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Name: Felix
Status: student
Grade: n/a
Location: Outside U.S.
Country: USA
Date: Summer 2012
Question:
What are the properties of high grade coal?


Replies:
High-grade coal contains little mineral matter, whereas lower-grade coal contains more mineral matter, mainly from mud in the peat swamp. The following slide presentation of Indiana coal gives a good general background of coal types.

http://www.purdue.edu/discoverypark/energy/assets/pdfs/cctr/outreach/Basics8-CoalCharacteristics-Oct08.pdf

---Nathan A. Unterman


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