Sillamäe, Estonia HD

The locality of Sillamäggi was first mentioned in 1502 when the area was under the control of Livonian Order. The bridge across Sõtke and a mill in Sillamäggi were documented in 1700. In the 1800s, Sillamäggi developed into a resort village offering a more tranquil experience than the nearby resort town of Hungerburg. Russian physiologist Ivan Pavlov owned a dacha in Sillamäggi and vacationed there during summer breaks in 1891--1917. Among other famous vacationers of Sillamäggi were poet Konstantin Balmont (1905), painter Albert Benois (1898 and 1899), physicist Paul Ehrenfest (1908--1912), botanist Andrei Famintsyn (1890s), historian Mikhail Gershenzon (1911--1914), inventor Boris Rosing (1902--1911), composer Pyotr Ilyich Tchaikovsky (1868). In the 1920s and 1930s, Sillamäe and surrounding countryside saw the rise of the oil shale mining industry in the area. In 1927--1929, a Swedish company Estländska Oljeskifferkonsortiet built an oil shale processing plant and a power station at the location of the Türsamäe manor, on the western side of Sillamäe. This plant reached a total capacity of 500 tonnes per day in the mid-1930s. A small harbour was constructed in Sillamäe to support the plant activities, but it was destroyed during World War II. During the Nazi occupation, several concentration camps were established in the vicinity of Sillamäe to employ slave-laborers in the local mines. Upon withdrawal from Sillamäe in 1944, German forces sabotaged the processing plant. The defensive positions of Germans on the hills to the east of Sillamäe, known as Sinimäed, formed the Tannenberg Line during the Battle of Narva. In 1946--1948, the former oil shale processing plant in Sillamäe was rebuilt by Soviets to extract uranium oxide from the locally mined Dictyonema argillite ore (a type of oil shale). During that time, many war prisoners were employed at the construction and mining activities in Sillamäe. The uranium extraction process at the Sillamäe plant was developed in collaboration with a nearby Narva pilot plant (known as Cloth Dyeing Factory) and produced mainly a 40% uranium concentrate at the onset of plant production. The local mining operations continued until 1952. In the following years, richer uranium ores were imported to the Sillamäe plant from various locations of Central Asia and the Eastern Bloc, mainly from mines in Czechoslovakia, East Germany, Hungary, Poland and Romania including Bihor mine operated by Sovromcuarţ (one of the SovRoms operated jointly by the Soviet Union and Romania). In 1970, the plant started to process loparite ore from Kola Peninsula producing tantalum and niobium chemicals. Later, it also started to extract rare earth metal oxides. In 1982, the plant began the production of reactor-grade enriched uranium (2--4.4% 235U) in form of UO2. Uranium production at Sillamäe continued to supply nuclear materials for the Soviet nuclear power plants and weapon facilities until 1989. In the years of 1950--1989, the pla