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how are costs calculated for a quarry

operational costs, having as field of application in Viana quarry. All costs are based on average 1989 dollars. Cost indexes used for the models are summarized for the years 1986-2017. The index factor is given by the following expression: 2 We considered an index factor equal to Findex= 2 Findex2= Fa Fb (1.5)

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