TY - THES

T1 - Optimization of the Drill and Blast Work in Drift Development in the Underground Marble Mine Sterzing of Omya S.p.A.

AU - Wimmer, Matthias

N1 - embargoed until null

PY - 2006

Y1 - 2006

N2 - The purpose of this thesis constituted the optimization of the drill and blast work applied in drifts in the underground marble mine Kristallina, by Omya S.p.A., in Vipiteno, Italy. In order to lower drift development costs, especially with respect to explosives and amount of fines produced, the high specific charge concentration as well as the high specific borehole amount were assessed. Regarding the specific charge concentration a decreased borehole diameter turned out to be technically feasable and has led to an economical improvement. Concerning a reduction of the high specific borehole amount, experimental tests on the blastability (Critical Burden Method) both in model and large scale tests have been performed. For practical mining, it was essential to find a geometric arrangement for boreholes (burdens and spacings) before the critical burden is reached at which the specific charge, which is in direct correlation to the burden, shows a minimum and therefore has a positive influence on the size distribution of the blasted rock. The newly developed drilling and blasting pattern was then realized in a full round blast and both a technical and economical comparison of the current and the new drilling and blasting patterns applied in drifts was drawn.

AB - The purpose of this thesis constituted the optimization of the drill and blast work applied in drifts in the underground marble mine Kristallina, by Omya S.p.A., in Vipiteno, Italy. In order to lower drift development costs, especially with respect to explosives and amount of fines produced, the high specific charge concentration as well as the high specific borehole amount were assessed. Regarding the specific charge concentration a decreased borehole diameter turned out to be technically feasable and has led to an economical improvement. Concerning a reduction of the high specific borehole amount, experimental tests on the blastability (Critical Burden Method) both in model and large scale tests have been performed. For practical mining, it was essential to find a geometric arrangement for boreholes (burdens and spacings) before the critical burden is reached at which the specific charge, which is in direct correlation to the burden, shows a minimum and therefore has a positive influence on the size distribution of the blasted rock. The newly developed drilling and blasting pattern was then realized in a full round blast and both a technical and economical comparison of the current and the new drilling and blasting patterns applied in drifts was drawn.

KW - Optimization Drilling and Blasting Pattern Photogrammetry Blastability Burden

KW - critical Charge Concentration

KW - specific Borehole Amount

KW - specific Energy Entry

KW - specific Fragmentation

KW - Optimierung Bohr- und Sprengplan Photogrammetrie Sprengbarkeit Vorgabe

KW - kritische Lademetergewicht

KW - spezifische Bohrlochbedarf

KW - spezifische Energieeintrag

KW - spezifische Fragmentierung

M3 - Diploma Thesis

ER -