Welcome from the Chairs
SessionsA. Mineral Processing
B. Environmental Mineralogy
C. Mineral Deposits
D. Mineral Geochemistry and Geochronology
E. Chemistry and Crystallography of Mineralogical Materials
F. Nanominerals and Mineral Surfaces
G. Poster section
Instructions for Authors
Authors are encouraged to prepare a presentation in PowerPoint or similar software, to be displayed online along with the Manuscript. Slides, if available, will be displayed directly in the website using Sciforum.net's proprietary slides viewer. Slides can be prepared in exactly the same way as for any traditional conference where research results can be presented. Slides should be converted to the PDF format before submission so that our process can easily and automatically convert them for online displaying.
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Posters will be available on this conference website during and after the event. Like papers presented on the conference, participants will be able to ask questions and make comments about the posters. Posters that are submitted without paper will not be included in the proceedings of the conference.
List of accepted submissions (11)
|Nb-Ta-Ti oxides in topaz granites of the Geyer granite stock (Erzgebirge Mts., Germany)||Miloš René||
Nb-Ta-Ti-bearing oxide minerals (Nb-Ta-bearing rutile, columbite-group minerals, W-bearing ixiolite) represent the most common host in high-F, high-P Li-mica granites and related rocks from the Geyersberg granite stock in the Krušné hory/Erzgebirge Mts. batholith. The Geyersberg granite stocks forms a pipe like granite stock composed of fine- to middle-grained, porphyritic to equigranular topaz- Li mica granites, containing up to 6 vol. % of topaz. Intrusive breccias on the NW range of the granite stock are composed of mica schist- and muscovite-gneiss fragments enclosed in fine-grained aplitic granite. Granites are partly greisenised, mainly along of steeply dipping NW-SE, and NE-SW trending faults. Quartz-Li-mica-topaz greisens are mineralised by cassiterite, arsenopyrite, wolframite and molybdenite. The high-F, high-P Li-mica Geyersberg granites, which represent the youngest granite intrusions in the Western and Middle Krušné Hory/Erzgebirge plutons, are highly fractionated S-type granites (ASI = 1.2–1.5) with Nb/Ta ratio = 0.74–1.12 and depletion in high-field-strength elements (HFS). Columbite group minerals occur usually as anhedral grains that display patchy zoning. These minerals are represented by columbite-(Fe) with Mn/(Mn+Fe) ratio ranging from 0.07 to 0.32. The rare Fe-rich W-bearing ixiolite occurs as small needle-like crystals. The ixiolite is Fe-rich with relatively low Mn/(Mn + Fe) and Ta/(Ta + Nb) values (0.10–0.15 and 0.06–0.20 respectively). Owing to the high W content (19.8–34.9 wt. % WO3, 0.11–0.20 apfu), the sum of Nb + Ta in the ixiolite does not exceed 0.43 apfu. The Ti content is 1.7–5.7 wt. % TiO2 and Sn content is relatively low (0.3–4.1 wt. % SnO2)
|Two-stage SART process: A feasible alternative for gold cyanidation plants with high zinc and copper contents||Humberto Estay Minghai Gim-Krumm Michelle Quilaqueo||
The SART process (SP) has been successfully implemented in gold cyanidation plants to address issues associated with high cyanide-soluble copper content the ores. However, this process could produce a relatively low grade precipitate, descreasing the sale price, when gold plants have high zinc and copper content in their solutions. A potential option in this case would be use of a two-stage SART process (TSSP) to produce separate zinc and copper precipitates. The additional equipment involved with this process would increase the capital cost, thereby generating concerns about the optimal range of metal contents that could justify this option. This study presents a methodology to quantify the feasible range of Cu/Zn concentrations that would justify a two-stages SART process. The study is based on a thermodynamic model and a simple economic evaluation. Results show the TSSP is preferred when the Cu/Zn ratio ranges between 0.2 and 1.5 with copper concentration higher than 500 mg/L. The TSSP appears to be a viable option to consider for gold plants having concentrations of copper and zinc higher than 500 and 350 mg/L respectively.
