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A bulla (or clay envelope) and its contents on display at the Louvre. Uruk period (4000–3100 BC).. A bulla (Medieval Latin for "a round seal", from Classical Latin bulla, "bubble, blob"; plural bullae) is an inscribed clay, soft metal (lead or tin), bitumen, or wax token used in commercial and legal documentation as a form of authentication and for tamper-proofing whatever is attached to it ...
This is a list of iron mines. This list is incomplete; you can help by adding missing items. (August 2022) North America. ... Iron-ore exports by country
Iron ore is the raw material used to make pig iron, which is one of the main raw materials to make steel — 98% of the mined iron ore is used to make steel. [2] In 2011 the Financial Times quoted Christopher LaFemina, mining analyst at Barclays Capital, saying that iron ore is "more integral to the global economy than any other commodity ...
Before the age of manhood, Roman boys wore a bulla, a neckchain and round pouch containing protective amulets (usually phallic symbols), and the bulla of an upper-class boy would be made of gold. [1] Other materials included leather and cloth. A freeborn Roman boy wore a bulla until he came of age as a Roman citizen. Before he put on his toga ...
This lists of mines in India is subsidiary to the list of mines article, and future mines in the country and is organised by the primary mineral output. For practical purposes stone, marbles and other quarries may be included in this list. In India, the underground mine to surface mine ratio is 20:80 [citation needed].
This list is incomplete; you can help by adding missing items. ( March 2012 ) This list of iron ore mines in Australia is subsidiary to the list of mines article and lists working, defunct and planned mines in the country organised by state.
List of iron ore mines in Australia; List of molybdenum mines; List of nickel mines. ... List of mines in India; List of mines in Indonesia; List of mines in Japan.
During the century 1770–1870, production was between 15,000 and 20,000 tonnes. In the 1870s, it rose to 40,000 tonnes and exports of pig iron from the Österby ironworks became significant. In order to facilitate shipments of ore Dannemora Hargs Railway (Dannemora–Hargs Järnväg) was built between Dannemora mines and Hargshamn in 1878 ...