Determination of the occurrence of gold in an unoxidized Carlin-type ore sample using synchrotron radiation
The occurrence of the so-called invisible gold in two unoxidized Carlin-type gold samples from Nevada have been determined using synchrotron x-ray fluorescence (SXRF) analysis at the National Sychrotron Light Source, Brookhaven National Laboratory. The samples were a bedded sample from the east ore zone of the Carlin deposit and a breccia sample from Horse Canyon. Preliminary results show that gold is found only in the Horse Canyon breccia sample. Experimental details including other x-ray line and diffraction peak interferences, standards used, and minimum detection limits (MDLs) are discussed. Gold was not detected in euhedral pyrite crystals except in the interior porous portion of one grain with MDLs of 0.8 to 3 ppM. Gold was detected in some parts of the matrix. The phase which contains gold has not yet been identified. The highest content of gold so far analyzed is about 40 ppM. Implications of these new findings are discussed. 2 figs.
- Research Organization:
- State Univ. of New York, Geneseo (USA). Dept. of Physics and Astronomy; Geological Survey, Reston, VA (USA); Geological Survey, Menlo Park, CA (USA); Chicago Univ., IL (USA). Dept. of Geophysical Sciences; Brookhaven National Lab., Upton, NY (USA). Applied Physics Div.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5404161
- Report Number(s):
- BNL-38356; CONF-8606181-3; ON: DE86013911
- Resource Relation:
- Conference: 4. international conference on particle induced X-ray emission and its analytical applications, Tallahassee, FL, USA, 9 Jun 1986
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
GOLD 197
X-RAY FLUORESCENCE ANALYSIS
MINERALOGY
NSLS
SYNCHROTRON RADIATION
TRACE AMOUNTS
X-RAY FLUORESCENCE ANALYZERS
X-RAY SPECTRA
ACCELERATORS
BREMSSTRAHLUNG
CHEMICAL ANALYSIS
CYCLIC ACCELERATORS
ELECTROMAGNETIC RADIATION
GOLD ISOTOPES
HEAVY NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
NONDESTRUCTIVE ANALYSIS
NUCLEI
ODD-EVEN NUCLEI
RADIATION SOURCES
RADIATIONS
RADIOISOTOPES
SECONDS LIVING RADIOISOTOPES
SPECTRA
STABLE ISOTOPES
SYNCHROTRON RADIATION SOURCES
SYNCHROTRONS
X-RAY EMISSION ANALYSIS
400103* - Radiometric & Radiochemical Procedures- (-1987)