Results 51 to 60 of about 6,899 (241)

Petrology and geochemistry of volcanic rocks of Cheshmeh Khuri and Shekasteh Sabz areas, Khur, northwest of Birjand [PDF]

پترولوژی, 2016
Khur area is located in east of Iran and northwest of Birjand. The area comprises outcrops of Eocene to Oligocene volcanics with basaltic andesite to rhyolite composition, which were intruded by subvolcanic and intrusive bodies of granodiorite to gabbro.
Maryam Javidi Moghaddam, Mohammad Hassan Karimpour, Khosrow Ebrahimi Nasrabadi, Azadeh Malekzadeh Shafaroudi, Mohammad Reza Hidarian Shahri   +4 more
doaj  

Co AND Ni MINERALS IN ORES OF THE MIKHEEVSKOE PORPHYRY Cu DEPOSIT (SOUTH URALS) [PDF]

Минералогия
Co and Ni minerals are described in ores of the Mikheevskoe porphyry copper deposit (South Urals, Russia). Minerals of the cobaltite–gersdorfite series (CoAsS–NiAsS), violarite (FeNi2S4), millerite (NiS), pentlandite (Ni5.5Fe3.4)8.9S8.0 and melonite ...
O.Yu. Plotinskaya, E.V. Kovalchuk
doaj   +1 more source

Variable Temperature Studies of Two Calcium Uranates α‐Ca3UO6 and Ca2UO5

Chemistry – A European Journal, EarlyView.
The structures and thermal responses of the calcium uranates α‐Ca3UO6 and Ca2UO5 were investigated using in situ synchrotron x‐ray diffraction and neutron powder diffraction. Despite the very similar chemical compositions, the structural response of the two calcium uranates is shown to be complex and varied.
Maria K. Nicholas, Timothy A. Ablott, Caleb J. Bennett, Bryce G. Mullens, Helen E. Maynard‐Casely, Wen Liang Tan, Jeremy L. Wykes, Yingjie Zhang, Brendan J. Kennedy   +8 more
wiley   +1 more source

Interpretation of Lineaments Within the Western Part of the Baikal-Patom Belt Using a Multiscale Tectonophysical Approach in the Context of Ore-Forming Systems Prediction

Georesursy
In the article, using the territory of the western part of the Baikal-Patom belt as an example, an author’s approach to the automatic extraction of lineaments reflecting various scale levels of the development of the fault network framework is proposed ...
S. A. Ustinov, V. A. Petrov, A. A. Andreev, A. D. Svecherevsky, I. A. Kochkin, V. V. Shukhov   +5 more
doaj   +1 more source

Gold and other impurity elements in pyrite from the Berezovskoe deposit in the Middle Urals

Литосфера, 2019
Research subject. In this work, we investigated the crystals of pyrite, one of the key gold-bearing minerals, from the Berezovskoe (the Middle Urals) deposit using modern research approaches.Materials and methods.
N. V. Sidorova, I. V. Vikent’ev, V. D. Abramova, E. V. Koval’chuk   +3 more
doaj   +1 more source

Tunable amylopectin graft copolymers for flocculating and dewatering iron ore tailings

The Canadian Journal of Chemical Engineering, EarlyView.
Abstract Polyacrylamide (PAM), the standard flocculant for mining tailings, often produces turbid supernatants and poorly dewatered sediments, limiting water reuse and tailings densification. We synthesized amylopectin‐graft‐poly[(2‐methacryloyloxy)ethyl]trimethylammonium chloride (AP‐g‐PMETAC) copolymers with systematically varied graft frequency (N = 
Gustavo P. Zago, Reinaldo Giudici, João B. P. Soares   +2 more
wiley   +1 more source

Quantification of rheological parameters in deep‐sea mining plumes

Deep Underground Science and Engineering, EarlyView.
This study explores the variations in rheological properties observed during the propagation of deep‐sea mining plumes, utilizing rheological test data obtained from kaolin clay plumes. Subsequently, taking into account the differences in sediment properties, the effects of clay content and clay mineral composition on the rheological parameters of ...
Xiaolei Liu, Yihan Liu, Yonggang Jia, Xingsen Guo   +3 more
wiley   +1 more source

Peculiarities of formation, isomorphism and geochemistry of trace elements of sphalerite and wurtzite unusual varieties from the Goniatite occurrence (Pai-Khoi Ridge, Nenets Autonomous District)

Записки Горного института
A unique Mn-, Cd-bearing sphalerite from quartz-calcite veins in the coal-bearing series (Visean C1v) marine sediments in a 50 km segment of the middle course of the Silova-Yakha River in the Arctic zone of the European part of Russia (Pai-Khoi Ridge ...
Aleksandr B. Makeyev, Ilya V. Vikentyev, Elena V. Kovalchuk, Vera D. Abramova, Vsevolod Yu. Prokofyev   +4 more
doaj  

The Role of Placer Deposits in Ensuring the Reproduction of the Mineral Resource Base of Scarce Types of Strategic Mineral Raw Materials in Russia at the Present Stage

Russian Journal of Earth Sciences
Placer deposits had (and for a number of components still have) an important role in providing strategic types of mineral resource base for both Russia and the world as a whole.
Bortnikov N. S., Volkov A. V., Lalomov A. V., Bochneva A. A., Ivanova Yu. N., Lalomov D. A.   +5 more
doaj   +1 more source

Geological and geotechnical challenges on the Great Dyke of Zimbabwe and their impact on hardrock pillar design

Deep Underground Science and Engineering, EarlyView.
The Great Dyke of Zimbabwe is notable for its rich platinum group metal deposits but poses significant geological and geotechnical challenges due to its complex rock types and structural features. Traditional pillar design methods are insufficient for addressing these complexities; the study suggests incorporating advanced techniques such as machine ...
Tawanda Zvarivadza, Hendrik Grobler, Moshood Onifade, Manoj Khandelwal   +3 more
wiley   +1 more source