Compania Minera Poderosa SA He has been conducting operations in the ore deposits in the RA2120 section of 4.5 x 4.5 m in Nv. 2120 San Francisco Lode mine Pataz. Reservoir characteristics are irregular, being unstable areas, qualifying as rock MF / P (much fractured poor soil), generating sobrerotura and damage to the crown, and increase the percentage of dilution. The operation is carried out in a conventional manner and are checked overconsumption of explosives, which is reflected in the so-called load factor indicator. Other deficiencies relate to blasting explosive improper drill column instead of 66 % were carried more than 75 %, resulting on excavations and increased the cost of drilling and blasting. In drilling deviations in parallelism they are detected by the absence of guiding , taking the burden no uniform remains and becomes larger at the bottom of the bore , affecting the f...