نتایج جستجو برای: kenticha tantalite ore mine

تعداد نتایج: 33103  

Journal: :Journal of the Mining and Metallurgical Institute of Japan 1961

2004
M. Godoy R. Dimitrakopoulos

Open pit mine design and production scheduling deals with the quest for the most profitable mining sequence over the life of a mine. The dynamics of mining ore and waste and the spatial grade uncertainty make predictions of the optimal mining sequence a challenging task. A new optimization approach to production scheduling based on the effective management of waste mining and orebody grade unce...

Journal: :Geosciences 2022

Niobium and tantalum are mainly produced from columbite–tantalite ores, 60% of their production is nowadays located in the Democratic Republic Congo Rwanda. The concentration supply, scarcity, wide range use all electronic devices, expected future demand boosted by clean digital transition means that Nb Ta have high supply risks. In this context, extraction rich tailings abandoned mines could p...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1999
R P Nolan A M Langer R Wilson

The potential for health risks to humans exposed to the asbestos minerals continues to be a public health concern. Although the production and use of the commercial amphibole asbestos minerals-grunerite (amosite) and riebeckite (crocidolite)-have been almost completely eliminated from world commerce, special opportunities for potentially significant exposures remain. Commercially viable deposit...

2017

Mining and metallurgy have negative consequences for the environment [1-3] and lead to changes in geological [4] and climatic conditions [5]. Mining-metallurgy operations include the extraction, preparing of ores (crushing ore and flotation), processing of concentrates, and the disposal of waste rock and by-products. The main waste in mining and metallurgy are waste rocks, flotation tailings an...

2010
Lesley Andrews

Some idea of the possibilities of microbeam techniques can be illustrated by examining the following example of a run of mine gold ore sample. Milling and bulk chemical analysis of the ore will provide major and minor element analysis as well as the gold grade. More detailed chemistlY can also reveal the presence of trace elements that may be advantageous or deleterious to downstream processing...

Journal: :Journal of environmental sciences 2007
Chun-bo Hao Hong-xun Zhang Zhi-hui Bai Qing Hu Bao-guo Zhang

Waste ore samples (pH 3.0) were collected at an acid mine drainage (AMD) site in Anhui, China. The present acidophilic microbial community in the waste ore was studied with 16S rRNA gene clone library and denaturing gradient gel electrophoresis (DGGE). Eighteen different clones were identified and affiliated with Actinobacteria, low G + C Gram-positives, Thermomicrobia, Acidobacteria, Proteobac...

Journal: :European Journal of Operational Research 2017
Eduardo Moreno Mojtaba Rezakhah Alexandra Newman Felipe Ferreira

The open pit mine production scheduling (OPMPS) problem seeks to determine when, if ever, to extract each notional, three-dimensional block of ore and/or waste in a deposit and what to do with each, e.g., send it to a particular processing plant or to the waste dump. This scheduling model maximizes net present value subject to spatial precedence constraints, and resource capacities. Certain min...

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