|First zunyite-bearing lithocap in Greece: The case of Konos Hill Mo-Re-Cu-Au porphyry system.||Constantinos Mavrogonatos Panagiotis Voudouris Paul Spry Vasilios Melfos Stephan Klemme Jasper Berndt Robert Moritz Christos Kanellopoulos||
Zunyite is a rare F- and Cl- bearing mineral related to advanced argillic alteration zones of porphyry/epithermal style mineralization and is considered as a pathfinder mineral towards high-grade Au ores. We report here the first occurrence of zunyite along with alunite, quartz, APS minerals, diaspore, pyrophyllite and kaolinite in the metallogenic province of Western Thrace.
The Konos Hill prospect in Western Thrace comprises a telescoped porphyry Mo-Re-Cu-Au system, overprinted by high-sulfidation mineralization. In low topographic levels, porphyry-style mineralization is exposed and comprises pyrite-chalcopyrite-bornite-molybdenite-rheniite-bearing quartz-stockwork. Host rocks are subvolcanic bodies of granodioritic composition that have suffered pervasive sericitic alteration. High-sulfidation epithermal-style alteration occupies the higher topographic levels and has caused significant overprinting of the porphyry-style mineralization and alteration. It consists of silicified zones related to N-S and E-W trending faults, which grade outwards to advanced argillic alteration assemblages. These assemblages are characterized by abundant alunite and quartz, with minor presence of diaspore, APS minerals, kaolinite, pyrophyllite and zunyite.
Zunyite forms euhedral crystals that reach in size up to 300μm. They sometimes include minor quartz and are associated with alunite, APS minerals and pyrophyllite. EPMA data revealed variations in the F and Cl content of zunyite, that range between 3.62-6.54 wt.% and 2.65-3.15 wt.% respectively. Alunite supergroup minerals display a wide compositional range and are represented by members of the alunite, beudanite and plumbogummite subgroups. Alunite and natroalunite constitute the most common advanced-argillic alteration minerals and are found in both quartz+zunyite and quartz+diaspore+pyrophyllite assemblages. Available mineral-chemical data favor the existence of compositions that cover a complete solid-solution series between Na- and K-rich varieties. Common mode occurrences comprise euhedral, tabular-shaped and rarely pseudocubic crystals. APS minerals are usually found as pseudocubic crystals forming the cores of tabular alunites. Analyzed compositions comprise woodhouseite (Sr-, Ce- and Sr-Ce- rich members were found). Diaspore forms aggregates of euhedral, coarse-grain crystals scattered in strongly silicified rock. Finally, pyrophyllite when present, forms acicular aggregates in the matrix along with diaspore and quartz.
Available data suggest that the formation of the studied advanced argillic alteration assemblages is hypogene and due to ascending magmatic fluids released by the subvolcanic bodies. Mineralogical variances in the different assemblages may reflect distinct degrees of hydrothermal alteration. Co-existence of zunyite, APS minerals and pyrophyllite could be used to set constraints on the physicochemical conditions of formation of the assemblage, as the volatile-rich nature of the minerals reflects a narrow range of pH and temperature in hydrothermal systems.
