Energy Resources Program
Tuesday, September 07, 2010
USGS Publication: Open-File Report 2010–1196The main objective of the World Coal Quality Inventory (WoCQI) was to collect and analyze a global set of samples of mined coal during a time period from about 1995 to 2006 (Finkelman and Lovern, 2001). Coal samples were collected by foreign collaborators and submitted to country specialists in the U.S. Geological Survey (USGS) Energy Program.
Wednesday, September 01, 2010
USGS Publication: Open-File Report 2010–1114Between 1999 and 2007, the U.S. Geological Survey (USGS) investigated coalbed methane (CBM) resources in the Wyoming portion of the Powder River Basin. The study also included the CBM resources in the North Dakota portion of the Williston Basin of North Dakota and the Wyoming portion of the Green River Basin of Wyoming. This report presents megascopic lithologic descriptive data collected from canister samples extracted from the 37 wells cored for this project.
USGS Publication: Scientific Investigations Report 2010–5152
his report contains a simplified provisional correlation chart that was compiled from both published and unpublished data in order to fill a need to visualize the currently accepted stratigraphic relations between Appalachian basin formations, coal beds and coal zones, and key stratigraphic units in the northern, central, and southern Appalachian basin coal regions of Alabama, Tennessee, Kentucky, Virginia, West Virginia, Ohio, Maryland, and Pennsylvania.
Thursday, April 01, 2010
Outside Publication: Journal of Environmental and Public Health
Indoor air pollution has been identified as a major risk factor for acute and chronic respiratory diseases throughout the world. In the sovereign Navajo Nation, an American Indian reservation located in the Four Corners area of the USA, people burn coal in their homes for heat.In twenty-five percent of homes surveyed coal was burned in stoves not designed for that fuel, and indoor air quality was frequently found to be of a level to raise concerns. NOTE: This report is presented in Portable Document Format (PDF). Download the latest version of Adobe Reader, free of charge.
The U.S. Geological Survey (USGS) Energy Resources Program, in cooperation with many agencies and scientists from the world’s coal producing countries, undertook a project, called the World Coal Quality Inventory (WoCQI), to obtain samples of coal from the world’s producing coal mines during a limited period of time (roughly 1995-2006). The resulting WoCQI database is intended to help policy makers with decisions regarding:
This can contribute to the most economically and environmentally efficient global use of coal.
International collaborators were provided sample collecting guidelines and forwarded their samples to the U.S. Geological Survey (USGS). Samples were subsequently analyzed for major-, minor-, and trace-elements at the USGS Inorganic Geochemistry Laboratory located in Denver, CO and for proximate and ultimate analyses at a commercial laboratory located in Pennsylvania using ASTM methods (2007). The resulting dataset, in EXCEL 2003 format, includes samples from 56 countries and is not subject to the inter-laboratory variability present in many coal chemistry compilations.
Not all global coal resource occurrences are included in the WoCQI, but 1,580 individual coal samples were eventually collected for analysis. About 70 percent of the WoCQI samples have data from the commercial laboratory, which are presented on an as-received basis. Values for nearly 50 elements from the USGS laboratory were calculated to a consistent dry, whole-coal basis in the dataset.
The WoCQI database is a unique compilation of coal chemical data and in some cases, the WoCQI data may be the only data available for public use. Care must be used when selecting the sample data for use in statistics or interpretation for the following reasons:
1) There are single samples with little or no spatial variability
2) There is a mix of sample types and collection methods
3) The accuracy of the USGS Inorganic Geochemistry Laboratory major-, minor-, and trace-element data is variable
Five newsletters (see archive) were published during the sample collection phase to keep communications open between international collaborators and the USGS. For samples from South American countries, the USGS published an open-file report in 2006 (Karlsen and others, 2006) and the Indonesian samples in 2007 (Belkin and Tewalt, 2007). Although no Geographic Information System (GIS) files are part of the WoCQI, two publications containing international coal-bearing areas have been produced and can be used in conjunction with the WoCQI chemistry data (western hemisphere: Tewalt and others, 2008 ; Africa: Merrill and Tewalt, 2008). Ongoing coal-related international studies relate to the creation of GIS shape files for coal-bearing areas of the world. Please check the News tab for the most recent releases.
Belkin, H.E., and Tewalt, S.J., 2007, Geochemistry of selected coal samples from Sumatra, Kalimantan, Sulawesi, and Papua, Indonesia: U.S. Geological Survey Open-File Report 2207-1202, available online at http://pubs.usgs.gov/of/2007/1202/
Karlsen, A.W., Tewalt, S.J., Bragg, L.J., and Finkelman, R.B., eds., 2006, The World Coal Quality Inventory: South America: U.S. Geological Survey Open-File Report 2006-1241, available online at http://pubs.usgs.gov/of/2006/1241/
Merril, M.D., and Tewalt, S.J., 2008, GIS Representation of Coal-Bearing Areas in Africa: U.S. Geological Survey Open-File Report 2008-1258, available online at http://pubs.usgs.gov/of/2008/1258/
Tewalt, S.J., Kinney, S.A, and Merrill, M.D., 2008, GIS Representation of Coal-Bearing Areas in North, Central, and South America: U.S. Geological Survey Open-File Report 2008-1257, available online at http://pubs.usgs.gov/of/2008/1257/
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World Coal Quality Inventory (WoCQI) Spatial Viewer:
This viewer allows users to select a country and download underlying data associated with countries that were working collaboratively to sample and inventory coal.
Download All Chemical Data:
Chemical Analyses in the World Coal Quality Inventory, Version 1:
Open-File Report 2010-1196
Additional International Chemical Data [.xls]
Metadata for Additional International Chemical Data [.txt]
Petrographic analyses and selected photomicrographs of WoCQI samples -- Read Me [.docx]
Selected photomicrographs provided by University of Kentucky Center for Applied Energy Research -- Appendix A [.pdf]
Petrographic analyses in spreadsheet format provided by University of Kentucky Center for Applied Energy Research -- Appendix B [.xls]
USGS Frequently Asked Questions (FAQ) Pertaining to "Coal"
Energy Resources Program - Coal Quality
Energy Resources Program - Coal Databases
Energy Resources Program - Geochemistry Laboratories
American Society of Testing Materials (ASTM)
Center for Applied Energy Research
International Committee for Coal & Organic Petrology (ICCP)
The Society for Organic Petrology (TSOP)
Page Last Modified: Friday, October 13, 2017