div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: · DTH drilling is primarily percussive drilling using the energy imparted by the hammer piston to the rock to dril rig blow air through to ensure all internal parts are lubricated src=https:reader030vdocumentsusreader030viewer20220218035b94f9a009d3f2d7438ba268html5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 2button div class=ts-image amp-img class=ts-thumb alt=Page 2: · DTH drilling is primarily percussive drilling using the energy imparted by the hammer piston to the rock to dril rig blow air through to ensure all internal parts are lubricated src=https:reader030vdocumentsusreader030viewer20220218035b94f9a009d3f2d7438ba268html5thumbnails2jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 3button div class=ts-image amp-img class=ts-thumb alt=Page 3: · DTH drilling is primarily percussive drilling using the energy imparted by the hammer piston to the rock to dril rig blow air through to ensure all internal parts are lubricated src=https:reader030vdocumentsusreader030viewer20220218035b94f9a009d3f2d7438ba268html5thumbnails3jpg width=142 height=106 layout=responsive amp-img divdivdiv class=ts-pagebuttonPage 4button div class=ts-image amp-img class=ts-thumb alt=Page 4: · DTH drilling is primarily percussive drilling using the energy imparted by the hammer piston to the rock to dril rig blow air through to ensure all internal parts are lubricated src=https:reader030vdocumentsusreader030viewer20220218035b94f9a009d3f2d7438ba268html5thumbnails4jpg width=142 height=106 layout=responsive amp-img divdiv