|The Ni-Bi-Au association at Kamariza and ‘km-3’, Lavrion ore district, Greece||Emmanouil Galanos Panagiotis Voudouris Branko Rieck Uwe Kolitsch Constantinos Mavrogonatos Vasilios Melfos Stephanos Zaimis Konstantinos Soukis||
The Lavrion ore district, located about 50 km southeast of Athens (Greece), contains a variety of ore types including porphyry Mo-W, skarn Fe-Cu-Bi-Te, carbonate-replacement Pb-Zn-Cu-Ag±Au-Bi and vein-type Pb-As-Sb-Ag and Pb-Ni-Bi-Au (Solomos et al. 2004; Voudouris et al. 2008; Bonsall et al. 2011; Kolitsch et al. 2015). Mineralization was synchronous to the intrusion of a Miocene granodiorite body in the footwall of the Western Cycladic Detachment System and related felsic dikes and sills within marbles and schists, which locally cross-cut the detachment. Carbonate-sericite altered microgranodioritic dikes and sills at Kamariza are crosscut by porphyry-style quartz-sericite-calcite stockworks hosting pyrrhotite, pyrite, arsenopyrite, chalcopyrite and sphalerite (e.g. the same metallic minerals present in the carbonate-replacement and vein ores). The dikes and sill display enrichment in Ni (up to 220 ppm), Cu (up to 175 ppm), As (up to 510 ppm), Mo (up to 6 ppm) and Pb (up to 830 ppm), as measured by ICP-MS. The Ni-Bi-Au association at the Clemence mine in Kamariza is a vein-type mineralization developed at the contact between marbles and schists. The mineralization also expands in the marbles unit, forming carbonate-replacement bodies. It consists of native gold and bismuthinite intergrown with gersdorffite, enclosed in galena. Bulk ore analyses reveal Au and Ag grades exceeding 100 ppm, Pb and Zn > 1 wt. %, Ni up to 9700 ppm, Co up to 118 ppm, Sn > 100 ppm and Bi > 2000 ppm. New mineralogical and mineral-chemical data from the Ni-Bi-Au association suggest gold deposition with oscillatory zoned gersdorffite following initial deposition of pyrite and arsenopyrite. Oscillatory zoning in gersdorffite is related to variable As, Ni and Fe contents, indicating fluctuation of arsenic fugacity in the hydrothermal fluid. Chalcopyrite, tennantite and enargite rimming gersdorffite suggest an evolution towards higher sulfur fugacity in the mineralization with time. Stannite enclosed in pyrite and native antimony enclosed in galena are decribed here for the first time in the Clemence ore assemblage. At the ‘km-3’ locality, the Ni sulfides and sulfarsenides, vaesite, millerite, ullmannite and polydymite, are enclosed in gersdorffite and/or galena. At this location mineralization occurs in the form of calcite and galena veins crosscutting and cementing brecciated marbles, within the detachment fault. Mineralization is enriched in Mo (up to 36 ppm), As and Ni (both >1 wt. %), Co (up to 1290 ppm), whereas other elements occur in lesser amounts: Te (up to 2 ppm), Sn (up to 8.5 ppm), Bi (up to 1.3 ppm). Gersdorffite at ‘km-3’ is homogenous and contain less Fe (up to 2 wt. %) than that from the Clemence mine (up to 9 wt. %), probably related to lower temperatures of their formation. The geochemical and mineralogical data from this study support previous models for a magmatic contribution of metals to the ore system, although a remobilization from previous mineralization and/or country rocks cannot be ruled out.
