Place: Colombia

Time: in August, 2013

Mine & project: Rio Negro, gold mining

DTH Drill rig: Atlas Copco ROC L6

DTH button bits configurations: DHD340A 115mm, flat face, hemi-spherical buttons,2 flushing holes;

Rock formation: Brecciated silica with clay matrix and disseminated sulfide mineralization, detailed photos as below:

Average life span of our DHD340A 115mm DTH button bits: 480 meters;

Average life span of a world famous brand A’s DHD340A 115mm button bits: 520 meters;

Considering different prices from our company and the world famous brand A, as below, the chart shows a drilling cost comparison between our brand and world famous brand A.

As below, here are some pictures about our DHD340A 115mm button bits performance: