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Minerals, Volume 8, Issue 10

October 2018 - 57 articles

Cover Story: We report, for the first time, the presence of super-reduced (SuR), nominally ultra-high pressure (UHP) and continental crust-derived phases in chromitites from the Caribbean (Mercedita chromitite deposit, eastern Cuba). This assemblage includes moissanite (SiC) hosted in the altered matrix of the chromitite, oriented clinopyroxene and rutile lamellae in chromite, graphite-like amorphous carbon, corundum and SiO2 hosted in healed fractures in chromite grains, and native Cu and Fe-Mn alloys in heavy-mineral concentrates. The origin of this assemblage is discussed and interpreted as related to the alteration (serpentinization) process that affected the deposit at low pressure. View this paper
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Articles (57)

  • Article
  • Open Access
3 Citations
4,932 Views
22 Pages

22 October 2018

In this study, the He and Ar isotope compositions were measured for the Fe-Mn polymetallic crusts and nodules from the South China Sea (SCS), using the high temperature bulk melting method and noble gases isotope mass spectrometry. The He and Ar of t...

  • Article
  • Open Access
10 Citations
4,487 Views
11 Pages

22 October 2018

The valuable minerals in copper-nickel sulfide ore can easily be oxidized, leading to the reduction of their flotation recovery and a difficulty in separating them from gangue. In order to solve the problem, the reaction mechanism of the octanohydrox...

  • Feature Paper
  • Article
  • Open Access
9 Citations
7,584 Views
27 Pages

Economic Block Model Development for Mining Seafloor Massive Sulfides

  • Maxime Lesage,
  • Cyril Juliani and
  • Steinar L. Ellefmo

19 October 2018

To support open-pit studies related to seafloor massive sulfides mining projects, an economic block-model is required. A modular framework is proposed to produce economic block models accommodating various levels of data. The framework is illustrated...

  • Article
  • Open Access
11 Citations
4,611 Views
15 Pages

Design and Evaluation of an Expert System in a Crushing Plant

  • Claudio A. Leiva,
  • Katheryn V. Arcos,
  • Diego A. Poblete,
  • Eduardo A. Serey,
  • Cynthia M. Torres and
  • Yousef Ghorbani

19 October 2018

This document presents a proposal for designing an expert system in the Gabriela Mistral Division’s crushing plant belonging to Codelco (Chile) with the objective of maximizing stacked tonnage, allowing the improvement of operational variables...

  • Article
  • Open Access
25 Citations
34,856 Views
43 Pages

19 October 2018

Gemstones form in metamorphic, magmatic, and sedimentary rocks. In sedimentary units, these minerals were emplaced by organic and inorganic chemical processes and also found in clastic deposits as a result of weathering, erosion, transport, and depos...

  • Article
  • Open Access
37 Citations
4,847 Views
15 Pages

Oxidative Depression of Arsenopyrite by Using Calcium Hypochlorite and Sodium Humate

  • Shangyong Lin,
  • Runqing Liu,
  • Yongjie Bu,
  • Chen Wang,
  • Li Wang,
  • Wei Sun and
  • Yuehua Hu

18 October 2018

During smelting, arsenic in copper concentrates affects the product quality and causes environmental pollution. Removing arsenic minerals from copper concentrates requires environmental-friendly and cost-effective depressants for flotation separation...

  • Article
  • Open Access
10 Citations
6,366 Views
33 Pages

18 October 2018

The Mersin ophiolite, Turkey, is of typical arc type based on geochemistry of crustal rocks without any signs of mid-ocean ridge (MOR) affinity. We examined its ultramafic rocks to reveal sub-arc mantle processes. Mantle peridotites, poor in clinopyr...

  • Case Report
  • Open Access
7 Citations
3,697 Views
14 Pages

Multi-Analytical Investigation of Stains on Dimension Stones in Master Valentim’s Fountain, Brazil

  • Roberto Carlos Da Conceição Ribeiro,
  • Patrícia Marques Ferreira de Figueiredo and
  • Daniel Silva Barbutti

18 October 2018

Master Valentim’s fountain has become an important historical patrimony for Brazil, being portrayed by famous artists, among them Jean-Baptiste Debret. In 1938, it was registered as cultural heritage by the Brazilian National Historical and Art...

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Minerals - ISSN 2075-163X