|Gold deposits in Greece: Hypogene ore mineralogy as a guide for exploration||Panagiotis Voudouris Paul Spry Vasilios Melfos Karsten Haase Reiner Klemd Constantinos Mavrogonatos Alexander Repstock Dimitrios Alfieris||
A common feature of precious metal mineralization in Greece is the close relationship between gold and silver with other trace minerals incorporating bismuth, tellurium and selenium in their structure. These minerals can be considered as pathfinders for gold as they may guide exploration to discover distinct types of gold-bearing ores. Primary gold mineralization in Greece can be subdivided in three groups regarding the mineral associations with gold: (A1) mineralization where native gold and Au-Ag tellurides accompany either Bi-sulfosalts, native Bi and reduced-type Bi-sulfotellurides (joséite-A, joséite-B, pilsenite) at Koronouda, Laodikino/Kilkis area, Stanos, Olympias-Stratoni and Fissoka at Chalkidiki area and Angistron Mt/W. Rhodope), or (A2) accompany Bi-sulfosalts with oxidized-type Bi-sulfotellurides (e.g. tetradymite and tellurobismuthite) typical for Aberdeen, Palea Kavala, Thasos island, as well as for the calc-alkaline and alkaline-hosted porphyry and epithermal deposits/prospects in western Thrace, Limnos island and Skouries; (B) deposits which lack tellurides but include Bi-sulfosalts and native gold (e.g. the carbonate replacement deposit of Lavrion, the porphyry-Cu-Mo-Au deposits of Maronia and Stypsi, Lesvos Island, and the intrusion-related Kimmeria Cu-Mo-Au deposit); and (C) deposits/prospects where native gold and Au-Ag-tellurides and other base metal tellurides are abundant and Bi-tellurides and Bi-sulfosalts are missing (the metamorphic rock-hosted quartz veins at Panormos/Tinos and Kallianou/Evia Islands, and the epithermal shallow submarine mineralization at Milos). Bismuth and tellurium are considered to be derived from magma and recognition of bismuth sulfosalts and bismuth tellurides, as well as of various types of base (and precious) metal tellurides in the mineralization, is a strong evidence of magmatic-hydrothermal contribution and of adjacent concealed intrusives (e.g. Perama Hill and Pefka deposits are cases where no granitoids are exposed). The absence of bismuth minerals and the presence of precious and base metal tellurides (as is the case for Milos, Tinos and Evia islands) may still suggest magmatic contributions but in more distal setting from a buried granitoids at depth. Selenium (and/or bismuth) bearing galena and Se-bearing bismuth chalcogenides present at Kimmeria intrusion-hosted veins, at Lavrion, as well as in several porphyry-epithermal deposits in northern Greece (e.g. Kassiteres-Sapes, Pagoni Rachi, Perama Hill, Pefka and Skouries) are indicative of high-temperature, initial stages of ore deposition from magmatic-hydrothermal fluids, and proximity to porphyry mineralized centers. When recognized in a mineralization as an accessory mineral, Se-bearing galena could guide exploration towards unexposed granitoids. Bornite and molybdenite are present in the potassic and sericitic alteration zones of Skouries and Pagoni Rachi porphyry deposits, where they are intimately associated with native gold and gold-silver tellurides. However bornite may also occur in intermediate-sulfidation epithermal veins at Kassiteres-Sapes and Pagoni Rachi areas and molybdenite at Stanos and Syros Island without any obvious relationship to a granitoid. Both minerals can be applied for discovery of high temperature mineralized zones in the system.
Prof. Dr. Paul Sylvester
Texas Tech University, USA
Prof. Dr. Saeed Chehreh Chelgani, University of Michigan, USA
Prof. Dr. Karen Hudson-Edwards, University of Exeter, UK
Prof. Dr. David Chew, Trinity College Dublin, Ireland
Assoc. Prof. Panagiotis Voudouris, National and Kapodistrian University of Athens, Greece
Dr. Sytle M. Antao, University of Calgary, Canada
Dr. Runliang Zhu, Guangzhou Institute of Geochemistry Chinese Academy of Sciences, China
Scientific Advisory Committee Members
Prof. Dr. Antonio Simonetti, University of Notre Dame, USA
Dr. Zhiyong Gao, Central South University, China
Dr. Pablo Cubillas, Durham University, UK
Ms. Sweater Shi
E-Mail: [email protected]
Call for Papers
The section Chairs and the scientific committee members are pleased to announce the Call for Papers for the 1st International Electronic Conference on Mineral Science and to invite each researcher working in this exciting field of science to share his/her recent results with his/her colleagues around the world.
The conference will be organized into six sections, which reflect the minerals and mineralogy. It will cover a wide range of aspects, please see the details in each section.
