Biotite (41%) forms leafy aggregates consisting of heteroblastic and subidioblastic individuals with pleochroism from brown to pale green, and moderate chloritization
The expected gold mineralization will be associated with breccia zones where the fault rock has been intensely sheared, altered and replaced with intense hematite and magnetite, chloritization
, silicification and copper oxides related to the fault.
The alteration assemblage includes beresitization, potash feldspathization, chloritization
, and carbonatization, occurring as bands in the ore-bearing faults and pervasive alteration of nearby wall rocks.
In active orogenic belt hydrothermal fluids alter feldspar and plagioclase into extremely fine grained quartz and mica in the form of muscovite or sericite by sericitization while the same fluids alter biotite and garnets into chlorite by chloritization
In examined amphibolites is this stage characterised by occurrence of carbonate veinlets and chloritization
the last Hercynian phase of folding, the overthrusting of the basement by the cover rocks with lamination of the dolomite and country rock, the percolation of magnesian hydrothermal fluids and chloritization
of the aluminosilicate facies (mica schist, aplite, pegmatite), and finally metasomatic "talcification" of the dolomite and siliceous rocks.
On the other hand, upper limit of the time interval for emplacement of investigated dykes is defined by the origin of uranium hydrothermal mineralization, which caused chloritization
and albitization of granodiorite porphyries.
Silicification, sericitisation and chloritization
are the principal alteration types observed in the mine.
Sericitization, hematization, argillitization and chloritization
alterations are observed in wall rocks around mineralizations (Table 2).
Albitization of the original plagioclase, chloritization
of biotite and enrichment in hematite are common.
The Big Bug / Old Miner horizon is now thought, because of its intense chloritization
, to be a vent feeder zone, so that the most likely place for a major deposit would be up-sequence and to the west, which would be in the Main Copper Mountain Claim Block.
Hydrothermal alteration zones, quartz-pegmatite veins and veinlets and dykes of sub-volcanic origins with intensive silicification, pyritization, and chloritization
occur around the granodiorite stock body.