Essays about: "mineral chemistry"

Showing result 21 - 25 of 40 essays containing the words mineral chemistry.

1. 21. Geochemical processes in mine waste subjected to a changing chemical environment: Fe speciation in leachate water from column experiments

   University essay from Luleå tekniska universitet/Geovetenskap och miljöteknik

   Author : Paula Lundberg; [2017]
   Keywords : Sulfidic mine waste; Sulfide oxidation; Water quality; Environmental analytical chemistry; Iron redox speciation;

   Abstract : Oxidation of sulfidic mine waste is of significant environmental concern due to the consequent formation of acid rock drainage (ARD), deteriorating the water quality of natural water systems. Iron (Fe) and sulfur (S) are two major redox elements involved in these reactions and typically the major redox-sensitive elements (whose solubility, speciation, and mobility are affected by pH and Eh) in water affected by ARD. READ MORE

3. 22. Geometallurgical approach to understand how the variability in mineralogy at Zinkgruvan orebodies affects the need for copper activation in the bulk rougher-scavenger flotation

   University essay from Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

   Author : Ivan Belo Fernandes; [2017]
   Keywords : Geometallurgy; Zinkgruvan; Zn-Pb flotation; ore variability; mineral chemistry; pyrrhotite; magnetic separation;

   Abstract : Zinkgruvan is a Pb-Zn-Ag deposit located in south-central Sweden, owned and operated by Lundin Mining. The ore is beneficiated by a collective-selective flotation circuit, recovering both galena and sphalerite in a bulk rougher-scavenger flotation stage and later on separating them into two final products. READ MORE

4. 23. Metamorphic Evolution of the Tjeliken Garnet-Phengite Gneiss, Northern Jämtland, Swedish Caledonides

   University essay from Uppsala universitet/Institutionen för geovetenskaper

   Author : Barbro Andersson; [2016]
   Keywords : Seve Nappe Complex; Scandinavian Caledonides; high-pressure metamorphism; U Pb zircon geochronology; garnet-phengite gneiss; Seveskollan; skandinaviska Kaledoniderna; högtrycksmetamorfos; uran-bly datering; högtrycksgnejs;

   Abstract : The Tjeliken Mountain in northern Jämtland, central Scandinavian Caledonides is by most authors considered to belong to the Lower Seve Nappe Complex (SNC). However, recently P-T conditions similar to the Middle Seve have been constrained for the eclogite at the top of the mountain, revitalizing the tectonic debate about Tjeliken. READ MORE

5. 24. U-Pb geochronology and geochemistry of host rocks to the Bastnäs-type REE mineralization in the Riddarhyttan area, west central Bergslagen, Sweden

   University essay from Lunds universitet/Geologiska institutionen

   Author : Wictor Linders; [2016]
   Keywords : Riddarhyttan; REE; Metavolcanic rocks; LA-ICP-MS; Zircon; Monazite.; Earth and Environmental Sciences;

   Abstract : The geochronology of felsic metavolcanic rocks hosting the Bastnäs-type rare earth element (REE) mineralization in the Riddarhyttan area in the Bergslagen region, Sweden, was investigated using Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) U-Th-Pb on zircon and monazite. U-Pb data from four host rock samples yield dates of 1899 ± 4 Ma (MSWD=2. READ MORE

6. 25. Mineral Chemistry and Parageneses of Oxyborates in Metamorphosed Fe-Mn Oxide Deposits

   University essay from Uppsala universitet/Institutionen för geovetenskaper

   Author : Zacharias Enholm; [2016]
   Keywords : Oxyborates; in situ boron analysis; microchemical analysis; Raman analysis; Fe-Mn oxide deposits; Långban; Nordmark; Jakobsberg; Oxyborater; in situ boranalys; mikrokemisk analys; Ramananalys; Fe-Mn-oxidmalmer; Långban; Nordmark; Jakobsberg;

   Abstract : Oxyborate minerals can represent the most important sink for boron in silica-undersaturated mineralised systems such as those of the Långban-type. Yet, their distribution, characteristics and parageneses are still not completely known. READ MORE