16 فوریه 2006 . مهندس محمد افضل عمری، رييس عمومی معادن ذغال سنگ در شمال افغانستان می گويد سالانه صدها نفر در جريان کار در اين معادن در اثر انفجارها جان می دهند. برآوردها نشان می دهد که در مناطق شمالی افغانستان دست کم يازده معدن وجود دارد که به دليل بهره برداری غيرفنی از آن، خطر تلفات جانی در آنها، همچنان موجود است. معدن ذغال سنگ.
Laterite is a soil and rock type rich in iron and aluminium, and is commonly considered to have formed in hot and wet tropical areas. Nearly all laterites are of rusty-red coloration, because of high iron oxide content. They develop by intensive and long-lasting weathering of the underlying parent rock. Tropical weathering.
Laterite, soil layer that is rich in iron oxide and derived from a wide variety of rocks weathering under strongly oxidizing and leaching conditions. It forms in tropical and subtropical regions where the climate is humid. Lateritic soils may contain clay minerals; but they tend to be silica-poor, for silica is leached out by waters.
Laterite is a reddish weathering product of basalt. At least this is what it is in India where this rock or a soil type was first defined by a Scottish scientist Francis Buchanan-Hamilton in 1807. However, not all laterites are enriched in iron and sometimes they are not even reddish. Some lateritic rocks (bauxite) are mined.
Laterite (from the Latin word later, meaning "brick" or "tile") is a surface formation that is enriched in iron and aluminum. Found mainly in hot, wet tropical areas, it develops by intensive and long-lasting weathering of the underlying parent rock. Laterite formations in non-tropical areas are products of former geological epochs.
Informations on laterites, bauxites and lateritic ores.
Dec 8, 2016 . LATERITE MANU MALIEKAL PRASHINPRASHANTH MALAVIKA M ATHIRAD AMRITAS Abdulla farhan.
Dec 28, 2016 . What is LATERITE? What does LATERITE mean? LATERITE meaning - LATERITE pronunciation - LATERITE definition - LATERITE explanation - How to pronounce LATERITE.
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Laterite soil is reddish to yellow in color with a lower content of nitrogen, phosphorus, potassium, lime, and magnesia with 90–100 of iron, aluminum, titanium, and manganese oxides. The word laterite has been derived from the Latin word that means brick. The laterite soil is formed under conditions of high temperature.
Synopsis. Origin, occurrence, and correct identification of latente rock and soil are briefly discussed. The peculiar properties of latente soils are outlined and suggested methods of dealing with them are indicated. Results are reported of experimental studies on four latente soils and one intrazonal non-laterite soil, with.