Gold in the Jinya Carlin-type Deposit: Characterization and Implications
- 1 SGS Lakefield Research, P.O. Box 4300, 185 Concession Street, Lakefield, ON K0L 2H0, Canada
- 2 Department of Earth & Space Sciences, University of Science & Technology of China, Hefei 230026, China
Abstract
Gold in the Jinya Carlin-type deposit, assaying 6.27 g/t Au, was characterized using a comprehensive mineralogical and analytical approach which includes optical microscopy and several advanced microbeam techniques. Each gold carrier was quantified independently. Gold in the Jinya ore occurred as microscopic gold and submicroscopic gold. Submicroscopic gold, primarily in the form of solid solution gold, was carried mainly by arsenopyrite (accounting for 77% of the gold assay), and to a lesser extent (~16%) in arsenic-rich fine-grained and microcrystalline pyrite. Native gold accounted for 6% of the gold assay. Gold carried in cinnabar and rock minerals is insignificant. Gold deportment shows that (1) arsenopyritization and pyritization can be used as indication of mineralization for the further exploration in the Jinya district, and (2) gold in sulfides is not amenable to direct cyanidation, but can be recovered by flotation of a sulfide concentrate and then cyanidation with a pretreatment process.
- Arehart, G.B., Chryssoulis, S.L., and Kesler, S.E. (1993): Gold and arsenic in iron sulfides from sediment-hosted micron gold deposits: Implications for depositional processes. Econ. Geol., Vol. 88, 171-185.
- Bakken, B.M., Hochella, M.F., Jr., Marshall, A.F. & Turner, A.M. (1989): High-resolution microscopy of gold in unoxidized ore from the Carlin mine, Nevada. Econ. Geol. Vol. 84, 171-179.
- Bakken, B.M., Fleming, R.H., and Hochella, M.F., Jr. (1991): High-resolution microscopy of auriferous pyrite from the Post deposit, Carlin district, Nevada. In: Process Mineralogy XICharacterization of metallurgical and recycable products, Hausen, D.M., Petruk, W., Hagni, R.D., and Vassiliou, A., eds., Washington, D.C., TMS, p. 13-23.
- Boyle, R.W. (1979): The geochemistry of gold and its deposits. Geol. Survey of Canada, Bull. 280.
- Cabri, L.J., Chryssoulis, S.L., DE Villiers, J. P.R., Laflamme, J.H.G., and Buseck, R. (1989): The nature of “invisible” gold in arsenopyrite. Can. Mineral., Vol. 27, 353-362.
- Chryssoulis, S.L., Cabri, L.J., and Salter, R.S. (1987): Direct determination of invisible gold in refractory sulfide ores. International Symposium on Gold Metallurgy – Refractory Gold, Toronto, Ontario, February 1987, Proceedings, 235-244.
- Chryssoulis, S.L., Cabri, L.J., and Lennard, W. (1989): Calibration of the ion microprobe for quantitative trace precious metal analyses of ore minerals. Econ. Geol., Vol. 84, 1684-1689.
- Chryssoulis, S.L. and Cabri, L.J. (1990): Significance of gold mineralogical balance in mineral processing. Trans. Instn. Min. Metall., Sec. C: Mineral Process. Extr. Metall. 99, T.T., C1-C10.
- Cook, N.J. and Chryssoulis, S.L. (1990): Concentrations of “invisible gold” in the common sulfides. Can. Minerl. Vol. 28, 1-16.
- Hausen, D.M. (1981): Process mineralogy of auriferous pyritic ores at Carlin, Nevada. In Hausen, D.M., and Park, W.C., eds., Process Mineralogy, TMS, Warrendale, PA, 271-289.
- Hausen, D.M., Ahlrichs, J.W., Mueller, W., and Park, W.C. (1986): Particulate gold occurrences in three Carlin carbonaceous ores. In Process Mineralogy VI, ed. D. Hagni, TMS, Warrendale, PA, 193-214.
- Healy, R.E. and Petruk, W. (1990): Petrology of Au-Ag-Hg alloy and ‘invisible gold’ in the Trout Lake massive sulfide deposit, Flin Flon, Manitoba. Can. Mineral., Vol. 28, 2, 189-206.
- Hofstra, A.H., and Cline, J.S. (2000): Characteristics and models for Carlin-type gold deposits. Reviews in Economic Geology, Vol. 13, p. 163-220.