ESM Table 5. Description of Río Blanco samples.
Sample / Rock type mineral /Description
DDH 803A828.4 m / BXMGD
biotite cement / Magmatic breccia with Río Blanco granodiorite fragments; fine grained cement of potassic feldspar and biotite (< 100 mm) with biotite locally chloritized; phenocristales of potassic feldspar, biotite (500 mm), plagioclase and quartz; potassic feldspar with sericitization; chloritized biotite; quartz-anhydrite vein.
DDH 803A
470 m / BXMGD
feldspar cement / Magmatic breccia with Cascada granodiorite fragments; agglomeration of secondary biotite, anhydrite; feldspar flooding with fine-grained feldspar; quartz-bornite vein cuts quartz-gypsum-feldspar vein; disseminated bornite; potassic alteration.
DDH 173
30 m / GDRB
hornblende / Río Blanco granodiorite realitvely fresh looking; some biotite (< 400 mm) replacing amphiboles (300-500 mm; potassic feldspar and plagioclase show some sericitization; zircon (< 100 mm).
Segment
CP-63 / PQM
zircon / Quartz-Monzonite porphyry; magmatic biotite replaced by secondary biotite or chlorite; sericitization of potassic feldspar phenocrysts not affecting the cement.
DDH-786
940 m / PQM
molybdenite / Quartz monzonite porphyry; plagioclase, muscovite, quartz, potassic feldspar in cement of quartz and alteration minerals as sericite and calcite; disseminated molybdenite in cement; sericitization.
Loop Chancador / PDL
zircon / Don Luís porphyry; magmatic and secondary biotite with calcite; fine quartz vein; some anhydrite replacing potassic feldspar.
DDH-786
889.7-903 m / PQM
zircon / Quartz monzonite porphyry; phenocrystals of potassic feldspar (sericitized); quartz, potassic feldspar and primary biotite reemplaced by secondary biotite in quartz-feldspar-anhydrite cement; quartz-potassic feldspar-anhydrite vein; chloritized biotite or with ankerite.
DDH-459
236-238 m / CHRIOL
zircon / Rhyolith Plug with fluidal texture; containing mineral fragments of plagioclase and quartz; secondary? biotite; clasts with alteration minerals of ankerite, sericite (1 mm o 300 mm, glass/semctite?; argillic alteration.
Segment XC-155 level 16 1/2 / CHDAC
sericite / Dacite Plug; strongly seritized; quartz, potassic feldspar, sericite, pyrophylite, plagioclase; some apatite.
DDH-806
514-520 m / PQM
zircon / Quartz monzonite porphyry; phenocrystals of totally sericitized potassic feldspar; quartz-pyrite-chalcopyrite-anhydrite vein; biotite reemplaced by muscovite; disseminated pyrite and chalcopyrite.
DDH786
933 m / BXMGD
biotite cement / Magmatic breccia with Río Blanco granodiorite fragments; quartz-chalcopyrite vein; quartz vein; disseminated pyrite in rock specimen.
DDH785
278 M / BXMGD
biotite cement feldspar aplite / Magmatic breccia with Río Blanco granodiorite fragments; cement with quartz-potassic feldspar-sericite-caolinite, fine biotite and magnetite agglomerates; potassic feldspar vein; contact with potassic feldspar aplite.
DDH785
517 M / BXMGD
feldspar vein / Magmatic breccia with Río Blanco granodiorite fragments; fine grained biotite cement cut by potassic feldspar vein.
DDH766
148-149 M / PQM
quartz-feldspar, quartz sericite veins / Quartz-monzonite porphyry with quartz-potassic feldspar and quartz-sericite veins with scarce molybdenite and anhydrite.
GDRB: Río Blanco granodiorite; PQM: Quartz Monzonite porphyry; PDL, Don Luis porphyry; porphyry, CHDAC: Dacite plug; CHRIOL: Rhyolithe plug; BXMGD: magmatic breccias in granodiorite.