Century Dictionary and Cyclopedia
- n. A quartzose iron-slate or iron-mica slate; a rock made up chiefly of alternating layers of quartz and specular iron ore. The term is used by writers on the geology of Brazil.
“In the center of a mass of quartzites that seem lo constitute the upper level of the eruptive grounds of the province, there are found strata of an ore of iron designated as _itabirite_ -- a mixture of oxide of iron and quartz.”
“It is simply titaniferous iron, iserine, pleonaste, ilmenite [Footnote: Or peroxide of iron, with 8 to 23 per cent, of blue oxide of titanium.] and degraded itabirite, the iron and quartz formation so called in the Brazil; and it is the same mineral which”
“At a greater depth the itabirite will be found solid; and the occurrence of these oldest crystalline formations in large layers is a hopeful sign.”
“Discovery of 50Mt of direct shipping ore (DSO) is the primary target, however itabirite ore (lower grade but potential very high tonnage) will also be targeted.”
“Previous rockchip sampling of this outcropping massive magnetite/hematite and associated itabirite units returned iron values ranging from 55-67% Fe.”
“Iron values of the weathered itabirite group have a range of 30-47% Fe”
“The results have identified the occurrence of itabirite (magnetite-bearing metasediments) on a larger scale than previously known information indicated, confirming the iron ore prospectivity of the Ngovayang Project.”
“The results identified the occurrence of itabirite on a larger scale than previously known information indicated at Ngovayang, confirming the iron ore prospectivity of the project.”
“However, the magnetic units are much more extensive than the mapped units, indicating that the itabirite units are more widespread than previously thought, but do not always outcrop.”
“These magnetic units can often be correlated with itabirite mapped by le Bureau de Recherche Geologiques et Minieres (BRGM) in 1986.”
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