Hausmannite is a complex oxide of manganese containing both di- and tri-valent manganese. The formula can be represented as Mn2+Mn3+2O4. It belongs to the spinel group and forms tetragonal crystals. Hausmannite is a brown to black metallic mineral with Mohs hardness of 5.5 and a specific gravity of 4.8.
The Artillery Mountains are a mountain range in Mohave County in western Arizona. High point of the range is Artillery Peak, 2,917 feet above sea level. Artillery Peak is at coordinates N 34.36946 W 113.58160.
Koira is a village in Sundargarh District, Odisha, India.
The Iacobeni mine is a large mine in the north of Romania in Suceava County, 96 km southwest of Suceava and 340 km north of the capital, Bucharest. Iacobeni represents the third largest copper reserve in Romania having estimated reserves of 200 million tonnes of ore grading 0.4% copper. The mine also has one of the largest manganese reserves in Romania estimated at 2.5 million tonnes of ore with an annual production of around 70,000 tonnes.
Metal production, in particular iron and steel industry, is the dominant heavy industry in Ukraine. Ukraine is the world's eighth largest producer and third largest exporter of iron and steel (2007). Ukrainian iron and steel industry accounts for around 2% of worldwide crude steel output, 5% to 6% of the national gross domestic product and 34% of Ukrainian export revenue. In 2007 it employed 420,000 people – 10% of industrial labor and 2% of the total workforce. It has the highest, by a wide margin, revealed comparative advantage of all branches of the Ukrainian economy. The industry peaked at 42.8 million tonnes in 2007 but has been gravely affected by the financial crisis of 2007–2010 and declined to 29.8 million tonnes in 2009.
The Ulukent mine is a large mine in the west of Turkey in Denizli Province 405 km (252 mi) west of the capital, Ankara. Ulukent represents the largest manganese reserve in Turkey having estimated reserves of 2.5 million tonnes of manganese.
The Răzoare mine is a large mine in the north of Romania in Maramureş County, 43 km southeast of Baia Mare and 507 km north of the capital, Bucharest. Răzoare represents one of the largest manganese reserve in Romania having estimated reserves of 5 million tonnes of manganese.
The Delinești mine is a large mine in the west of Romania in Caraș-Severin County, 38 km east of Reșița and 448 km west of the capital, Bucharest. Delinești represents one of the largest manganese reserve in Romania having estimated reserves of 7.5 million tonnes of manganese ore grading 20% manganese metal.
The Globurău mine is a large mine in the west of Romania in Caraş-Severin County, 29 km north of Orşova and 392 km west of the capital, Bucharest. Globurău represents one of the largest manganese reserve in Romania having estimated reserves of 3 million tonnes of manganese.
The Rudăria-Bănia mine is a large open pit mine in the south-western Romania in Caraș-Severin County. Rudăria-Bănia represents one of the largest iron ore reserves in Romania having estimated reserves of 70 million tonnes of ore grading 45% iron metal and 20% manganese metal. The mine has the capability to produce around 500,000 tonnes of iron ore/year.
The Piavitsa mine is a mine located in the north of Greece in Central Macedonia. Piavitsa represents one of the largest manganese reserve in Greece having estimated reserves of 10.5 million tonnes of manganese ore grading 34% manganese metal.
The Wafangzi mine is a mine located in the north of China in Inner Mongolia. Wafangzi represents one of the largest manganese reserve in China having estimated reserves of 37.7 million tonnes of manganese ore grading 24% manganese metal.
The N'chwaning mine are located in the Northern Cape Province of South Africa. N'chwaning has one of the largest manganese reserves in South Africa having estimated reserves of 323.2 million tonnes of manganese ore grading 42.5% manganese. There are three shafts, designated as N'Chwaning, N'Chwaning II and N'Chwaning III. The majority of the major mineral finds documented originate from the N'Chwaning II shaft.
The Gloria mine is a mine located in the north of South Africa. Gloria represents one of the largest manganese reserve in South Africa having estimated reserves of 156.2 million tonnes of manganese ore grading 33% manganese metal.
The Black Rock mine is a mine located in the north of South Africa. Black Rock represents one of the largest manganese reserves in South Africa having estimated reserves of 70.4 million tonnes of manganese ore grading 39% manganese metal.
The Azul mine is a mine in the north of Brazil in Pará. Azul represents one of the largest manganese reserves in Brazil, having estimated reserves of 64.2 million tonnes of manganese ore grading 28% manganese metal.
The Mamatwan mine is a mine located in the west of South Africa in Northern Cape. Mamatwan represents one of the largest manganese reserves in South Africa having estimated reserves of 433 million tonnes of manganese ore grading 40% manganese metal.
The Wessels mine is a mine located in the west of South Africa in Northern Cape. Wessels represents one of the largest manganese reserve in South Africa having estimated reserves of 190.8 million tonnes of manganese ore grading 55% manganese metal.
The Batesville mine is a mine located in the midsouth of the United States in Arkansas. Batesville represents one of the largest manganese reserve in the United States having estimated reserves of 178 million tonnes of manganese ore grading 4% manganese metal.
The Șaru Dornei mine is a mine located in the north of Romania in Suceava County. Șaru Dornei represents one of the largest manganese reserve in the Romania having estimated reserves of 15 million tonnes of manganese ore grading 26% manganese metal.
