Revett Minerals (RVM-T) is planning a new resource estimate for four mineralized zones on its Troy copper-silver mine in Montana, following an underground drilling program.
Revett outlined four mineralized horizons, all below the present underground workings at Troy. One, the I-Beds, was previously known, but three are new discoveries in quartzite horizons A, B and C in the Lower Revett formation.
In the A-Bed target, 55 metres below the mine workings, drill holes intersected zones mainly 8.5 to 13.5 metres thick, with copper grades of 0.2% to 0.3% and silver grades ranging from 13 to 32 grams per tonne. Two intersections in the B-Beds, 99 metres below existing workings, were 4.9 metres grading 0.2% copper and 18.9 grams silver per tonne, and 8.4 metres grading 0.65% copper and 44.6 grams silver.
Five mineralized intersections in the C-Bed horizon were 5 to 11 metres thick, running 0.5% to 0.6% copper and 50 grams to 70 grams silver per tonne. Those intersections were about 113 metres below existing development.
Provided the A, B and C-Bed horizons can be brought into reserves, Revett would have the option of developing that nearby mineralization before attempting to access the I-Bed horizon, 340 metres below the workings.
Drilling on the I-Beds retuned a number of mineralized intersections, from 4.6 to 11 metres in thickness. Copper grades were mainly between 0.2% and 0.3%, with anywhere from 9 to 50 grams silver per tonne.
Revett also drilled a series of holes in the Upper Revett formation’s “Lower Quartzite” horizon. Those intersected stratabound copper and silver mineralization grading 0.2% to 0.5% copper and 17 to 38 grams silver per tonne. The mineralized zone ranges from 5 to 9 metres thick.
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