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The supergene mineralization will be the initial focus for resource definition, as preliminary laboratory test work confirms it is amenable to low-cost, acid heap-leaching. Most of the results for sequential copper leaching tests performed on core sample pulps have been received and are summarized in Table 3. The recoveries average about 80% for supergene mineralization averaging about 0.6% copper.
Table 3. Sequential copper leach results - Phase 1 and 2.
---------------------------------------------------------------------------Hole From (m) To (m) Interval Total Cu% Recovery %---------------------------------------------------------------------------OKA-001 2 46 44 0.73 78%---------------------------------------------------------------------------OKA-002 20 38 18 1.10 86%---------------------------------------------------------------------------OKA-005 63 81 18 0.58 59%------------------------------------------------------------------------------------------------------------------------------------------------------OCA12DH003 1.3 78 76.7 0.35 55%including 27 59.9 32.9 0.44 77%---------------------------------------------------------------------------OCA12DH004 4 37.5 33.5 0.49 91%---------------------------------------------------------------------------OCA12DH005 5 37 32 0.54 92%---------------------------------------------------------------------------OCA12DH006 11 61 50 0.60 80%---------------------------------------------------------------------------OCA12DH007 30 87.6 57.6 0.71 89%---------------------------------------------------------------------------OCA12DH009 54 63.8 9.8 1.44 94%---------------------------------------------------------------------------OCA12DH010 pending---------------------------------------------------------------------------OCA12DH012 22 69.5 47.5 0.64 76%---------------------------------------------------------------------------OCA12DH013 32 83 51 0.54 90%---------------------------------------------------------------------------OCA12DH016 pending---------------------------------------------------------------------------OCA12DH017 49 55 6 0.45 80%---------------------------------------------------------------------------OCA12DH018 34.55 50.45 15.9 0.26 86%---------------------------------------------------------------------------OCA12DH019 pending---------------------------------------------------------------------------Total Cu% is sum of acid, cyanide, and residual Cu assays; Recoverypercentage is the total copper leached by both acid and cyanide divided by the total copper
The climate and geography of the project site make it ideal for a heap-leach operation. Indico will prepare composites for initial metallurgical test work once the sequential leach data is complete. Based on the successful Phase 2 results, Indico plans to continue with a Phase 3 program of about 30 short (100 metre) infill drill holes at about 100-metre spacing to further delineate the supergene blanket. This programme is expected to start in early 2013.
