Craig A Johnson, Ph.D.
Craig Johnson is a Research Geologist with the Geology, Geophysics, and Geochemistry Science Center.
Craig attended Dartmouth (AB), Michigan (MS), and Yale (PhD). He held a NASA postdoc and a staff position at the American Museum of Natural History in New York prior to joining the USGS in 1992. Craig is responsible for a stable isotope laboratory in which isotopes of carbon, hydrogen, nitrogen, oxygen, and sulfur are measured in rocks, waters, gases, and biological materials. Craig studies ore genesis, environmental impacts of mining, the source and fate of solutes in natural waters and crustal fluids, the isotopic record of marine sulfate, and isotopic records of paleoenvironments.
Science and Products
Predicting mountain lion activity using radiocollars equipped with mercury tip-sensors
Accounting for cyanide and its degradation products at three Nevada gold mines; constraints from stable C- and N-isotopes
The use of stable carbon- and nitrogen-isotope data in quantifying cyanide loss from nine wastewaters
Movement and diffusion of pore fluids in Owens Lake sediments from core OL-92 as shown by salinity and deuterium-hydrogen ratios
Sulfur isotope analyses using the laser microprobe
Natural or fertilizer-derived uranium in irrigation drainage: A case study in southeastern Colorado, U.S.A.
Proterozoic low-Ti iron-oxide deposits in New York and New Jersey: Relation to Fe-oxide (Cu–U–Au–rare earth element) deposits and tectonic implications: Comment and Reply
Cierco Pb-Zn-Ag vein deposits: Isotopic and fluid inclusion evidence for formation during the mesozoic extension in the pyrenees of Spain
Determination of 15N/14N and 13C/12C in solid and aqueous cyanides
Nitrogen isotopes in nitrate from surface water and shallow groundwater at Sixmile Creek, southeastern Colorado
Methods for analysis of 15N/14N and 13C/12C in solid and aqueous cyanides; an interim report
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Science and Products
Predicting mountain lion activity using radiocollars equipped with mercury tip-sensors
Accounting for cyanide and its degradation products at three Nevada gold mines; constraints from stable C- and N-isotopes
The use of stable carbon- and nitrogen-isotope data in quantifying cyanide loss from nine wastewaters
Movement and diffusion of pore fluids in Owens Lake sediments from core OL-92 as shown by salinity and deuterium-hydrogen ratios
Sulfur isotope analyses using the laser microprobe
Natural or fertilizer-derived uranium in irrigation drainage: A case study in southeastern Colorado, U.S.A.
Proterozoic low-Ti iron-oxide deposits in New York and New Jersey: Relation to Fe-oxide (Cu–U–Au–rare earth element) deposits and tectonic implications: Comment and Reply
Cierco Pb-Zn-Ag vein deposits: Isotopic and fluid inclusion evidence for formation during the mesozoic extension in the pyrenees of Spain
Determination of 15N/14N and 13C/12C in solid and aqueous cyanides
Nitrogen isotopes in nitrate from surface water and shallow groundwater at Sixmile Creek, southeastern Colorado
Methods for analysis of 15N/14N and 13C/12C in solid and aqueous cyanides; an interim report
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.