Karen Duttweiler Kelley
Karen Kelley is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.
Science and Products
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USGS exploration geochemistry studies at the Pebble porphyry Cu-Au-Mo deposit, Alaska— Pdf of presentation USGS exploration geochemistry studies at the Pebble porphyry Cu-Au-Mo deposit, Alaska— Pdf of presentation
From 2007 through 2010, scientists in the U.S. Geological Survey (USGS) have been conducting exploration-oriented geochemical and geophysical studies in the region surrounding the giant Pebble porphyry Cu-Au-Mo deposit in southwestern Alaska. The Cretaceous Pebble deposit is concealed under tundra, glacial till, and Tertiary cover rocks, and is undisturbed except for numerous exploration...
Authors
Robert G. Eppinger, Karen D. Kelley, David L. Fey, Stuart A. Giles, Burke J. Minsley, Steven M. Smith
Geochemical data for samples collected in 2008 near the concealed pebble porphyry Cu-Au-Mo deposit, Southwest Alaska Geochemical data for samples collected in 2008 near the concealed pebble porphyry Cu-Au-Mo deposit, Southwest Alaska
In the summer of 2007, the U.S. Geological Survey (USGS) began an exploration geochemical research study over the Pebble porphyry copper-gold-molybdenum deposit. This report presents the analytical data collected in 2008. The Pebble deposit is world class in size, and is almost entirely concealed by tundra, glacial deposits, and post-Cretaceous volcanic rocks. The Pebble deposit was...
Authors
David L. Fey, Matthew Granitto, Stuart A. Giles, Steven M. Smith, Robert G. Eppinger, Karen D. Kelley
An orientation soil survey at the Pebble Cu-Au-Mo porphyry deposit, Alaska An orientation soil survey at the Pebble Cu-Au-Mo porphyry deposit, Alaska
Soil samples were collected in 2007 and 2008 along three traverses across the giant Pebble Cu-Au-Mo porphyry deposit. Within each soil pit, four subsamples were collected following recommended protocols for each of ten commonly-used and proprietary leach/digestion techniques. The significance of geochemical patterns generated by these techniques was classified by visual inspection of...
Authors
Steven M. Smith, Robert G. Eppinger, David L. Fey, Karen D. Kelley, S. A. Giles
The Drenchwater deposit, Alaska: An example of a natural low pH environment resulting from weathering of an undisturbed shale-hosted Zn-Pb-Ag deposit The Drenchwater deposit, Alaska: An example of a natural low pH environment resulting from weathering of an undisturbed shale-hosted Zn-Pb-Ag deposit
The Drenchwater shale-hosted Zn-Pb-Ag deposit and the immediate vicinity, on the northern flank of the Brooks Range in north-central Alaska, is an ideal example of a naturally low pH system. The two drainages, Drenchwater and False Wager Creeks, which bound the deposit, differ in their acidity and metal contents. Moderately acidic waters with elevated concentrations of metals (pH ??? 4.3...
Authors
G.E. Graham, K.D. Kelley
Scientific communications: Re-Os sulfide (bornite, chalcopyrite, and pyrite) systematics of the carbonate-hosted copper deposits at ruby creek, southern brooks range, Alaska Scientific communications: Re-Os sulfide (bornite, chalcopyrite, and pyrite) systematics of the carbonate-hosted copper deposits at ruby creek, southern brooks range, Alaska
New Re-Os data for chalcopyrite, bornite, and pyrite from the carbonate-hosted Cu deposit at Ruby Creek (Bornite), Alaska, show extremely high Re abundances (hundreds of ppb, low ppm) and contain essentially no common Os. The Re-Os data provide the first absolute ages of ore formation for the carbonate-hosted Ruby Creek Cu-(Co) deposit and demonstrate that the Re-Os systematics of pyrite
Authors
D. Selby, K.D. Kelley, M.W. Hitzman, J. Zieg
Zinc isotopes in sphalerite from base metal deposits in the Red Dog district, northern Alaska Zinc isotopes in sphalerite from base metal deposits in the Red Dog district, northern Alaska
Analyses of sphalerite samples from shale-hosted massive sulfide and stratigraphically underlying vein breccia deposits in the Red Dog district in northern Alaska show a range ??66Zn values from zero to 0.60 per mil. The lowest values are observed in the vein breccia deposits, and the stratigraphically overlying (but structurally displaced) shale-hosted massive sulfide deposits show a...
