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HEMATITE IRON-FORMATION [4 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2006-08-03

English

Subject field(s)
  • Petrography
CONT

Mineral and grain development should provide granular textures with well defined sharp grain boundaries to facilitate liberation and separation of metallic minerals... These features are usually achieved in highly metamorphosed iron-formation where there is optimum grain enlargement, and magnetite facies are usually preferred over hematite or mixed facies crude ore.

French

Domaine(s)
  • Pétrographie

Spanish

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Record 2 2006-02-02

English

Subject field(s)
  • Iron and Manganese Mining
CONT

Red ore is composed of earthy red hematite, goethite, soft aluminous silicates, and very fine grained chert or quartz. It is derived from the upper iron-rich part of the Ruth slate at the base of the iron-formation and from black slaty facies within it.

French

Domaine(s)
  • Mines de fer et de manganèse
CONT

Le minerai rouge est composé d'hématite rouge terreuse, de goethite, de silicates alumineux tendres et de chert ou quartz à grain très fin. Il est dérivé de la partie supérieure riche en fer de l'ardoise de Ruth à la base de la formation de fer et du faciès ardoisier noir intercalé.

Spanish

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Record 3 2006-02-01

English

Subject field(s)
  • Iron and Manganese Mining
CONT

Blue ore was derived from cherty oxide lithofacies of iron-formation and is composed of fine grained, blue to dark grey-black hematite with lesser amounts of red hematite, martite, and brown goethite. It has a distinctly porous granular texture and contains primary ovoid granules or oolites of iron oxide replaced by later hematite or goethite, or enlarged by overgrowths of iron oxide. Blue ore may be friable to crumbly or nodular, or hard coherent and lumpy where a high proportion of secondary iron oxide cements relict fragments.

Key term(s)
  • blue iron ore

French

Domaine(s)
  • Mines de fer et de manganèse
CONT

Le minerai de fer bleu est dérivé de lithofaciès oxydés et cherteux de la formation de fer; il est composé d'hématite à grain fin, de couleur bleue à gris foncé-noir, avec des quantités moindres d'hématite rouge, de martite et de goethite brune. Sa texture est distinctement grenue et poreuse et contient des granules ovoïdes primaires ou oolites d'oxydes de fer remplacés ultérieurement par de l'hématite ou de la goethite, ou agrandis par des accroissements secondaires d'oxydes de fer. Le minerai de fer bleu peut être soit friable à granulaire ou noduleux ou bien encore cohérent, dur et grumeleux lorsqu'une forte proportion d'oxydes de fer d'origine secondaire cimente les fragments reliques.

Spanish

Save record 3

Record 4 2005-08-24

English

Subject field(s)
  • Iron and Manganese Mining

French

Domaine(s)
  • Mines de fer et de manganèse

Spanish

Save record 4

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