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Analysis of mining operations after two and a half years of work by the Project DMD - from the 2011, made in software for strategic planning - Whittle Fx, indicates a deviation from the planned dynamics, and problem of achieving the design planned production of 10.6 million tons of ore in 2014. It also points out the reduction of annual average copper content in the ore, increased overburden ratio in the next period regarding to the planned, thus reducing the economic effects of excavation as a consequence of the previous delay in stripping. Consequently, these facts challenging the planned copper recovery from the ore in the flotation process and planned concentrate quality. Altogether acts as a negative impact on the economic effects of business. Although the necessity of finding the short-term solutions in situations where delay in stripping is present as well as danger in discontinuity of ore excavation, a common practice is to resolve the problem deviating from design solutions, which is basically just a postpone effect of delay. Until now, the delay in stripping has reached the figure of 24,280,718 t.

Stripping delay analysis in relation to designed long-term plan of excavation at the open pit Veliki Krivelj