Determination of the occurrence of gold in an unoxidized Carlin-type ore sample using synchrotron radiation

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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 ... continued below

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Pages: 12

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Chen, J.R.; Chao, E.C.T.; Minkin, J.A.; Back, J.M.; Bagby, W.C.; Rivers, M.L. et al. January 1, 1986.

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Description

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.

Physical Description

Pages: 12

Notes

NTIS, PC A02/MF A01.

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  • 4. international conference on particle induced X-ray emission and its analytical applications, Tallahassee, FL, USA, 9 Jun 1986

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  • Other: DE86013911
  • Report No.: BNL-38356
  • Report No.: CONF-8606181-3
  • Grant Number: AC02-76CH00016
  • Office of Scientific & Technical Information Report Number: 5404161
  • Archival Resource Key: ark:/67531/metadc1064315

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  • January 1, 1986

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  • Feb. 4, 2018, 10:51 a.m.

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  • March 28, 2018, 12:56 p.m.

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Chen, J.R.; Chao, E.C.T.; Minkin, J.A.; Back, J.M.; Bagby, W.C.; Rivers, M.L. et al. Determination of the occurrence of gold in an unoxidized Carlin-type ore sample using synchrotron radiation, article, January 1, 1986; United States. (digital.library.unt.edu/ark:/67531/metadc1064315/: accessed July 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.