Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, TN 379, 1991 Mar; :1-2
Objective: Enable prospective in situ leach mine operators to evaluate the economic potential of an ore body by using a user-friendly, computerized in situ copper oxide leach mining cost model. Background: As part of its research on in situ leach mining technology, the Bureau of Mines produced a 5-volume contract report that mining companies can use to design an in situ mining operation for copper oxide deposits. Written for the Bureau by the Science Applications International Corporation (SAIC) in 1988, the generic design manual also contains a computerized cost model for evaluating the economic feasibility of in situ leach mining for any specific copper oxide deposit. The cost model is to be used with Volume II of the contract report. But because of certain complexities associated with running it, the Bureau found that the model could be improved by making it more user friendly. Approach: The approach taken by Bureau researchers to make the original model more user friendly was to incorporate a HELP function to define input parameters, and to enable the display of output on the monitor. An accompanying handbook, U.S. Bureau of Mines Information Circular (IC) 9284, contains further details on running the 1990 model. How It Works: Even though the new computer program is menu driven, the user will need Bureau IC 9284 to run the program efficiently. Volume II of the contract report is still recommended for a more detailed understanding of in situ leach mining and for cost model insights. To run the new program, the user responds to monitor prompts with keyboard input. A tutorial on entering input data can be viewed at the initial screen prompt. Next, the input phase provides the input parameters with their default values. These parameters are grouped into various categories: (1) business-related variables, (2) site-specific ore body and well-field characteristics, (3) copper leaching, (4) program control, (5) well-system specifications and costs, (6) surface-plant specifications and costs, and (7) environmental costs. The user may change the value of any of the parameters. The HELP function allows the user to see the definition and the data range or default value for a particular parameter. An executable Fortran 77 program performs the calculations. The following outputs are then displayed: (1) design variable values and capital and operating costs, (2) pre-tax calculated selling price of cathode copper for a given discounted-cash-flow rate of return (DCFROR) or vice versa, (3) discounted initial value of investment, (4) annual operating costs, and (5) DCFROR cash flow table. This information may also be printed out.
Minneapolis, MN: U.S. Department of the Interior, Bureau of Mines, TN 379