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Delineating graphite mineralization zones using Integrated Geophysical techniques near Morogoro, Tanzania

Country: Tanzania            Region: East-Central Africa           Period: 2018            Commodity: Graphite.

Geophysical investigation was conducted in two conjugate graphite concession totalling about 45 sq. km., of which about 50-hectare area in these prospects were evaluated. Objective of the assessment in different areas was to gather a holistic view of the presence of graphite in a complex geological setting, one that is not visible on the surface in totality. The geological inputs suggested presence of dolomite & marble along with Proterozoic granulite facies rocks & biotite gneisses. Mineralization is observed to be strata bound in schistose form with these formations. 

Objective of the program were meted employing two methods of survey included in the scope of work as, 

  1. Geophysical investigation by mean of Self-Potential method based on response of natural current & generating anomaly response over more conductive zones, the graphite bodies being highly conductive. 
  2. Identify the potential graphite bearing area based on processing & interpretation of SP survey. 
  3. 2D Electrical Imaging (Resistivity & IP) across the identified anomaly zones to interpret nature of the conductivity profile in the sub-surface. 

SP method of survey assisted in identifying potential mineralization zone based on which blocks were identified for further investigation; in the process, SP data was gathered for the designated areas at 50 m profile spacing & 10 m electrode interval, for a cumulative of 13.5 LKM.  SP survey followed with 2D Imaging survey was conducted for a cumulative 2.6 LKM along 10 profile lines targeting a probe depth of 100 m from surface level. 

The investigation revealed presence of mineralization zones with significant volume of potential resources and hence further exploration & resource estimation have been recommended. Initial exploration in pitting revealed presence of good grade of flaky graphite presence within graphite schist instilling confidence to proceed further into detailed exploration program.

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