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 III. Earthy minerals

Collection:: Economics Books

THE SALT DEPOSITS 217 Diligent search has been made for other supplies of potash and many efforts to extract it from leucite rocks and potash- felspar, as well as from seaweed and sunflowers. Beds of potash salts have been found where large sheets of sea-water have been evaporated. The basin of Afar at the southern end of the Red Sea is geographically well suited for the formation of salt deposits; for it is below sea-level and could have been repeatedly flooded from the sea. Potash deposits there have been worked to some extent. The two most important non-German sources of potash are some beds left by the evaporation of an Oligocene lake near Mulhouse in Alsace. The deposits were developed under the control of the German Kali Syndicate, but after the War were for a time worked independently. A second field is in the north-east of Spain near Cardona and Suria; the potash minerals include carnallite, kainite, kieserite, sylvin- ite, and polyhalite, and rest on a thick block of salt and gypsum. Some potash has been extracted from the mud of lakes, such as Searles Lake in California, which receive the drainage from rocks rich in potash. At one time objection was taken in Germany to the ex- port of potash on the ground that it would all be wanted by the local farmers, Ochsenius was instructed to report on the available supplies; his report that one of the German fields could maintain an output of 3,000,000 tons per annum for over 600,000 years showed this fear was futile. The output is however limited to safeguard the water supply; as otherwise the waste waters would render the rivers too salt for drinking and would be fatal to the fish.

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