Authors
K.D. Kelley, J.J. Wilkinson, J.B. Chapman, H.L. Crowther, D.J. Weiss
Science and Products
Filter Total Items: 14
No Result Found
Filter Total Items: 85
USGS exploration geochemistry studies at the Pebble porphyry Cu-Au-Mo deposit, Alaska— Pdf of presentation USGS exploration geochemistry studies at the Pebble porphyry Cu-Au-Mo deposit, Alaska— Pdf of presentation
From 2007 through 2010, scientists in the U.S. Geological Survey (USGS) have been conducting exploration-oriented geochemical and geophysical studies in the region surrounding the giant Pebble porphyry Cu-Au-Mo deposit in southwestern Alaska. The Cretaceous Pebble deposit is concealed under tundra, glacial till, and Tertiary cover rocks, and is undisturbed except for numerous exploration...
Authors
Robert G. Eppinger, Karen D. Kelley, David L. Fey, Stuart A. Giles, Burke J. Minsley, Steven M. Smith
Geochemical data for samples collected in 2008 near the concealed pebble porphyry Cu-Au-Mo deposit, Southwest Alaska Geochemical data for samples collected in 2008 near the concealed pebble porphyry Cu-Au-Mo deposit, Southwest Alaska
In the summer of 2007, the U.S. Geological Survey (USGS) began an exploration geochemical research study over the Pebble porphyry copper-gold-molybdenum deposit. This report presents the analytical data collected in 2008. The Pebble deposit is world class in size, and is almost entirely concealed by tundra, glacial deposits, and post-Cretaceous volcanic rocks. The Pebble deposit was...
Authors
David L. Fey, Matthew Granitto, Stuart A. Giles, Steven M. Smith, Robert G. Eppinger, Karen D. Kelley
An orientation soil survey at the Pebble Cu-Au-Mo porphyry deposit, Alaska An orientation soil survey at the Pebble Cu-Au-Mo porphyry deposit, Alaska
Soil samples were collected in 2007 and 2008 along three traverses across the giant Pebble Cu-Au-Mo porphyry deposit. Within each soil pit, four subsamples were collected following recommended protocols for each of ten commonly-used and proprietary leach/digestion techniques. The significance of geochemical patterns generated by these techniques was classified by visual inspection of...
Authors
Steven M. Smith, Robert G. Eppinger, David L. Fey, Karen D. Kelley, S. A. Giles
The Drenchwater deposit, Alaska: An example of a natural low pH environment resulting from weathering of an undisturbed shale-hosted Zn-Pb-Ag deposit The Drenchwater deposit, Alaska: An example of a natural low pH environment resulting from weathering of an undisturbed shale-hosted Zn-Pb-Ag deposit
The Drenchwater shale-hosted Zn-Pb-Ag deposit and the immediate vicinity, on the northern flank of the Brooks Range in north-central Alaska, is an ideal example of a naturally low pH system. The two drainages, Drenchwater and False Wager Creeks, which bound the deposit, differ in their acidity and metal contents. Moderately acidic waters with elevated concentrations of metals (pH ??? 4.3...
Authors
G.E. Graham, K.D. Kelley
Scientific communications: Re-Os sulfide (bornite, chalcopyrite, and pyrite) systematics of the carbonate-hosted copper deposits at ruby creek, southern brooks range, Alaska Scientific communications: Re-Os sulfide (bornite, chalcopyrite, and pyrite) systematics of the carbonate-hosted copper deposits at ruby creek, southern brooks range, Alaska
New Re-Os data for chalcopyrite, bornite, and pyrite from the carbonate-hosted Cu deposit at Ruby Creek (Bornite), Alaska, show extremely high Re abundances (hundreds of ppb, low ppm) and contain essentially no common Os. The Re-Os data provide the first absolute ages of ore formation for the carbonate-hosted Ruby Creek Cu-(Co) deposit and demonstrate that the Re-Os systematics of pyrite
Authors
D. Selby, K.D. Kelley, M.W. Hitzman, J. Zieg
Zinc isotopes in sphalerite from base metal deposits in the Red Dog district, northern Alaska Zinc isotopes in sphalerite from base metal deposits in the Red Dog district, northern Alaska
Analyses of sphalerite samples from shale-hosted massive sulfide and stratigraphically underlying vein breccia deposits in the Red Dog district in northern Alaska show a range ??66Zn values from zero to 0.60 per mil. The lowest values are observed in the vein breccia deposits, and the stratigraphically overlying (but structurally displaced) shale-hosted massive sulfide deposits show a...
Authors
K.D. Kelley, J.J. Wilkinson, J.B. Chapman, H.L. Crowther, D.J. Weiss