BULLOCK GOLD MINING
Seth Bullock, the owner of Bullock Gold Mining, is evaluating a new gold mine in South
Dakota. Dan Dority, the companys geologist, has just finished his analysis of the mine site. He
has estimated that the mine would be productive for eight years, after which the gold would be
completely mined. Dan has taken an estimate of the gold deposits to Alma Garrett, the
companys financial officer. Alma has been asked by Seth to perform an analysis of the new
mine and present her recommendation on whether the company should open the new mine.
Alma has used the estimates provided by Dan to determine the revenues that could be expected
from the mine. She has also projected the expense of opening the mine and the annual operating
expenses. If the company opens the mine, it will cost $650 million today, and it will have a cash
outflow of $72 million nine years from today in costs associated with closing the mine and
reclaiming the area surrounding it. The expected cash flows each year from the mine are shown
in the table on this page. Bullock Mining has a 12 percent required return on all of its gold
Year Cash Flow
Construct a spreadsheet to calculate the payback period, internal rate of return, modified
internal rate of return, and net present value of the proposed mine.
2. Based on your analysis, should the company open the mine?
Bonus question: Most spreadsheets do not have a built-in formula to calculate the payback
period. Write a VBA script that calculates the payback period for a project.