| Abstract: | Geologic studies during recent open-pit mining at Summitville, Colorado, have provided new information on an epithermal acid sulfate Au-Ag-Cu deposit formed in a volcanic dome. Geologic mapping, geochemical studies of whole-rock samples from blast holes, and geologic and geochemical traverse studies refine the details of the evolution of the Summitville deposit. Six distinct events followed emplacement of the quartz latite volcanic dome and define the development of the Summitville deposit: 1) an early stage of acid sulfate alteration, 2) subsequent Cu sulfide and gold mineralization, 3) widespread hydrothermal brecciation, 4) volumetrically minor, base metal sulfide-bearing barite veining, 5) volumetrically minor, kaolinite matrix brecciation, and finally, 6) supergene oxidation. -from Authors |
| Genre: | Article |
| ProdID: | 70016742 |
| Citation Author: | Gray, J. E.; Coolbaugh, M. F. |
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| Citation End Page: | 1923 |
| Citation Issue: | 8 |
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| Citation Language: | English |
| Citation Larger Work Title: | Economic Geology |
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| Citation Number Of Pages: | 18 |
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| Citation Search Results Text: | Geology and geochemistry of Summitville, Colorado: an epithermal acid sulfate deposit in a volcanic dome; 1994; Article; Journal; Economic Geology; Gray, J. E.; Coolbaugh, M. F. |
| Citation Start Page: | 1906 |
| Citation Volume: | 89 |
| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | Geology and geochemistry of Summitville, Colorado: an epithermal acid sulfate deposit in a volcanic dome; 1994; Article; Journal; Economic Geology; Gray, J. E.; Coolbaugh, M. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
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