Abstract
We provide here information on the distribution of copper, zinc, lead, gold, silver, barium, arsenic, antimony, mercury, selenium and tellurium in the Moore and Monte Negro high-sulfidation epithermal deposits in the Pueblo Viejo district, Dominican Republic. Moore and Monte Negro are funnel-shaped zones of advanced argillic alteration and precious-metal mineralization which extend to depths of about 350 m below the present surface. The uppermost part of the Moore deposit has been removed by erosion, whereas the Monte Negro deposit is covered by rocks containing low, but still anomalous gold grades. At Moore, concentrations of all elements except copper increase upward through the deposit. At Monte Negro, all elements except barium and zinc show a similar upward increase in concentration to a point near the top of the deposit from which they decrease upward. This difference reflects the fact that the top of the Moore deposit has been removed by erosion. Because the deposits are funnel-shaped and average metal concentrations increase by almost an order of magnitude upward, most of the metals are concentrated in the upper parts of the deposits. The upward increase in concentration of most metals is gradual and similar in magnitude to the prograde temperature dependence in solubilities of many metal complexes, suggesting that the metals were deposited by cooling. By contrast, concentrations of mercury and, to a lesser extent, tellurium increase more abruptly in the upper part of the deposits. This change probably reflects boiling of the hydrothermal solutions and partitioning of mercury and tellurium into a rising vapor phase, and it suggests that host rocks overlying the deposits will be anomalous in mercury and tellurium. Comparison to the Broadlands, New Zealand, hydrothermal system supports these inferred depositional processes. It shows that the behavior of arsenic and antimony at Broadlands was different from that at Pueblo Viejo, possibly because the elements were complexed differently in the two ore fluids. Comparison of trace-element abundances at Pueblo Viejo to other high-sulfidation epithermal systems shows differences in base-metal, arsenic and mercury abundances which may be related to the depths at which the deposits formed. The results of this study highlight the application and need for quantitative trace-element data from epithermal deposits.
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Acknowledgements
We are grateful to Rosario Dominicana and particularly Michael Seaward, who was manager of the operation, for the opportunity to work at Pueblo Viejo and for funding this research. David Cooke, Jeff Hedenquist and Noel White provided insightful and helpful reviews of an earlier version of this manuscript.
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Kesler, S.E., Russell, N. & McCurdy, K. Trace-metal content of the Pueblo Viejo precious-metal deposits and their relation to other high-sulfidation epithermal systems. Miner Deposita 38, 668–682 (2003). https://doi.org/10.1007/s00126-003-0356-1
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DOI: https://doi.org/10.1007/s00126-003-0356-1