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Showing 1 to 20 of 32 for “"Heavy Mineral"”.
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Elutriation Technology in Heavy Mineral Separations
… separators have been used in several different mineral processing fields for many years. Recent improvements in designs have led to the development of the CrossFlow separator. This new design employs a tangential feed system that has shown promise in several applications. This paper investigates …
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Mineralogy and provenance of the TiO₂ - ilmenite heavy mineral sand deposit of Nataka
The Nataka heavy mineral sand deposit occurs along the northeast Mozambique coastline. It comprises a regional Pleistocene elliptical structure extending from Somalia, passing through Kenya, Tanzania, Madagascar and Mozambique, to Richards Bay in South Africa. The deposit consists of fine- to …
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Experimental studies of heavy-mineral transportation, segregation, and deposition in gravel-bed streams
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1986.
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Mineralogic and Geochemical Variations within the Old Hickory Heavy Mineral Sand, Sussex and Dinwiddie Counties, Virginia
… and is presently operated by Iluka Resources. Heavy minerals constitute an average of 8% of the sediment, but locally reach concentrations as rich as 60%. The ore minerals, in order of decreasing concentrations, are ilmenite, rutile, and zircon, which are believed to have been derived from …
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Heavy minerals of the Cretaceous Hell Creek and Paleocene Ludlow Formations of Slope and Bowman counties, North Dakota
… are nonmarine sediments of alluvial origin. The heavy minerals of these formations were specifically studied to determine the source rock types and their provenance, and generally assess the diagenetic processes which affected the heavy minerals. </p><p> The heavy minerals include zircon, rutile, …
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Heavy minerals of glacial sediments in the area of Red Lake Falls, Minnesota
… adjacent areas were studied to determine their heavy-mineral assemolages. Seventy-two samples of fine sand were studied by optical grain-count methods and 77 samples of fine sand were studied by x-ray diffraction methods. Most formations contain a hornblende-garnet-pyroxene-epidote assemblage; …
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Reaction phenomena of iron oxide leaching in an evaporative acid bake reactor
Namakwa Sands is a heavy mineral mining and beneficiation business within Tronox, and produces two major products, zircon (zr02.Si02 99.9%) and rutile (Ti02 99.9%) at a combined annual rate of 140kt. The heavy mineral concentrates are exported to international markets to make specialist coatings …
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Mineral Chemistry of Heavy Minerals in the Old Hickory Deposit, Sussex and Dinwiddie Counties, Virginia
… is the largest of a series of Pliocene (?) age heavy mineral sand deposits in Virginia and North Carolina. The high density of heavy minerals allows for selective concentration during transport and deposition. Under the right conditions, placers of considerable size can be formed. The …
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Correlation of Glacial sediments Using Heavy-Minerals Assemblages
<p>An optical study of the heavy minerals of the till in two lithostratigraphic units in Polk, Red Lake, and Norman Counties in northwestern Minnesota was undertaken. The purpose was to determine whether the assemblages are different enough to differentiate the two tills and whet her the …
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Erosional history of the New River, southern Appalachians, Virginia
… with other field observations and with heavy-mineral analyses, are interpreted in terms of provenance, depositional environment (or accumulation), and preservation of the surficial deposits. In addition, these data are applied to an interpretation of the evolution of the New River …
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The Stratigraphy of Late Quaternary Deposits in the Payan Mining District, Narino, Colombia, South America
… of weathering, geomorphic relationships, and heavy mineral assemblages. Carbon-14 dates from wood suggest that the Antigua fan deposits are older (greater than 40,000 YBP) than the lower Panambi alluvium (less tahn 25,000 YBP) which is restricted to lower terraces within the modern river …
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Glacial geology of western Wells County, North Dakota
… and the other from the northwest. However, heavy mineral analyses of till indicate that the center of accumulation did not shift during this time. The two trends of ice advance are explained by lobation of the main ice sheet as it entered North Dakota. Lobation was caused by the Turtle …
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The Influence of Soil Reconstruction Methods on Mineral Sands Mine Soil Properties
Significant deposits of heavy mineral sands (primarily ilmenite and zircon) are located in Virginia in Dinwiddie, Sussex and Greensville counties. Most deposits are located under prime farmland, and thus require intensive reclamation when mined. The objective of this study was to determine the …
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Restoration of Prime Farmland Disturbed by Mineral Sand Mining in the Upper Coastal Plain of Virginia
Economic deposits of heavy mineral sand were identified in the late 1980's under prime farmland along the Upper Coastal Plain of Virginia. Mining in Virginia will commence in 1997 on the Old Hickory Deposit in Dinwiddie/Sussex Counties. Experiments were established on two mine pits representing two …
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Lode gold deposit characterization using evidence from stream sediments: an example from Brush Creek, Montgomery County, Virginia
Placer ore minerals are commonly intergrown with "relict" phases that coexisted with the ore mineral in the original lode deposit. Studying these relict phases can yield important information about the nature, and formation of the lode deposit. This type of study can be useful in areas with poor …
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Soil mineralogy of an upper coastal plain landscape in Virginia
A heavy mineral mining company (RGC Inc.) faces challenging mining and reclamation practices for its proposed operation in the Upper Coastal Plain of Virginia due to the high clay content of the deposit. The original intent of this study was to identify the mineralogy present in the proposed mining …
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A study of mantle inclusions in the Koffiefontein Kimberlite Pipe, South Africa
Mantle derived rock and mineral fragments from the Koffiefontein Kimberlite Pipe have been studied in the form of xenoliths, megacrysts, concentrate minerals and inclusions in diamonds. Mantle derived xenoliths are unusually scarce. The predominant xenoliths are pyroxenites. Peridotites are rare …
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A study of mantle inclusions in the Koffiefontein Kimberlite pipe, South Africa
Mantle derived rock and mineral fragments from the Koffiefontein Kimberlite Pipe have been studied in the form of xenoliths, megacrysts, concentrate minerals and inclusions in diamonds. Mantle derived xenoliths are unusuaLly scarce. The predominant xenoliths are pyroxenites. Peridotites are rare …
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Provenance of Eastern Magallanes Foreland Basin Sediments: Mineralogical and Geochemical Analyses Reveal Paleogene Tectonic Unroofing of the Fuegian andes
… by forming the Drake Passage in the Scotia Sea. Heavy mineral composition data from the eastern Magallanes basin of southernmost South America indicate that Campanian to middle Eocene sediments had a mafic/ophiolitic provenance which is interpreted as being derived from the Patagonian-Fuegian …
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Paleontology and Stratigraphy of the Caloosahatchee Marl of Florida
… for differentiating sediments. Sieve analysis, heavy mineral analysis, staining analysis, magnetic mineral separation and pebble count analysis were conducted. Two samples from Cleveland Quadrangle in Stutsman County, North Dakota were also analyzed to make an attempt at correlating equal …
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