Researchers are invited to provide a short abstract on line at http://www.sciforum.net/login from now until 31 May 2018. Acceptance will be notified within two weeks after submission of the abstract. Then the author(s) will be asked to submit the manuscript, optionally along with a slide show (PPT) (or a video) using the template provided by the conference (see Instructions for Authors). All accepted submissions will be displayed online, at https://sciforum.net/conference/IECMS2018, for discussion during 16-31 July 2018.
Accepted papers will be published in the Journal Proceedings. After the conference, the authors are recommended to submit an extended version of the proceeding papers to the Minerals Special issue with 20% discount of the APC charges.
The Scientific Committee looks forward to receiving contributions in response to this call and will be glad to provide any further information to interested parties. Questions may be addressed to the conference organizer at [email protected] or Minerals editorial office at [email protected].
We thank you in advance for your attendance of this conference and look forward to a stimulating exchange.
A. Mineral Processing
Prof. Dr. Saeed Chehreh Chelgani, Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI 48109, USA
As high grade ores have been somewhat depleted, low grade complex deposits are becoming the main source of valued minerals. These disseminated and complicated ores, however, include a huge amount of non-value (unwanted) minerals. The main purpose of mineral processing is to reduce the bulk of the ore which must then be transported to and processed in the smelter. In other words, mineral processing is a combination of relatively cheap methods for separating the valuable minerals from the waste non-value (gangue) minerals. Size (liberation) and mineral properties are two general factors taken into account in mineral separation and processing. Papers for this Section on mineral processing include, without being limited to, the following themes:
- Gravity separation
- Magnetic separation
- Froth flotation
B. Environmental Mineralogy
Prof. Dr. Karen Hudson-Edwards, Environment & Sustainability Institute and Camborne School of Mines, University of Exeter, Penryn Cornwall TR10 9DF, UK
Environmental minerals, like “traditional” minerals, are naturally-occurring solids with definite chemical compositions. Unlike “traditional” minerals, however, they can be formed by both inorganic and organic processes, range from very poorly crystalline to crystalline, and are found in natural and engineered environments such as mines or nuclear waste disposal sites, or biological systems such as the human body. Environmental minerals control the transport and availability of nutrients and contaminants in waters, soils, sediments and dusts. The Environmental Mineralogy Section invites contributions on, but not restricted to, the following themes:
- Characterisation of environmental minerals in Earth surface environments
- Uptake of contaminants and nutrients in environmental minerals
- The environmental mineralogy of mine wastes, contaminated soils, dusts and nuclear wastes
- Environmental biominerals in Earth surface systems and the human body
- Bacteria, archaea, fungi and the formation of environmental minerals
C. Mineral Deposits
Assoc. Prof. Panagiotis Voudouris, National and Kapodistrian University of Athens, 157 84 Athens, Greece
Mineral deposits are an essential supply of appropriate commodities for global industrialization. They often show specific associations with particular geologic terrains and vary in abundance as a function of geological time. Many factors are important for the formation of the mineral deposits, including the geotectonic environment, regional structural control, the petrography and geochemistry of the host rocks, the geochemistry of the ore-forming fluids, and the mineral paragenesis, textures and chemistry, etc. These factors affect exploration projects and the mining and extraction processes of the companies which invest considerable amounts of capital to extract the metals, minerals and rocks from deep in the Earths’ crust. Ore-forming models have been generated based on these factors but need modifying as the results of new research are forthcoming. Here, we evaluate how ore deposits form and the ways minerals can be used as pathfinders to the discovery of new deposits.
The Mineral Deposits section is open for contributions on, but not restricted to, the following topics:
- Mineralogy of precious, rare and critical metals in magmatic-hydrothermal ore deposits
- Mineralogy of supergene ore deposits
- The use of mineral compositions in the search for mineral deposits
- Indicator minerals as vectors to ore deposits
- Metal enrichment in existing ore deposits as a result of igneous and metamorphic processes
D. Mineral Geochemistry and Geochronology
Prof. Dr. David Chew, Department of Geology, Trinity College Dublin, Dublin 2, Ireland
Many new discoveries are being made and problems encountered in the geosciences by looking at individual minerals in exquisite detail at a microscopic level. The "Mineral Geochemistry and Geochronology" Section invites contributions that improve our understanding of the Earth and Solar System using techniques capable of analysing mineral samples at high spatial and temporal resolution.
