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Year Published: 2016

Collaborative Studies for Mercury Characterization in Coal and Coal Combustion Products, Republic of South Africa

Mercury (Hg) analyses were obtained for 42 samples of feed coal provided by Eskom, the national electric utility of South Africa, representing all 13 coal-fired power stations operated by Eskom in South Africa. This sampling includes results for three older power stations returned to service starting in the late 2000s. These stations were not...

Kolker, Allan; Senior, Constance L.; van Alphen, Chris
Kolker, Allan, Senior, C.L., and van Alphen, Chris, 2014, Collaborative studies for mercury characterization in coal and coal combustion products, Republic of South Africa (ver. 2.0, May 2016): U.S. Geological Survey Open-File Report 2014–1153, 47 p., http://dx.doi.org/10.3133/ofr20141153.

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Year Published: 2016

Aptian ‘Shale Gas’ Prospectivity in the Downdip Mississippi Interior Salt Basin, Gulf Coast, USA

This study evaluates regional ‘shale gas’ prospectivity of the Aptian section (primarily Pine Island Shale) in the downdip Mississippi Salt Basin (MSB). Previous work by the U.S. Geological Survey estimated a mean undiscovered gas resource of 8.8 trillion cubic feet (TCF) in the chronostratigraphic-equivalent Pearsall Formation in the Maverick...

Hackley, Paul C.; Valentine, Brett J.; Enomoto, Catherine B.; Lohr, Celeste D.; Scott, Krystina R.; Dulong, Frank T.; Bove, Alana M.

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Year Published: 2015

Preliminary methodology to assess the national and regional impact of U.S. wind energy development on birds and bats

The U.S. Geological Survey has developed a methodology to assess the impacts of wind energy development on wildlife; it is a probabilistic, quantitative assessment methodology that can communicate to decision makers and the public the magnitude of these effects on species populations. The methodology is currently applicable to birds and bats,...

Diffendorfer, J.E.; Beston, Julie A.; Merrill, Matthew D.; Stanton, J.C.; Corum, M.D.; Loss, Scott R.; Thogmartin, Wayne E.; Johnson, Douglas H.; Erickson, Richard A.; Heist, Kevin W.
Diffendorfer, J.E., Beston, J.A., Merrill, M.D., Stanton, J.C., Corum, M.D., Loss, S.R., Thogmartin, W.E., Johnson, D.H., Erickson, R.A., and Heist, K.W., 2015, Preliminary methodology to assess the national and regional impact of U.S. wind energy development on birds and bats: U.S. Geological Survey Scientific Investigations Report 2015–5066, 40 p., http://dx.doi.org/10.3133/sir20155066.

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Year Published: 2015

Late Jurassic – early Cretaceous inversion of rift structures, and linkage of petroleum system elements across post-rift unconformity, U.S. Chukchi Shelf, arctic Alaska

Basin evolution of the U.S. Chukchi shelf involved multiple phases, including Late Devonian–Permian rifting, Permian–Early Jurassic sagging, Late Jurassic–Neocomian inversion, and Cretaceous–Cenozoic foreland-basin development. The focus of ongoing exploration is a petroleum system that includes sag-phase source rocks; inversion-phase reservoir...

Houseknecht, David W.; Connors, Christopher D.

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Year Published: 2015

The continuing medical mystery of Balkan Endemic Nephropathy

Balkan Endemic Nephropathy (BEN) is a disease of subtle onset and insidious progression that typically occurs between the 4th and 6th decade in long‐resident individuals in highly specific geographic locations of the Balkan region and affects 1 – 5% of the population. Though it does not follow typical Mendelian genetics, there is a familial...

Crosby, Lynn M.; Tatu, Calin A.; Orem, William H.; Pavlovic MD PhD, Nikola

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Year Published: 2015

The U.S. Geological Survey coal quality (COALQUAL) database version 3.0

Since the mid-1970s, the U.S. Geological Survey (USGS) has maintained a coal quality database of national scope named USCHEM, which currently contains data for over 13,000 samples. A subset of the USCHEM database called COALQUAL Version 1.3 was initially published in 1994 and was followed by Version 2.0 in 1997. Version 3.0 of the COALQUAL...

Palmer, Curtis A.; Oman, Charles L.; Park, Andy J.; Luppens, James A.
Palmer, C.A., Oman, C.L., Park, A.J., and Luppens, J.A., 2015, The U.S. Geological Survey coal quality (COALQUAL) database version 3.0: U.S. Geological Survey Data Series 975, 43 p. with appendixes, http://dx.doi.org/10.3133/ds975.

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Year Published: 2015

Qualitative assessment of selected areas of the world for undiscovered sediment-hosted stratabound copper deposits: Chapter Y in Global mineral resource assessment

A qualitative mineral resource assessment of sediment-hosted stratabound copper mineralized areas for undiscovered copper deposits was performed for 10 selected areas of the world. The areas, in alphabetical order, are (1) Belt-Purcell Basin, United States and Canada; (2) Benguela and Cuanza Basins, Angola; (3) Chuxiong Basin, China; (4) Dongchuan...

