Tajikistan WikipediaTajikistan means the "Land of the Tajiks". The suffix "-stan" is Persian for "place of" or "country" and Tajik is, most likely, the name of a pre-Islamic (before the ...Mini

Mining WikipediaMining is the extraction of valuable minerals or other geological materials from the earth usually from an orebody, lode, vein, seam, reef or placer deposits.Mining company prod

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Glossary of Mining Terms Kentucky Coal EducationA. Abutment In coal mining, (1) the weight of the rocks above a narrow roadway is transferred to the solid coal along the sides, which act as abu