1 / 24

Reconnaissance of Coal-Slurry Deposits in Indiana

Reconnaissance of Coal-Slurry Deposits in Indiana. Denver Harper Chris Dintaman Maria Mastalerz Sally Letsinger. August 1, 2006 - April 30, 2007. Sponsor: Center for Coal Technology Research Purdue University. Indiana Geological Survey Bloomington, Indiana. IGS Web Report.

princej
Download Presentation

Reconnaissance of Coal-Slurry Deposits in Indiana

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Reconnaissance of Coal-Slurry Deposits in Indiana Denver Harper Chris Dintaman Maria Mastalerz Sally Letsinger August 1, 2006 - April 30, 2007 Sponsor: Center for Coal Technology Research Purdue University Indiana Geological Survey Bloomington, Indiana

  2. IGS Web Report http://igs.indiana.edu/survey/projects/Coal_Fines/index.cfm

  3. Definitions Spoil = displaced overburden Gob = coarse-grained refuse Slurry (tailings) = fine-grained refuse Spoil (Fragmented and displaced overburden) Surface Mine Preparation Plant (Washer) Mine-Run Coal (Raw Coal) Power Plant Clean Coal Reject (Refuse) Ash Coarse-grained (gob) Fine-grained (slurry, tailings)

  4. Objectives Rapid reconnaissance using existing data in a GIS Map areal extents of coal-slurry deposits Estimate thicknesses Calculate volumes Collect preexisting chemical analyses Statistically analyze chemistry values

  5. Mapping – Data Sources Historical aerial photographs Dates: 1937 to 1980 Source: IGS archive (160 photos) Digital Orthophoto Quarter Quads (1998) National Agricultural Imagery Program (2003) Indiana Orthophotography Project (2005)

  6. Mapping – Feature Identification Coal-preparation plants Old Ben No. 2 2003 Tecumseh 1953 Pre 1978 Post 1978

  7. Mapping – Feature Identification Coal slurry deposits Slurry (fine-grained) Gob (coarse-grained) Friar Tuck Mine 1974

  8. Mapping – Depositional Settings Berms Minnehaha - 1954 Final-cut pit Airline - 1949 Spoil Chieftain 1946 1954

  9. Mapping – Complex Histories

  10. Results – Areal Extents Berm Final-cut pit Spoil Impoundment Not slurry

  11. Thickness Estimates – Data Sources Existing data sets: Topography - Digital Line Graphs (USGS) Coal Mine Information System (IGS) Drilling data - National Coal Resource Data System (USGS) Historical aerial photographs

  12. Thickness Estimations - Berms Air Quality No. 1 2003 (NOTE: Active operation. Impoundment not yet filled. Not included in final calculations.) Elevation of top of berm ~ 545 ft Elevation of bottom of impoundment ~ 445 ft Total height of Impoundment ~ 100 ft

  13. Thickness Estimations – Final-cut pits Lynnville Mine Elevation of coal ~ 395 ft Elevation of top of final-cut pit ~ 470 – 500 ft Depth of final-cut pit ~ 75 to 105 ft

  14. Thickness Estimations – Spoil deposits Assumptions: (1) Troughs completely filled. (2) Angle of draw = 30 degrees. (3) Aver. thickness = 1/8 ridge spacing. Latta Mine 1954 Ridge spacing = 66 feet Average depth of troughs = 66/8 = ~ 8.25 ft

  15. Results – Thickness Estimations

  16. Results – Volumetric Calculations

  17. Recoverable Coal - Assumptions Mineability of slurry Final-cut pits = 70 percent Spoil deposits = 60 percent Average weight density of raw slurry = 110 to 120 lbs per cubic foot Recoverable coal = 20 to 40 percent of mineable slurry Volume of raw slurry in situ = 94 to 136 million cubic yards = 22 to 69 million tons of recoverable coal “…volume of mapped CSDs represents from 22 to 69 million tons of recoverable coal. This compares with an earlier estimate made by Miller and Eggert (1982) of about 20 million tons.” - Final Report

  18. Chemical Characterization Mine sites – 10 Drill holes – 93 Samples – 473 Collection dates – 1970s through early 1980s Analyses Sulfur (weight percent, as received) Ash (weight percent, as received) Btu per pound (as received, moisture- and ash-free)

  19. Selected statistical values for 473 individual samples of coal slurry AR: as-received; MAF: moisture- and ash-free; wt %: weight percent

  20. Selected statistical values for samples from various mine sites AR: as-received; MAF: moisture- and ash-free; wt %: weight percent

  21. Slurry Disposal Preparation plant pipeline Cell 2 pipe discharge = “entry point” large, dense fragments of coal and rock Cell 1 subaerial fan coarse coal ultrafine coal and clay slurry pond “…a manmade prograding fan-delta system” -- Eggert, Miller, and Irwin (1980)

  22. Chinook - IGS Sample Locations 1996 1946 Spreadsheet: COAL_SLURRY_ANALYSES_IGS.XLS

  23. Chemical Trends – IGS Samples Spatial trends – Mixed results. Significant trends within several CSDs (Chinook and Lynnville), but not within others. Historical trends – Age of preparation plant versus quality of coal slurry Source coal beds – Quality of source coalbedversus quality of slurry Type of mining – Underground mines versus surface mines

  24. “Loss of slurry or fines in washeries…is a step in the march of progress and eventually some method of utilization will be found.” - Coal Age, 1936

More Related