lower ore grade

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• Iron 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 …   Wikipedia

• Kambalda type komatiitic nickel ore deposits — Kambalda type nickel ore deposits are a class of magmatic nickel copper ore deposit in which the physical processes of komatiite volcanology serve to enrich, concentrate and deposit nickel bearing sulfide within the lava flow environment of an… …   Wikipedia

• high-grade — adjective Of high quality, particularly good. The high grade ore was much more more profitable than lower grade ore. Ant: low grade …   Wiktionary

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• Channel-iron deposits — (CID) are iron rich fluvial sedimentary deposits of possible Miocene age occupying meandering palaeochannels in the Early to Mid Tertiary Hamerlsey palaeosurface of Western Australia. Examples are also known from Kazakhstan. The deposits are… …   Wikipedia

• Uranium — (pronEng|jʊˈreɪniəm) is a silvery gray metallic chemical element in the actinide series of the periodic table that has the symbol U and atomic number 92. It has 92 protons and 92 electrons, 6 of them valence electrons. It can have between 141 and …   Wikipedia

• Hubbert peak theory — Hubbert peak redirects here. For the episode of The West Wing, see The Hubbert Peak. M. King Hubbert s original 1956 prediction of world petroleum production rates …   Wikipedia

• Quincy Mine — Infobox nrhp | name =Quincy Mining Company Historic District nrhp type = nhld caption = The #2 Shafthouse (left) and the Hoist House (right) nearest city= Hancock, Michigan locmapin = Michigan area = architect= Quincy Mining Co. architecture= No… …   Wikipedia

• Shrinkage stope mining — Shrinkage stope is a generic term used in mining to describe the process of mining upwards from a lower to a high horizon, leaving broken rock in the excavation created. The broken rock acts as a working platform, and helps to stabilise the… …   Wikipedia

• Fuel extraction in Pakistan — Contents 1 Oil industry 1.1 Discovery 1.2 History 1.3 Modern exploration 1.3.1 Pakistan Oilfields Limit …   Wikipedia