Klaus J. Schulz (Former Employee)
Science and Products
Filter Total Items: 49
Occurrence model for magmatic sulfide-rich nickel-copper-(platinum-group element) deposits related to mafic and ultramafic dike-sill complexes Occurrence model for magmatic sulfide-rich nickel-copper-(platinum-group element) deposits related to mafic and ultramafic dike-sill complexes
Magmatic sulfide deposits containing nickel (Ni) and copper (Cu), with or without (±) platinum-group elements (PGE), account for approximately 60 percent of the world’s nickel production. Most of the remainder of the Ni production is derived from lateritic deposits, which form by weathering of ultramafic rocks in humid tropical conditions. Magmatic Ni-Cu±PGE sulfide deposits are...
Authors
Klaus J. Schulz, Laurel G. Woodruff, Suzanne W. Nicholson, Robert R. Seal, Nadine M. Piatak, Val W. Chandler, John L. Mars
Niobium and tantalum: indispensable twins Niobium and tantalum: indispensable twins
Niobium and tantalum are transition metals almost always paired together in nature. These “twins” are difficult to separate because of their shared physical and chemical properties. In 1801, English chemist Charles Hatchett uncovered an unknown element in a mineral sample of columbite; John Winthrop found the sample in a Massachusetts mine and sent it to the British Museum in London in...
Authors
Klaus Schulz, John Papp
Descriptive and geoenvironmental model for Co-Cu-Au deposits in metasedimentary rocks Descriptive and geoenvironmental model for Co-Cu-Au deposits in metasedimentary rocks
Introduction This report is a revised model for a specific type of cobalt-copper-gold (Co-Cu-Au) deposit that will be evaluated in the next U.S. Geological Survey (USGS) assessment of undiscovered mineral resources in the United States (see Ferrero and others, 2012). Emphasis is on providing an up-to-date deposit model that includes both geologic and geoenvironmental aspects. The new...
Authors
John F. Slack, Craig A. Johnson, J. Douglas Causey, Karen Lund, Klaus J. Schulz, John E. Gray, Robert G. Eppinger
Volcanogenic massive sulfide occurrence model Volcanogenic massive sulfide occurrence model
Volcanogenic massive sulfide deposits, also known as volcanic-hosted massive sulfide, volcanic-associated massive sulfide, or seafloor massive sulfide deposits, are important sources of copper, zinc, lead, gold, and silver (Cu, Zn, Pb, Au, and Ag). These deposits form at or near the seafloor where circulating hydrothermal fluids driven by magmatic heat are quenched through mixing with...
Authors
W.C. Pat Shanks, Randolph A. Koski, Dan L. Mosier, Klaus J. Schulz, Lisa A. Morgan, John F. Slack, W. Ian Ridley, Cynthia Dusel-Bacon, Robert R. Seal, Nadine M. Piatak
A major light rare-earth element (LREE) resource in the Khanneshin carbonatite complex, southern Afghanistan A major light rare-earth element (LREE) resource in the Khanneshin carbonatite complex, southern Afghanistan
The rapid rise in world demand for the rare-earth elements (REEs) has expanded the search for new REE resources. We document two types of light rare-earth element (LREE)-enriched rocks in the Khanneshin carbonatite complex of southern Afghanistan: type 1 concordant seams of khanneshite-(Ce), synchysite-(Ce), and parisite-(Ce) within banded barite-strontianite alvikite, and type 2 igneous...
Authors
Robert D. Tucker, Harvey E. Belkin, Klaus J. Schulz, Stephen G. Peters, Forrest Horton, Kim Buttleman, Emily R. Scott
Rare earth element mineralogy, geochemistry, and preliminary resource assessment of the Khanneshin carbonatite complex, Helmand Province, Afghanistan Rare earth element mineralogy, geochemistry, and preliminary resource assessment of the Khanneshin carbonatite complex, Helmand Province, Afghanistan
This product is temporarily unavailable.
