The Elements of economic geology

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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

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Document type:: Monograph

Structure type:: Chapter

Title:: Part I. Introduction

Collection:: Economics Books

THE FORMATION OF DEPOSITS 21 which occurs above tin in the Cornish mines (Fig. 9), still requires a moderate temperature for its formation, as is shown by its frequent formation in a contact ore. Lead, silver, and snc are found in still higher levels, and are often deposited 'n grits and limestone which show less alteration by heat \ J Slate: or soft) 200fe} B00f, Fi6. 9.—A Corepzr TiN Lope. The Passage of copper lodes (Cu) in slate into deeper tin lodes (Sn) in granite. East Pool and Wheel Agar Mine, Cornwall, (After Collins.) N, N, the north lode, Cu Sn W—north branch from the main lode contain. ing ores of copper, tin, and tungsten. and pressure than the rocks associated with most copper Ores. Mercury, the characteristic ore of the younger mountain systems, is often found in small quantities in hot springs and their sinters, and its chief ore-fields are in bands intensely shattered by the Middle Kainozoic

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