The mineralization is related to intensive silicification (local quartz veining) and sericitization
, carbonation and weak sulphidation.
Alteration in the area is composed of silicification, pyritization, sericitization
, alunite and pyrophyllite and is suggestive of a high sulfidation mineralizing system.
The samples differ in their degree of sericitization
The mineral composition of the main components in rocks adds no information: total sericitization
and regenerational displacement of quartz in the final lithification process mask the primary characteristics of rock formation.
The clay mineral suite and the clay contents are consistent with feldspar alteration mechanisms associated with sericitization
Wall rock alteration adjoining the reef includes silicification, sericitization
and sulphidation (predominantly pyrite).
, and chloritization), as indicated by petrographic observation, and are not the result of magmatic fractionation.
With depth, approaching the water table, chalcopyrite starts to appear as does an increase in sericitization
and silica flooding, as well as an increase in gold values.
Albitization and sericitization
of plagioclase led to the mobilization of Ca whereas elevated concentrations of K and Ba seem to be related to the newly formed hydrothermal K-feldspar.
Alteration includes silicification, sericitization
, carbonatization and sulphide mineralization.
is quite strong within this structure.
Gold mineralization at La Victoria, is hosted by a shallow dipping panel containing several stacked ore-bearing zones characterized by intense silicification, carbonation, sericitization
, minor amounts of pyrite and arsenopyrite, and occasionally free gold.