Authors
Robert D. Tucker, Harvey E. Belkin, Klaus J. Schulz, Stephen G. Peters, Kim P. Buttleman
Science and Products
Filter Total Items: 49
Occurrence model for magmatic sulfide-rich nickel-copper-(platinum-group element) deposits related to mafic and ultramafic dike-sill complexes Occurrence model for magmatic sulfide-rich nickel-copper-(platinum-group element) deposits related to mafic and ultramafic dike-sill complexes
Magmatic sulfide deposits containing nickel (Ni) and copper (Cu), with or without (±) platinum-group elements (PGE), account for approximately 60 percent of the world’s nickel production. Most of the remainder of the Ni production is derived from lateritic deposits, which form by weathering of ultramafic rocks in humid tropical conditions. Magmatic Ni-Cu±PGE sulfide deposits are...
Authors
Klaus J. Schulz, Laurel G. Woodruff, Suzanne W. Nicholson, Robert R. Seal, Nadine M. Piatak, Val W. Chandler, John L. Mars
Niobium and tantalum: indispensable twins Niobium and tantalum: indispensable twins
Niobium and tantalum are transition metals almost always paired together in nature. These “twins” are difficult to separate because of their shared physical and chemical properties. In 1801, English chemist Charles Hatchett uncovered an unknown element in a mineral sample of columbite; John Winthrop found the sample in a Massachusetts mine and sent it to the British Museum in London in...
Authors
Klaus Schulz, John Papp
Descriptive and geoenvironmental model for Co-Cu-Au deposits in metasedimentary rocks Descriptive and geoenvironmental model for Co-Cu-Au deposits in metasedimentary rocks
Introduction This report is a revised model for a specific type of cobalt-copper-gold (Co-Cu-Au) deposit that will be evaluated in the next U.S. Geological Survey (USGS) assessment of undiscovered mineral resources in the United States (see Ferrero and others, 2012). Emphasis is on providing an up-to-date deposit model that includes both geologic and geoenvironmental aspects. The new...
Authors
John F. Slack, Craig A. Johnson, J. Douglas Causey, Karen Lund, Klaus J. Schulz, John E. Gray, Robert G. Eppinger
Volcanogenic massive sulfide occurrence model Volcanogenic massive sulfide occurrence model
Volcanogenic massive sulfide deposits, also known as volcanic-hosted massive sulfide, volcanic-associated massive sulfide, or seafloor massive sulfide deposits, are important sources of copper, zinc, lead, gold, and silver (Cu, Zn, Pb, Au, and Ag). These deposits form at or near the seafloor where circulating hydrothermal fluids driven by magmatic heat are quenched through mixing with...
Authors
W.C. Pat Shanks, Randolph A. Koski, Dan L. Mosier, Klaus J. Schulz, Lisa A. Morgan, John F. Slack, W. Ian Ridley, Cynthia Dusel-Bacon, Robert R. Seal, Nadine M. Piatak
A major light rare-earth element (LREE) resource in the Khanneshin carbonatite complex, southern Afghanistan A major light rare-earth element (LREE) resource in the Khanneshin carbonatite complex, southern Afghanistan
The rapid rise in world demand for the rare-earth elements (REEs) has expanded the search for new REE resources. We document two types of light rare-earth element (LREE)-enriched rocks in the Khanneshin carbonatite complex of southern Afghanistan: type 1 concordant seams of khanneshite-(Ce), synchysite-(Ce), and parisite-(Ce) within banded barite-strontianite alvikite, and type 2 igneous...
Authors
Robert D. Tucker, Harvey E. Belkin, Klaus J. Schulz, Stephen G. Peters, Forrest Horton, Kim Buttleman, Emily R. Scott
Rare earth element mineralogy, geochemistry, and preliminary resource assessment of the Khanneshin carbonatite complex, Helmand Province, Afghanistan Rare earth element mineralogy, geochemistry, and preliminary resource assessment of the Khanneshin carbonatite complex, Helmand Province, Afghanistan
This product is temporarily unavailable.
Authors
Robert D. Tucker, Harvey E. Belkin, Klaus J. Schulz, Stephen G. Peters, Kim P. Buttleman