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Hollister, V.F., Entwistle, L.P. (1977) The Milluachaqui epithermal silver district of northern Peru. Mineralium Deposita, 12 (2). 235-238 doi:10.1007/bf00206029

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Reference TypeJournal (article/letter/editorial)
TitleThe Milluachaqui epithermal silver district of northern Peru
JournalMineralium Deposita
AuthorsHollister, V.F.Author
Entwistle, L.P.Author
Year1977 (July)Volume12
Page(s)235-238Issue2
PublisherSpringer Science and Business Media LLC
DOIdoi:10.1007/bf00206029Search in ResearchGate
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Mindat Ref. ID154964Long-form Identifiermindat:1:5:154964:9
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Full ReferenceHollister, V.F., Entwistle, L.P. (1977) The Milluachaqui epithermal silver district of northern Peru. Mineralium Deposita, 12 (2). 235-238 doi:10.1007/bf00206029
Plain TextHollister, V.F., Entwistle, L.P. (1977) The Milluachaqui epithermal silver district of northern Peru. Mineralium Deposita, 12 (2). 235-238 doi:10.1007/bf00206029
In(1977, July) Mineralium Deposita Vol. 12 (2) Springer Science and Business Media LLC
Abstract/NotesThe mines in the Milluachaqui district, located near Salpo in the northern part of Peru, show a vertically zoned, epithermal silver-gold mineralization. Colonial production was obtained from oxidized, high-grade ores, consisting mostly of native silver and cerargyrite. More modern development exposed, from the top of ore shoots to their base, the "bonanza" ores (the pyrargyrite-polybasite-acanthite zone), silver-copper ores (the tetrahedrite zone), silver-lead ores (the galena-sphalerite zone), and the basal zone ores (the sphalerite zone). The ratio of gold to silver in the "bonanza" ores was about 1 to 100, by weight. Interpretation of mineralogical textures and the composition of minerals in the sulfide zone suggests that supergene movement and enrichment of silver at Milluachaqui was not a significant factor. Silver tended to be fixed in place during weathering as the chloride and native mineral. The "bonanza" ores are interpreted to be hypogene sulfide accumulations. These findings contrast to hypotheses proposed for some epithermal districts in the U.S. which assume supergene activity to have been significant in the accumulation of high grade, near-surface silver ores.

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Locality Pages

LocalityCitation Details
Milluaehaqui, Salpo, Otuzco Province, La Libertad, Peru

Mineral Occurrences

LocalityMineral(s)
Milluaehaqui, Salpo, Otuzco Province, La Libertad, Peruβ“˜ Acanthite, β“˜ Andesite, β“˜ Argillaceous Quartzite, β“˜ Arsenopyrite, β“˜ Baryte, β“˜ Breccia, β“˜ Calcite, β“˜ Chalcopyrite, β“˜ Chlorargyrite, β“˜ Chlorite Group, β“˜ Epidote, β“˜ Fluorite, β“˜ Galena, β“˜ Gypsum, β“˜ Marcasite, β“˜ Native Gold, β“˜ Native Silver, β“˜ Polybasite, β“˜ Pyrargyrite, β“˜ Pyrite, β“˜ Quartz, β“˜ Rhodochrosite, β“˜ Shale, β“˜ Sphalerite, β“˜ Tetrahedrite Subgroup

See Also

These are possibly similar items as determined by title/reference text matching only.

Hollister, V.F. (1975) The porphyry molybdenum deposit of Compaccha, Peru, and its geologic setting. Mineralium Deposita, 10 (2) doi:10.1007/bf00206529
Hollister, V.F. (1977) Discussion for the manuscript of J. A. Noble: ?Metallogenic provinces of the Cordillera of Western North and South America? Mineralium Deposita, volume 11, p. 219?233 (1976) Mineralium Deposita, 12 (2) 239-240 doi:10.1007/bf00206030
Hollister, V.F., Baumann, F.W. (1978) The North Fork porphyry copper deposit of the Washington Cascades. Mineralium Deposita, 13 (2) doi:10.1007/bf00204642
Hollister, V.F., Sirvas, E.B. (1974) The Michiquillay porphyry copper deposit. Mineralium Deposita, 9 (3). 261-269 doi:10.1007/bf00204000
Goossens, P.J., Hollister, V.F. (1973) Structural control and hydrothermal alteration pattern of Chaucha Porphyry Copper, Ecuador. Mineralium Deposita, 8 (4) doi:10.1007/bf00207515
Hollister, V.F., and Bauman, F.W. (1978): The North Fork porphyry copper deposit of the Washington Cascades. Mineralium Deposita 13, 191–199.
Lawson, P. Entwistle, Hollister, Victor F. (1957) The geology and ore deposits of the Quiruvilca District, Peru; discussion. Economic Geology, 52 (2) 199-200 doi:10.2113/gsecongeo.52.2.199
Concha, A., Oyarzun, R., Lunar, R., Sierra, J., Doblas, M., Lillo, J. (1992) The Hiendelaencina epithermal silver-base metal district, Central Spain: Tectonic and mineralizing processes. Mineralium Deposita, 27 (2) doi:10.1007/bf00197090
(1977) Announcements. Mineralium Deposita, 12 (2) 243-244 doi:10.1007/bf00206032
(1977) Corrigendum notice. Mineralium Deposita, 12 (2) 245 doi:10.1007/bf00206033
(1977) New address. Mineralium Deposita, 12 (2) 245 doi:10.1007/bf00206034
 
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