Banded iron formation WikipediaOverview
Exploration and Mining Geology GeoScienceWorld
Paleoproterozoic Age Relationships in the Three Bluffs Archean Iron FormationHosted Gold Deposit Committee Bay Greenstone Belt Nunavut Canada Gold Potential of a Hidden Archean Fault Zone The Case of the CadillacLarder Lake Fault
A Geologic Formation Of Iron And Mining
Wisconsin Geological Natural History Survey » Mining Iron. Banded iron formation with alternating layers of silvery gray hematite and reddish finegrained silica (chert). Brief overview of Wisconsin's iron mining history. Read more
Geochemical mineralogical and structural characterization
planes at a steep pitch. Most of the remaining iron formation in the Gogebic Range is taconite with only1530% iron and would likely be economic only through open pit mining. The Tyler Formation is nearly 3000 m thick in the Gogebic Range and originated as finegrained siltstones and mudstones in a deep water setting.
Wisconsin Geological Natural History Survey » Mining Iron
Iron ore is present in a number of places and geologic settings within Wisconsin. Iron ore can be defined on the basis of its iron content into lowgrade ore (taconite) which commonly contains 25 to 35% iron and highgrade ore which contains 50 to 70% iron. Ironbearing ore minerals include oxides carbonates silicates and in some cases sulfides.
Geology Prospecting and Exploration for Iron Ore Deposits
Geology Prospecting and Exploration for Iron Ore Deposits. Iron has been known since antiquity. Iron is ubiquitous in the lithosphere as either a major constituent or in trace amounts. In abundance it ranks fourth behind oxygen silicon and aluminum. Iron ores have a wide range of formation in geologic time as well as a wide geographic distribution.
Ironwood The Rocks of the Penokee RangeA Fascinating Geologic History
THE LAKE SUPERIOR IRON RANGES GEOLOGY AND MINING
An iron range is an elongate belt of layered sedimentary rocks in which one or more layers consist of banded ironformation a rock composed of alternating ironrich and ironpoor layers on a scale of a few centimeters. Banded ironformation from the Gogebic Range. MINING HISTORY. First ore discoveries and mines Marquette Range Michigan Ore discovered 1844 first ore shipment 1852
Iron Geology for Investors
The red colour of many iron rich soils and iron formations is due to the presence of the iron oxide mineral hematite. On freshly exposed surfaces iron has a silvergrey metallic lustre. However before long on exposure to damp air the surface of iron oxidises to hydrated iron oxides
Bandediron formation rock Britannica
Bandediron formation (BIF) chemically precipitated sediment typically thin bedded or laminated consisting of 15 percent or more iron of sedimentary origin and layers of chert chalcedony jasper or quartz. Such formations occur on all the continents and usually are older than 1.7 billion years. They also are highly metamorphosed.