A brief history of mining in michigan s marquette and ,the michigan iron ores are found in very old pre-cambrian rocks of huronian sub- group the iron formations are associated with slates and quartzites that have been metamorphosed and folded.
the michigan iron ores are found in very old pre-cambrian rocks of huronian sub- group the iron formations are associated with slates and quartzites that have been metamorphosed and folded.Get Price
the most commonly listed primary commodities in michigan mines are iron copper and silver At the time these mines were surveyed, 215 mines in michigan were observed to have ore mineralization in an outcrop, shallow pit, or isolated drill holeknown as an occurance mine. michigan has 783 prospect mines. 818 mines were in production at the time the data was entered into usgs records.Get Price
negaunee iron formation and equivalents hosted the majority of the natural ore deposits and all of the concentrating grade production in michigan. In the marquette trough, the negaunee reaches a thickness of 1300 meters without including the mafic igneous horizons.Get Price
world consumption of iron ore grows 10% per annum on average with the main consumers being china, japan, korea, the united states and the european union. iron ore mining methods vary by the type of ore being mined. there are four main types of iron ore deposits worked currently, depending on the mineralogy and geology of the ore deposits.Get Price
types of iron ore. 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 low-grade ore which commonly contains to 35% iron, and high-grade ore, which contains to 70% iron.Get Price
the gogebic iron range extends for miles from lake namekagon, wisconsin, in the west, to lake gogebic in michigan, in the west. nathaniel moore uncovered ore deposits in the penokee gap near bessemer in 1872, but it was not until 1884 that the first iron ore shipment was made.Get Price
the impact of the civil war on iron ore mining in michigan by victor lemmer statement of the operations of the land department of marquette, houghton, and ontonagon r.r. Co for the year 1880. by houghton marquetteGet Price