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flotation process

(Encyclopedia)flotation process, in mineral treatment and mining, process for concentrating the metal-bearing mineral in an ore. Crude ore is ground to a fine powder and mixed with water, frothing reagents, and col...

Fairbanks

(Encyclopedia)Fairbanks, city (2020 pop. 32,515), Fairbanks North Star Borough, E central Alaska, on the Chena River near its confluence with the Tanana; inc. 1903. F...

Santa Fe Opera

(Encyclopedia)Santa Fe Opera, summer opera festival held outside Santa Fe, N. Mex., founded 1957. Featuring outstanding young singers and musicians, it presents a wide variety of operas from the standard repertory ...

Tikhonov, Viktor Vasilyevich

(Encyclopedia)Tikhonov, Viktor Vasilyevich, 1930–2014, Soviet and Russian ice hockey player and coach, b. Moscow. As a defenseman (1949–63), he won four national championships (1951–54) with the Soviet air fo...

Riobamba

(Encyclopedia)Riobamba rēōbämˈbä [key], city (1990 est. pop. 95,505), capital of Chimborazo prov., central Ecuador, near Chimborazo volcano, in a high basin of the Andes. Riobamba is the headquarters of the ra...

Oxnard

(Encyclopedia)Oxnard ŏkˈsnärd [key], city (1990 pop. 142,216), Ventura co., S Calif., on the Pacific coast; inc. 1903. Its economy, formerly based on agriculture, mining, and nearby military bases, has expanded ...

Open University

(Encyclopedia)Open University, headquartered at Milton Keynes, England; founded 1969 as the Univ. of the Air. In 1971 a distance learning program was begun that now consists of correspondence courses integrated wit...

Valkyries

(Encyclopedia)Valkyries vălkērˈēz [key], in Germanic mythology, warrior maidens of Odin. They presided over battles, chose those who were to die, and brought the souls of the dead heroes back to Valhalla. Chief...

Yamamoto, Isoroku

(Encyclopedia)Yamamoto, Isoroku yämäˈmōtō [key], 1884–1943, Japanese admiral in World War II. He headed the combined fleet in 1941 and was the mastermind behind Japan's attack on Pearl Harbor. After he was ...

Afinogenov, Aleksandr Nikolayevich

(Encyclopedia)Afinogenov, Aleksandr Nikolayevich əlyĭksänˈdər nyĭkəlīˈəvĭch əfēˌnəgyĕˈnəf [key], 1904–41, Russian playwright. In his early plays he wrote of labor problems and the dangers of str...