The Elements of economic geology

Bibliographic data

Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

Usage license:: Get license information via the feedback formular.

Document type:: Monograph

Structure type:: Contents

Collection:: Economics Books

CONTENTS PART I [INTRODUCTION CHAPTER I PAGE THE Score or EcoNoMic GeoLogy AND THE SEARCH FOR ORES 1 Definitions of Mineral, Ore-grade, and Metal, The Sporadic Dis. tribution of Ores, Prospecting, Structure of Lodes. The term Reef, CHAPTER II THE FORMATION OF DEPOSITS OF USEFUL MINERALS ® . History of Study of Ores. Structure of the Earth ; its Barysphere. Source of the Metals in Ores. Ore Formation in Relation to Igneous Rocks. The Ore Zone, Plutonic, Juvenile, and Magmatic Waters. Magmatic Ores. Lode Deposition—Hyda- togenesis, Propylitization, and Pneumatolysis. Lode Structure and Depth of Ore Formation. Ore Sequence in Depth. Ore Shoots and Ore-bodies. Efflorescent Minerals. Bedded Mineral Deposits. Alluvial Ores and Placers. Microscopic Study of Ores. Chief Mineral Deposits due to Segregation, PART II ORE DEPOSITS CHAPTER IIT ORES OF GoLD . . . Gold and its Qualities. Gold in Sea-water, Gold Lodes and Ig- neous Rocks. Classification of Gold Ores— Primary Ores. Gold-quartz Fissure Lodes, California, Ballarat, Mysore, Volcanic Fields—Rocky Mountains and New Zealand. Pneu- matolytic Ores—Cripple Greek and Passagem, Brazil. Iso. lated Gold-quartz Veins—Saddle- and Ladder-lodes. Im- pregnations and Replacements — Rhodesia, Homestake, Alaska, and Porcupine. The Goldfields of West Australia. Secondary Ores—Mount Morgan, Queensland, Alluvial Goldfields—Placers ; Deep Leads, The Rand Banket. Morro Velho. 2

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