202 productivity. Under this assumption, increasing availability through improved maintenance should lead to higher utilization and, consequently, greater production. Nevertheless, in real underground operations, equipment may remain available but not fully utilized due to issues such as lack of work areas, insufficient operators, limited services (energy, water, ventilation), or transportation constraints. This disconnect generates uncertainty in operational decision-making because it becomes difficult to determine whether productivity losses are driven mainly by maintenance failures or by operational inefficiencies. For this reason, it is necessary to analyze the relationship between availability and utilization through the concept of operational elasticity, which allows quantifying how sensitive utilization is to changes in availability and identifying whether operational conditions prevent availability from being converted into effective production. 3. OBJECTIVES 3.1. General Objective To evaluate the operational performance of long-hole drilling jumbos through the analysis of operational elasticity between mechanical availability and utilization, identifying the operational factors that limit their efficiency in underground mining. 3.2. Specific Objectives ● To evaluate the operational performance of long-hole drilling jumbos through the analysis of operational elasticity between mechanical availability and utilization, identifying the operational factors that limit their efficiency in underground mining. ● To analyze jumbo operational performance through the KPI of meters drilled per hour (m/h), comparing its behavior according to shift and operational calendar. ● To identify the main operational delay causes that affect effective jumbo utilization, limiting the conversion of availability into productive use. 4. HYPOTHESES 4.1. General Hypothesis Negative operational elasticity between mechanical availability and jumbo utilization reflects that operational delay times, beyond mechanical aspects, limit the proportional increase of utilization when availability improves. 4.2. Specific Hypotheses ● There is negative operational elasticity between mechanical availability and utilization, showing that an increase in availability does not necessarily generate a proportional increase in equipment utilization. ● Drilling performance (m/h) varies between day and night shifts; however, these variations are not exclusively attributable to mechanical availability, but also to operational and management conditions. ● Operational delays not associated with the mechanical condition of equipment (such as operator absence, planning, work organization, and coordination) represent the most influential factors in reducing effective utilization.
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