 | | Journal (article/letter/editorial) | | ofPorphyry Copper Deposits in North Sulawesi,Indonesia CSARRY Cs.LOWDER ANDJOHNA. S. Dow Abstract Newlydiscovered...highestcoppergradesare generallyaccompanied by sericitealbite or sericite-montmorillonite alteration, but biotite, chlorite...representsa changefrom advancedargillic to clay-sericite alteration with depth, but ore-grade hypogenecopper...synthesisof the north arm of Sulawesi (Celebes) in Indonesia featuresof explorationand petrologicinterest....Districts streamswas undertakenat a 1:500 scaleand prospect or district compilationswere made at scalesof |  | | Report (issue) | | Characterized by some or all of the minerals kaolinite, sericite, pyrophyllite, and rutile, and locally abundant...Characterized by some or all of the minerals kaolinite, sericite, andalusite, pyrophyllite, topaz, rutile, and...of these deposits include abundant kaolinite, sericite, and pyrophyllite, and traces of rutile, about...the products of hydrothermal alterationof-quartz—sericite schist by fluorine—rich solutions. Espenshade...Tombuililato copper districts, North Sulawesi, Indonesia, and the El Salvador deposit, Chile. The porphyry |  | | Report (volume) | | Characterized by some or all of the minerals kaolinite, sericite, pyrophyllite, and rutile, and locally abundant...Characterized by some or all of the minerals kaolinite, sericite, andalusite, pyrophyllite, topaz, rutile, and...of these deposits include abundant kaolinite, sericite, and pyrophyllite, and traces of rutile, about...products of hydrothermal alteration of quartz-sericite schist by flourine-rich ~ :I: 8:I: > t'"'...leached cap rocks. Analyses of limonite gossan from prospect pit; also contains 91 ppm Ph and 110 ppm Zn. 4 |
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