-BOOK OF MECHANICS AND ENGINEERING. Revised and Corrected by W. DENNIS MARKS, Ph.B., CE (YALE SSS), Whitney Professor of Dynamical Engineering, University of Pennsylvania. Pocket Size. Leather, 155.
Seite 38 - was designed by Professor KANJUNE at an OOCTION to the above Series of Manuals. PROF. RANKINB'S WORKS— (Continued). VII. MISCELLANEOUS SCIENTIFIC PAPERS. Royal 8vo. Cloth, 31s. 6d. Part I. Papers relating to Temperature, Elasticity, and Expansion of Vapours, Liquids, and Solids. Part II. Papers on Energy and its Transformations. Part III. Papers on Wave-Forms, Propulsion of Vessels, &c.
Seite 16 - GENERAL CONTENTS. — The Materials of the Earth — A Mountain Hollow —Down the Valley — Along the Shore — Across the Plains — Dead Volcanoes —A Granite Highland— The Annals of the Earth— The Surrey Hills— The Folds of the Mountains. "The FASCINATING ' OpEN-AlK STUDIES' Of PnOF. OOLE give the subject a GLOW OF ANIMATION . . . cannot fail to arouse keen interest in geology."— Geological Magazine.
Seite 8 - All but the simplest explanations have, therefore, been avoided, and ANSWERS to the Exercises are given. Any person may readily, by careful study, become master of their contents, and thus lay the foundation for a further mathematical course, if desired. It...
Seite 17 - Management. PART II. — SEWAGE DISPOSAL WORKS IN OPERATION— THEIR CONSTRUCTION, MAINTENANCE, AND COST. Illustrated by Plates showing the General Plan and Arrangement adopted in each District.