Geology & Reserves E

Geology & Reserves

The geological formations in the Hutti area consists of the pre-cambrian metavolcanic rocks of the Dharwar  system (consisting  of metabasalts  with acid  volcanic rock  and  chlorite biotite schists). Chlorite-biotite schist generally form the host rocks for gold mineralisation and occur as parallel to sub-parallel lode zones.

 

The main auriferous zone of the Hutti Gold Mines consists of nine known reefs namely, Main, Oakley's, Middle, Zone-I, village, Strike, Foot-wall & Hanging wall of Strike & New East Reefs. The general trend of the lodes is N200W-S200E and dip steeply due west at 60-700, usually occur in an en-echelon to mylonitised pattern along with shear fractures. Theses lodes abruptly stop at the schist-granite contact in the southern part of the area, whereas in the North they continue beyond the major dolerite dyke of about 70.00 m. The gold quartz mineralisation is confined to the chlorite-biotite schist zones traversed by quartz veins which are considered as the alteration products of metabasalts along the parallel to sub-parallel shear zones and structures such as minor cross-folds, shear fractures and other dilatants structures appear to have controlled localization of mineralisation. Branching of the lodes both along the strike and dip is another important structural feature. Quartz is the main filling, in the form of veins, numerous lenses and irregular pods occupying the shear fractures and shear cavities in the delation zones.

 

The total ore reserves estimated as on 31.03.2020 is 16.38 million tonnes at 4.38 g/t, upto 27th Level  (871  m).  Based  on  the  detailed  survey  with  ultra-violet  lamps  for  demarcating  the Scheelite rich zones and re-sampling of the mineralised zones, a total of 1,64,771 tonnes of Scheelite ore with a grade & 0.08 to 0.10% WO3 over 2.29mts widths, was proved so far. The major thrust in this mine is to establish the strike continuation and depth persistence  of the ore zones within the existing lease. In the Hutti South area, the recent surface diamond drilling and exploratory mining has established the potential mineralized zones. The evaluation of this exploration data has indicated that, further exploration inputs are required for mining feasibility studies. For this, it is planned to take up  further exploratory mining works at Grey shaft & South Hutti area.

 

Strategy

 

Establish additional proved ore reserve by –

 

          Building infrastructure and taking up mine development at shallow depth in new areas.

          Accelerating mine development by adopting new technology.

 

Last Updated: 10-07-2021 10:39 AM Updated By: Admin


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