e/Tin sources and trade in ancient times

Information
has gloss	eng: Tin is an essential metal in the creation of tin bronzes and its acquisition has been an important part of Bronze Age and later cultures throughout ancient history. Its use began in the Near East and the Balkans around 3000 BC. Tin is a relatively rare element in the Earth’s crust, with approximately 2 p.p.m. (parts per million), compared to iron with 50,000 p.p.m., copper with 70 p.p.m., lead with 16 p.p.m., arsenic with 5 p.p.m., silver with 0.1 p.p.m., and gold with 0.005 p.p.m. . Ancient sources of tin were therefore rare and the metal usually had to be traded over very long distances to meet demand in areas lacking tin deposits.
lexicalization	eng: Tin sources and trade in ancient times
instance of	(noun) a silvery malleable metallic element that resists corrosion; used in many alloys and to coat other metals to prevent corrosion; obtained chiefly from cassiterite where it occurs as tin oxide tin, atomic number 50, Sn

Media
media:img	Cassiterite - Mt Bischoff mine, Waratah, Tasmania, Australia.jpg
media:img	Gefuding Gui.jpg
media:img	Huntingdon wheelpit2.jpg
media:img	Map of Europe according to Strabo.jpg
media:img	Sword bronze age (2nd version).jpg
media:img	Tin-ancient-sources.svg