Käina seamud deposit
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Healthcare: Mud wraps, Quasi drugs, Fangotherapies, Therapeutic treatments, Ingredient extraction
Spa/Wellness: Beauty masks, Pelotherapies, Medical masks
Agriculture: FertilizersZeta potential: -0.7 – -9.5 mV
Humidity: 65 – 75 %
Density: 1,24 – 1,42 g/cm3
Viscosity: 55 000 – 100 000 mPa*s
Shear Strength: 1 000 – 3 500 dyn/cm3
Käina seamud deposit (Estonian: Käina meremudamaardla) is a national mineral resource deposit[1] in Estonia, Hiiu County, located in the western part of Käina Bay, Hiiumaa Island. In accordance to the Earth's Crust Act sea mud is a mineral resource in Estonia.[2] Käina seamud deposit is one of 3 national seamud deposits in Estonia. The active reserve of the Käina seamud deposit in December, 2018 was 273,8 thousand tons and passive reserve 1 546,0 thousand tons.[3]
Several studies on geology and natural conditions have been implemented in Käina deposit. Radioactive studies were carried out in the first half of the 20th century. In 1922, M. Kand and F. Dreyer studied the radioactivity of the curative mud, which at that time was considered to be the main factor causing the therapeutic effect. The radioactivity of the mud in Käina Bay has measured 6.9 Mache units. In his monograph, published in 1947, Voldemar Vadi also mentions the radioactivity of fresh mud 6.9 Mache units and stood mud at 2.1 Mache units.
In 1957–1959, the Institute of Experimental and Clinical Medicine of the Academy of Sciences of the ESSR studied sea mud in Hiiumaa Island. Käina Bay mud was found to be the largest curative mud reserve in Hiiumaa, at the Bay's southern site mud deposit averaged several square kilometers forming a 0,5 - 1,0 meters thick deposit. In the 1960s, E.Türi determined the thickness of mud and analyzed it lithologically. In 1963, the Central Institute of Spa and Physiotherapy carried out complex researches on curative mud. In 1985, the ESSR Geology Administration conducted a comprehensive study for the purposes of determining curative mud reserves and quality in Käina Bay. The latest thorough studies date back to 1997 when the reserves in several curative mud deposits in Estonia were studied.
In 1998, the Geological Survey of Estonia prepared an investigation report by Kalle Suuroja and Ene Kadastik, which gives a short review of the mineral resources (sand, gravel, clay, limestone, curative mud, mineral water) of Hiiumaa Island (County) and the recommendation for economical using of these 28 sand and gravel, 6 clay, 6 limestone, 1 seamud and 1 mineral water deposits in the island. Deposits have been characterized in detail and the conception of economical use of mineral resources of Hiiumaa Island concluded that the reserves of the above-mentioned mineral resources meet the needs of Hiiumaa county as a small island. At the present extraction level the lasting of these resources of Hiiumaa Island is guaranteed for more than a hundred years.[4]