Zientek, Michael L.; Hammarstrom, Jane M.; Johnson, Kathleen M.; Zientek, Michael L.; Wintzer, Niki E.; Hayes, Timothy S.; Parks, Heather L.; Briggs, Deborah A.; Causey, J. Douglas; Hatch, Shyla A.; Jenkins, M. Christopher; Williams, David J.
Zientek, M.L., Wintzer, N.E., Hayes, T.S., Parks, H.L., Briggs, D.A., Causey, J.D., Hatch, S.A., Jenkins, M.C., and Williams, D.J., 2015, Qualitative assessment of selected areas of the world for undiscovered sediment-hosted stratabound copper deposits: U.S. Geological Survey Scientific Investigations Report 2010–5090–Y, 143 p., and spatial data, http://dx.doi.org/10.3133/sir20105090Y.

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Year Published: 2015

Geologic Cross Section I–I′ Through the Appalachian Basin from the Eastern Margin of the Illinois Basin, Jefferson County, Kentucky, to the Valley and Ridge Province, Scott County, Virginia

Geologic cross section I‒I’ is the fourth in a series of cross sections constructed by the U.S. Geological Survey to document and improve understanding of the geologic framework and petroleum systems of the Appalachian basin. Cross section I‒I’ provides a regional view of the structural and stratigraphic framework of the Appalachian...

Ryder, Robert T.; Trippi, Michael H.; Swezey, Christopher S.
Ryder, R.T., Trippi, M.H., and Swezey, C.S., 2015, Geologic cross section I–I′ through the Appalachian basin from the eastern margin of the Illinois basin, Jefferson County, Kentucky, to the Valley and Ridge province, Scott County, Virginia: U.S. Geological Survey Scientific Investigations Map 3343, 2 sheets and pamphlet A, 41 p.; pamphlet B, 102 p., http://dx.doi.org/10.3133/sim3343.

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Year Published: 2015

Assessment of undiscovered sandstone-hosted uranium resources in the Texas Coastal Plain, 2015

The U.S. Geological Survey estimated a mean of 220 million pounds of recoverable uranium oxide (U3O8 ) remaining as potential undiscovered resources in southern Texas. This estimate used a geology-based assessment method for Tertiary sandstone-hosted uranium deposits in the Texas Coastal Plain sedimentary strata (fig.1).

Mihalasky, Mark J.; Hall, Susan M.; Hammarstrom, Jane M.; Tureck, Kathleen R.; Hannon, Mark T.; Breit, George N.; Zielinski, Robert A.; Elliott, Brent
U.S. Geological Survey Assessment Team, 2015, Assessment of undiscovered sandstone-hosted uranium resources in the Texas Coastal Plain, 2015: U.S. Geological Survey Fact Sheet 2015–3069, 4 p., http://dx.doi.org/10.3133/fs20153069.

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Year Published: 2015

A practical guide to the use of major elements, trace elements, and isotopes in compositional data analysis: Applications for deep formation brine geochemistry

In the geosciences, isotopic ratios and trace element concentrations are often used along with major element concentrations to help determine sources of and processes affecting geochemical variation. Compositional Data Analysis (CoDA) is a set of tools, generally attuned to major element data, concerned with the proper statistical treatment and...

Blondes, Madalyn S.; Engle, Mark A.; Geboy, Nicholas

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Year Published: 2015

Unconventional energy resources: 2015 review. Shale gas and liquids

Introduction As the source rocks from which petroleum is generated, organic-rich shales have always been considered an important component of petroleum systems. Over the last few years, it has been realized that in some mudrocks, sufficient hydrocarbons remain in place to allow for commercial development, although advanced drilling and...

Fishman, Neil S.; Bowker, Kent; Cander, Harris; Cardott, Brian; Charette, Marc; Chew, Kenneth; Chidsey, Thomas; Dubiel, Russell F.; Egenhoff, Sven O.; Enomoto, Catherine B.; Hammes, Ursula; Harrison, William; Jiang, Shu; LeFever, Julie A.; McCracken, Jock; Nordeng, Stephen; Nyahay, Richard; Sonnenberg, Stephen; Vanden Berg, Michael

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Year Published: 2015

Persistent U(IV) and U(VI) following in-situ recovery (ISR) mining of a sandstone uranium deposit, Wyoming, USA

Drill-core samples from a sandstone-hosted uranium (U) deposit in Wyoming were characterized to determine the abundance and distribution of uranium following in-situ recovery (ISR) mining with oxygen- and carbon dioxide-enriched water. Concentrations of uranium, collected from ten depth intervals, ranged from 5 to 1920 ppm. A composite...

Gallegos, Tanya J.; Campbell, Kate M.; Zielinski, Robert A.; Reimus, P.W.; J.T. Clay; N. Janot; J. J. Bargar; Benzel, William M.