Contributions on, but not restricted to, the following topics are welcomed:
- Exploration and mining geology
- Advances in mineral analytical techniques
- Innovations in accessory mineral U-Th-Pb petrochronology
- Mineral geochemistry applied to ore deposit processes
- Geochronology and thermochronology applied to geological processes
E. Chemistry and Crystallography of Mineralogical Materials
Dr. Sytle M. Antao, Department of Geoscience, University of Calgary, Calgary, Alberta T2N 1N4, Canada
The Chemistry and Crystallography Section covers all fundamental aspects of chemistry, crystal structure determination and refinements, properties, phase transitions, and formation conditions of materials of mineralogical interests. We invite contributions to the following topics:
- New approaches in mineralogy, crystallography, and mineral physics
- Ambient and non-ambient crystal chemistry
- Synchrotron and neutron techniques used to investigate material properties
- Reconstructing mineral history and formation conditions
- Biominerals and applications of mineralogy in medicine
F. Nanominerals and Mineral Surfaces
Dr. Runliang Zhu, Guangzhou Institute of Geochemistry Chinese Academy of Sciences, Guangzhou 510640, China
Mineral surfaces have drawn the interest of scientific communities from several disciplines, in particular earth, environmental, geochemical, soil, and mineral sciences, as a variety of reactions can take place on mineral surfaces, including surface hydration, hydroxylation, adsorption/desorption, surface precipitation, crystal growth, mineral dissolution, oxidation/reduction, catalysis, etc. These reactions then play a central role in many important processes taking place on earth, e.g., the formation and weathering of minerals and rocks; the formation of ore deposits; the formation of soil; geochemical cycling of the elements (with those related to sustainable development of the environment being of particular concern); bioavailability of contaminants and nutrients; self-cleaning of the environment; recording of environmental information; the origins of life. In addition, these reactions can also be applied for various purposes, such as ore processing and extraction, synthesis and applications of mineral-based materials (e.g., mineral-based catalysts, adsorbents, and flocculants).
Modern characterization techniques (e.g., synchrotron-based spectroscopic and scattering methods) in combination with molecular modelling methods, provide atomic-level information to help understand the microstructure and physicochemical properties of minerals surfaces and the reactions that take place. Significant advances have been achieved in this research area in recent decades. However, there is much left to be discovered, particularly because reactions on mineral surfaces are closely related to the environmental quality of near-surface earth, and the sustainable development of humanity.
Nanominerals and mineral nanoparticles are widely distributed in soil, the atmosphere, oceans, groundwater and surface waters, and even in living organisms. Due to the significant size-effects and large portion of surface atoms, nanominerals and mineral nanoparticles are expected to have large mineral surfaces and strong surface reactivity. In this regard, nanominerals and mineral nanoparticles play an important role in a variety of earth and environmental processes, and have been the subject of much current research. The strong surface reactivity of nanominerals and mineral nanoparticles makes them prominent geosorbents and natural catalysts, affecting the geochemical cycling of elements, formation/dissolution of minerals, environmental fate of contaminants, self-cleaning of contaminated sites, etc.
Similarly, in recent years, modern characterization techniques (e.g., powerful high-resolution transmission electron microscopes) help significantly for exploring the microstructure, physicochemical properties, and geochemical behaviors of nanominerals and mineral nanoparticles. However, there still remains huge gaps in our understanding of this research area.
This electronic conference intends to establish a platform for exchanging recent advances in the fields of minerals surfaces and nanominerals, which covers the broad scope of studies mentioned above.