mined economically
61Carbon — (), but as most compounds with multiple single bonded oxygens on a single carbon it is unstable.] Cyanide (CN–), has a similar structure, but behaves much like a halide ion (pseudohalogen). For example it can form the nitride cyanogen molecule… …
62Graphite — For other uses, see Graphite (disambiguation). Graphite Graphite specimen General Category Native element mineral …
63Iron ore — Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, deep purple, to rusty red. The iron itself is usually found in the …
64Mountaintop removal mining — Mountaintop removal site Mountaintop removal in Martin County, Kentucky M …
65Cheadle Coalfield — Foxfield Colliery The Cheadle Coalfield is a coalfield in the United Kingdom. Centred around the town of Cheadle, Staffordshire and its outlying villages it lies to the east of Stoke on Trent and the much larger North Staffordshire Coalfield. The …
66Serbia — /serr bee euh/, n. a former kingdom in S Europe: now, with revised boundaries, a constituent republic of Yugoslavia, in the N part; includes the autonomous provinces of Kosovo and Vojvodina. 9,660,000; 34,116 sq. mi. (88,360 sq. km). Cap.:… …
67Zambia — Zambian, adj., n. /zam bee euh/, n. a republic in S Africa: formerly a British protectorate and part of the Federation of Rhodesia and Nyasaland; gained independence 1964; a member of the Commonwealth of Nations. 9,349,975; 288,130 sq. mi.… …
68Penwith — ( kw. Pennwydh) is a local government district in Cornwall, England, United Kingdom, whose council is based in Penzance. The district covers all of the Penwith peninsula, the toe like promontory of land at the western end of Cornwall and which… …
69Diamond simulant — Due to its low cost and close visual likeness to diamond, cubic zirconia has remained the most gemologically and economically important diamond simulant since 1976. The high price of gem grade diamonds, as well as significant ethical concerns of… …
70Ore grade — is a measure that describes the concentration of a valuable natural material (such as metals or minerals) in its surrounding ore. Ore grade is used to assess the economic feasibility of a mining operation: the cost of extracting a natural… …
