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Dublin Gulch, Eagle Zone |
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Yukon Territory, Canada |
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Au
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Super Porphyry Cu and Au
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IOCG Deposits - 70 papers
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The Dublin Gulch gold deposits, including the Eagle Zone, are hosted by the Dublin Gulch intrusion, a member of the Tombstone plutonic suite, represented by a linear belt of middle Cretaceous intrusions that extend across the Yukon Territory. See also the Tintina & the Tombstone Gold Province.
As with many of the intrusions in the Tombstone suite, the Dublin Gulch intrusion contains several different zones of gold and tungsten mineralization, within and immediately adjacent to the intrusion.
The Eagle zone which occurs in the southwestern section of the Dublin Gulch intrusion, is the most significant gold concentration in the intrusive. Gold occurs in a broadly east-west striking, steeply south-dipping series of sheeted veins, comprising early quartz-scheelite-pyrrhotite-pyrite-arsenopyrite, with associated K-feldspar-albite alteration envelopes. These in turn grade out to and are overprinted by sericite-carbonate-chlorite alteration. The same assemblage is also found in veinlets that refracture the sheeted quartz veins and contain the majority of the gold. The gold occurs with molybdenite, lead-bismuth-antimony sulphosalts, galena, and bismuthinite.
Gold has a strong correlation with bismuth, but a poor correlation with all other elements. Tungsten and molybdenum which have a weak inter-relationship are earlier than the majority of the gold, while lead, zinc, copper, silver, antimony and arsenic have moderate to strong inter-element correlations.
The Eagle Zone at Dublin Gulch has resources of 50.3 Mt @ 0.93 g/t gold.
The most recent source geological information used to prepare this decription was dated: 2001.
This description is a summary from published sources, the chief of which are listed below.
© Copyright Porter GeoConsultancy Pty Ltd. Unauthorised copying, reproduction, storage or dissemination prohibited.
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Selected References:
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Baker, T., Ebert, S., Rombach, C. and Ryan, C.G., 2006 - Chemical Compositions of Fluid Inclusions in Intrusion-Related Gold Systems, Alaska and Yukon, Using PIXE Microanalysis: in Econ. Geol. v.101, pp. 311-327.
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Maloof T L, Baker T and Thompson J F 2001 - The Dublin Gulch intrusion-hosted gold deposit, Tombstone plutonic suite, Yukon Territory, Canada: in Mineralium Deposita v36 pp583-593
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Selby D, Creaser R A, Heaman L M, Hart C J R 2003 - Re-Os and U-Pb geochronology of the Clear Creek, Dublin Gulch, and Mactung deposits, Tombstone Gold Belt, Yukon, Canada: absolute timing relationships between plutonism and mineralization: in Can. J. Earth Sci. v40 pp 1839-1852
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Porter GeoConsultancy Pty Ltd (PorterGeo) provides access to this database at no charge. It is largely based on scientific papers and reports in the public domain, and was current when the sources consulted were published. While PorterGeo endeavour to ensure the information was accurate at the time of compilation and subsequent updating, PorterGeo, its employees and servants: i). do not warrant, or make any representation regarding the use, or results of the use of the information contained herein as to its correctness, accuracy, currency, or otherwise; and ii). expressly disclaim all liability or responsibility to any person using the information or conclusions contained herein.
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