mining coal selective

  • Submicrometer elemental carbon as a selective measure of ...

    Submicrometer elemental carbon as a selective measure of diesel particulate matter in coal mines M. Eileen Birch*a and James D. Nollb a US Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, .

  • Selective bibliography of surface coal mining and ...

    @article{osti_5903895, title = {Selective bibliography of surface coal mining and reclamation literature. Volume 2. Interior Coal Province}, author = {Patricoski, M. L. and Daniels, L. K. and Sobek, A. A.}, abstractNote = {This bibliography has been compiled for use by researchers, students, and other groups who need a reference source of published literature related to surface coal mining and ...

  • 7 Alternatives for Future Coal Waste Disposal | Coal Waste ...

    Washington, DC: The National Academies Press. doi: 10.17226/10212. ... Figure 7.1 shows that through selective mining and other means, coal preparation needs can be restricted to Level 3 (Sidebar 7.2) and below, thus producing only limited fine coal waste slurry. If coal is cleaned to Level 4, the options of waste utilization and alternative ...

  • Which practice can be categorized as a sustainable ...

    Which practice can be categorized as a sustainable practice? a) Strip- mining for coal b) slash and burn farming c) selective cut forestry d) urban sprawl city planning

  • Mining - Underground mining | Britannica

    Mining - Mining - Underground mining: When any ore body lies a considerable distance below the surface, the amount of waste that has to be removed in order to uncover the ore through surface mining becomes prohibitive, and underground techniques must be considered. Counting against underground mining are the costs, which, for each ton of material mined, are much higher underground than on the ...

  • Definition of selective mining - mindat glossary

    Selective methods of stoping are square-set stoping, open stoping in low-dipping beds, and cut-and-fill stoping. iii. In coal mining, selective methods may be dictated by market demands and prices. It may be desirable to work the different quality coal seams in such proportions as to obtain a uniform and salable blend over a period of years.

  • CDC - Mining - Submicrometer Elemental Carbon as a ...

    A standard based on particulate carbon is not considered practical because of coal dust interference. Interference may not be a problem if an appropriate size-selective sampler and EC exposure standard are employed. Submicrometer dust concentrations found in previous surveys of nondieselized, underground coal mines were relatively low.

  • Mining Stock Photos And Images - 123RF

    Download Mining stock photos. Affordable and search from millions of royalty free images, photos and vectors. Photos. ... Selective Focus. Pattern. Vibrance. More. ... Coal mining in an open pit. Miner looking on the huge excavator... Similar Images

  • WIRTGEN | Surface Miner 220 SM 3.8 Selective hard ...Click to view on Bing3:14

    Dec 10, 2018 · Become acquainted with the operating principle and technical components of the surface mining technology. Get to know our state-of-the-art cutting technology, and learn more about new methods in ...