# Black tin

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{{Short description|Tin ore}}
{{Use dmy dates|date=April 2022}}
{{No footnotes|date=September 2020}}
[[File:Cassiterite-253925.jpg|thumb|A lump of "black tin", so called because of its color; in this case it is [cassiterite](/source/cassiterite) from [Cornwall](/source/Cornwall)]]
'''Black tin''' is the raw [ore](/source/ore) of [tin](/source/tin), usually [cassiterite](/source/cassiterite), as sold by a [tin mine](/source/tin_mine) to a [smelting](/source/smelting) company.  After mining, the ore must be concentrated by several processes to reduce the amount of [gangue](/source/gangue) it contains before it can be sold. It contrasts with [white tin](/source/white_tin), which is the [refined](/source/Refining), metallic tin produced after smelting.

The term "black tin" was historically associated with [tin mining](/source/tin_mining) in [Devon](/source/Devon) and [Cornwall](/source/Cornwall).

==References==
{{Portal|Cornwall}}
*{{cite book | url = https://books.google.com/books?id=V2MMAAAAYAAJ&pg=PA448 | page = 448 | title = Chambers's encyclopædia: A dictionary of universal knowledge | year = 1868}}
*{{cite book | url = https://books.google.com/books?id=um-EXNlRKO4C&pg=PA1526 | page = 1526 | title = Mining, Metallurgy, and Minting in the Middle Ages: Continuing Afro-European Supremacy, 1250-1450 | isbn = 9783515087049 | last1 = Blanchard | first1 = Ian | year = 2005| publisher = Franz Steiner Verlag }}
*{{cite book | url = https://books.google.com/books?id=lhTOAAAAMAAJ&pg=PA40 | page = 40 | title = Carew's Survey of Cornwall: To which are added, notes illustrative of its history and antiquities | last1 = Carew | first1 = Richard | year = 1811}}
*{{cite book | url = https://books.google.com/books?id=ok5DAAAAYAAJ&pg=PA38 | page = 38 | title = The miner's manual of arithmetic and surveying ...: With a compendium of mensuration and a concise treatise on practical geometry and plane trigonometry; also a course of mine surveying ... Together with levelling and land surveying | last1 = Rickard | first1 = William | year = 1859}}

Black
Category:Mining in Cornwall

{{Mining-stub}}

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