mined economically
81Oil shale industry — Stuart oil shale pilot plant (now dismantled) Oil shale industry is an industry of mining and processing of oil shale a fine grained sedimentary rock, containing significant amounts of kerogen (a solid mixture of organic chemical compounds), from …
82Peak copper — is the point in time at which the maximum global copper production rate is reached, after which, according to theory, the production rate will enter terminal decline. Copper is among the most important industrial metals. Like fossil fuels, copper …
83Desert — Not to be confused with dessert. This article is about dry terrain. For the act of abandoning or withdrawing support, see desertion. For other uses, see Desert (disambiguation) …
84Donets Basin — major industrial and coal producing region in the lower valley of the Donets River * * * or Donbas Large mining and industrial region, southeastern Ukraine and southwestern Russia. Notable for its coal and iron reserves, the exploited area of the …
85Europe — /yoor euhp, yerr / for 1; /yoo roh pee, yeuh / for 2, n. 1. a continent in the W part of the landmass lying between the Atlantic and Pacific oceans, separated from Asia by the Ural Mountains on the E and the Caucasus Mountains and the Black and… …
86Niger — Nigerien /nuy jear ee en /, adj., n. /nuy jeuhr/; Fr. /nee zherdd /, n. 1. a republic in NW Africa: formerly part of French West Africa. 9,388,359; 458,976 sq. mi. (1,188,748 sq. km). Cap.: Niamey. 2. a river in W Africa, rising in S Guinea,… …
87ore — /awr, ohr/, n. 1. a metal bearing mineral or rock, or a native metal, that can be mined at a profit. 2. a mineral or natural product serving as a source of some nonmetallic substance, as sulfur. [bef. 900; conflation of ME ore, OE ora ore,… …
88Thailand — /tuy land , leuhnd/, n. 1. Formerly, Siam. a kingdom in SE Asia: official name of Siam 1939 45 and since 1949. 59,450,818; 198,242 sq. mi. (513,445 sq. km). Cap.: Bangkok. 2. Gulf of. Also called Gulf of Siam. an arm of the South China Sea, S of… …
89Yukon — Yukoner, n. /yooh kon/, n. 1. a river flowing NW and then SW from NW Canada through Alaska to the Bering Sea. ab. 2000 mi. (3220 km) long. 2. a territory in NW Canada. 21,392; 207,076 sq. mi. (536,325 sq. km). Cap.: Whitehorse. 3. a town in… …
90tin processing — Introduction preparation of the ore for use in various products. Tin (Sn) is a relatively soft and ductile metal with a silvery white colour. It has a density of 7.29 grams per cubic centimetre, a low melting point of 231.88° C… …
