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

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Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part II. Ore deposits

Collection:: Economics Books

ORES OF COPPER R7 higher parts of the lode now destroyed or may be due to Primary deposition. ] The copper-field is about 80 miles long and includes, ac- tording to Finlayson (Econ. Geal., v, 1910, p. 407), thirty- three chief ore-bodies. The South Lode of Rio Tinto and its continuation, the San Dionisio Lode, are together more than I} miles long. La Zarza Lode and its continuation Perrunal are together also 1} miles long, and their full length is not yet known. La Rosa and the Sotiel are 11 50 and 900 yards long Tespectively, Most of the ore-bodies are between 250 and 000 yards long. The San Dionisio is 800 feet wide, and most of the larger lodes are between 150 and 500 feet wide. Their depth is small ‘in relation to their thickness, According to Finlayson the depth probably in no case exceeded about 3000 feet, and seldom 1500 feet. Some of the ore-bodies are thicker be- low, as the upper part of the lenticle is %ill preserved.” The ore-bodies eceur in different rocks, According to Finlay- son’s list four of them are in porphyry; two at the junction of slate and dia- base; eleven at that of slate and Porphyry, as at Rio Tinto and Calanas and sixteen are wholly enclosed in sedi- Qentary rocks, such as the Tharsis, Sotiel, and El Tinto (Fig, 20) which are In slate, Mr. Lyra similar mass of copper- oo bearing pyrite occurs at the Mt. Lyell Mine in Western Tasmania,” 50 miles inland, N. of Macquarie Harbour. Alluvia] gold was found in the district in 1881 and at Mt. Lyell in 1383 ; in 1891 was found the *“ Iron Blow,” a gossan Which contained gold and silver, and covered a large ore- body of Pyrite containing sufficient copper to pay for mining, the gold and silver being recovered as bye-products. The Mt. Lyell Mines? occur close to the contact of the YJ. W. Gre « os " : vis : gory, “The Mt, Lyell Mining Field with other Pyritic Ore Bodies,» Austral. 7M.E., 1905, viii. . 198.

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