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 SCOPE OF ECONOMIC GEOLOGY 13 the material above the bedrock has been worked out the Mine has reached its end as surely as striking a reef is fatal "0a ship at sea. Hence the Australian miners referred to the Yarren rock beneath the gold-bearing deposits as the reef, ind the term is still so used in alluvial mining. In some Mining fields it has come to mean the opposite ; for after the lluvig] deposit had been worked out the miners searched for the source of its gold in the quartz-veins in the bedrock ; they distinguished these veins of quartz from the pebbles of Hluvia] quartz as * quartz in the reef or *' reef-quartz, Which were in time abridged or reversed to quartz-reef. The long-established term for ore-veins is lode, which has been used in Cornwall, and by Chaucep and Shakespeare. The worg has the same origin as ** to lead ” and as *“ leet,” a *hanne] of water. A lode leads the miner along the course of the ore, When gold mining began in California in 1849 the term lode was adopted and is still used there, as in *“ the Great Mother Lode.” The equivalent term in German is 8ang" from the verb to go, and has the same meaning. ln South Africa, on the other hand, the term reef was adopted for the lodes, instead of for the country rock, and this practice has been extended in recent years. In some fields the term ‘ef has been used in the two opposite senses, for bedrock 0 regard to the alluvial deposits, where the “* reef drive ” is the main drive through the bedrock ; while lodes in the bedrock gre known as ‘‘reefs.” It would be well, where local Practice permits, to retain lode for sheets of ore, and reef "1 1tS original meaning for bedrock.

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