the mineral group tantalite fe, mn ta 2 o 6 is the primary source of the chemical element tantalum.it is chemically similar to columbite, and the two are often grouped together as a semi-singular mineral called coltan or 'columbite-tantalite' in many mineral guides. however, tantalite has a much greater specific gravity than columbite 8.0 compared to columbite's 5.2 .
baryte used for drilling petroleum wells can be black, blue, brown or gray depending on the ore body. the baryte is finely ground so that at least 97% of the material, by weight, can pass through a 200-mesh 75 μm screen, and no more than 30%, by weight, can be less than 6 μm diameter.
galena is the main ore of lead, used since ancient times. because of its somewhat low melting point, it was easy to liberate by smelting. it typically forms in low-temperature sedimentary deposits. in some deposits the galena contains about 1–2% silver, a byproduct that far outweighs the
chromite concentrate, when combined with a reductant such as coal or coke and a high temperature furnace can produce ferrochrome. ferrochrome is a type of ferroalloy that is an alloy in between chromium and iron. this ferroalloy, as well as chromite concentrate can introduce various health effects. chromite ore is found in underground conditions. therefore, when exposed to aboveground conditions, various effects will occur.
the compagnie minière de l'ogooué, or comilog, is a manganese mining and processing company based in moanda, gabon. it is a subsidiary of the french metallurgical group eramet. the company is the world's second largest producer of manganese ore. at first the ore was carried by a cableway to the border with the republic of the congo, then by rail to the sea at pointe-noire. in the 1980s a railway was built to carry the ore through gabon to the sea near libreville.
kambalda type komatiitic nickel ore deposits are a class of magmatic iron-nickel-copper-platinum-group element ore deposit in which the physical processes of komatiite volcanology serve to deposit, concentrate and enrich a fe-ni-cu- sulfide melt within the lava flow environment of an erupting komatiite volcano.
ore bodies are formed by a variety of geological processes generally referred to as ore genesis ore deposits. an ore deposit is an accumulation of ore. this is distinct from a mineral resource as defined by the mineral resource classification criteria. an ore deposit is one occurrence of a particular ore type. most ore deposits are named according to their location for example, the .
ore is natural rock or sediment that contains desirable minerals, typically metals, that can be extracted from it. ore is extracted from the earth through mining and refined, often via smelting, to extract the valuable element or elements. the grade of ore refers to the concentration of the desired material it contains. the value of the metal an ore contains must be weighed against the cost of extraction to determine whether it is of sufficiently high grade to be worth mining.