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Actinium is a chemical element; it has symbol Ac and atomic number 89. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name emanium; the element got its name by being wrongly identified with a substance André-Louis Debierne found in 1899 and called actinium. The actinide series, a set of 15 elements between actinium ...
History. Opened. 1980. Closed. 1986. Serra Pelada (English: "Naked Mountain Range") is a Brazilian village, district of the municipality of Curionópolis, in the southeast of Pará. Serra Pelada was a large gold mine in Brazil, 430 kilometres (270 mi) south of the mouth of the Amazon River. The mine was made infamous by the still images taken ...
The city nickname is cidade pepita, which translates as "gold nugget city." The city is known for the intense gold mining activity in the valley of the Tapajós River, the multitude of landscapes (such as the sandy river beaches that are formed during the dry seasons, and also the waterfalls located in the district of São Luiz do Tapajós ...
Graphs of abundance vs atomic number. [] Abundance (atom fraction) of the chemical elements in Earth's upper continental crust as a function of atomic number; [ 5 ] siderophiles shown in yellow. Graphs of abundance against atomic number can reveal patterns relating abundance to stellar nucleosynthesis and geochemistry.
Actinium-225 is a member of the radioactive neptunium series; [60] it was first discovered in 1947 as a decay product of uranium-233 and it is an α-emitter with a half-life of 10 days. Actinium-225 is less available than actinium-228, but is more promising in radiotracer applications. [30]
The actinide series is a group of chemical elements with atomic numbers ranging from 89 to 102, [note 1] including notable elements such as uranium and plutonium.The nuclides (or isotopes) thorium-232, uranium-235, and uranium-238 occur primordially, while trace quantities of actinium, protactinium, neptunium, and plutonium exist as a result of radioactive decay and (in the case of neptunium ...
Mining in Paraná is a set of studies, research, knowledge, and theories regarding the mineralogical aspects of the state of Paraná, in Brazil. Paraná is the second federative unit of Brazil that produces the most talc, which is extracted in the municipality of Ponta Grossa. In 2016, it was responsible for 40% of the country's production ...
The Morro do Ouro (Paracatu) open-pit mine is operated by Rio Paracatu Mineração (RPM), a 100% owned subsidiary of the Canadian company Kinross Gold Corporation. The gold content of the ore is comparatively low, about 0.41 gram of gold for every ton of ore extracted. Annual production is about 15 tonnes of gold and 5 tonnes of silver. [4] [5]