- placer iron
- 砂铁
English-Chinese geology dictionary (英汉地质大词典). 2013.
placer iron
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placer mining — ☆ placer mining [plas′ər ] n. mining of placer deposits by washing, dredging, or other hydraulic methods * * * Oldest method of recovering gold from alluvial deposits. It takes advantage of gold s high density, which causes it to sink more… … Universalium
Placer mining — (pronounced plass er ) refers to the mining of alluvial deposits for minerals. This may be done by open pit (also called open cast mining) or by various forms of tunneling into ancient riverbeds. Excavation may be accomplished using water… … Wikipedia
Placer deposit — In geology, a placer deposit or placer is an accumulation of valuable minerals formed by deposition of dense mineral phases in a trap site. The name is from the Spanish word placer , meaning alluvial sand . Types of placer deposits include… … Wikipedia
placer claim — A mining claim located on the public domain for the purpose of placer mining, that is, ground within the defined boundaries which contains mineral in its earth, sand, or gravel; ground which includes valuable deposits not in place, that is, not… … Black's law dictionary
placer mines — Mines in which the mineral is generally found in the softer material which covers the earth s surface, and not among the rocks beneath. Reynolds v Iron Silver Mining Co. 116 US 687, 695, 29 L Ed 774, 777, 6 S Ct 601 … Ballentine's law dictionary
placer mining — Taking the soft earthy matter in which the particles of mineral are loosely mingled, and, by filtration, separating the one from the other. Reynolds v Iron Silver Mining Co. 116 US 687, 695, 29 L Ed 774, 777, 6 S Ct 601 … Ballentine's law dictionary
Joshua Hendy Iron Works — Infobox Company name = Joshua Hendy Iron Works type = Defunct (1947) genre = foundation = 1856 founder = Joshua Hendy location city = Sunnyvale, California location country = USA location = locations = area served = key people = industry =… … Wikipedia
The Iron Horse — Le Cheval de fer Le Cheval de fer Titre original The Iron Horse Réalisation John Ford Acteurs principaux George O Brien Madge Bellamy Production William Fox Durée 133 min. Sortie 28 août … Wikipédia en Français
hydraulic mining — placer mining using a pressurized stream of water. Also called hydraulicking /huy draw li king, drol i king/. [1855 60, Amer.] * * * use of a powerful jet of water to dislodge minerals present in unconsolidated material, including mine… … Universalium
Ore genesis — The various theories of ore genesis explain how the various types of mineral deposits form within the Earth s crust. Ore genesis theories are very dependent on the mineral or commodity. Ore genesis theories generally involve three components:… … Wikipedia
mining — /muy ning/, n. 1. the act, process, or industry of extracting ores, coal, etc., from mines. 2. the laying of explosive mines. [1250 1300; ME: undermining (walls in an attack); see MINE2, ING1] * * * I Excavation of materials from the Earth s… … Universalium
