II. Intangible Assets A. Depletion Baker purchased a gravel field for $500,000. It should produce gravel for 8 years and then will be donated to the county as a park. The DNR requires that the land be restored so that it can be used as a park. The anticipated restoration cost is $100,000. Money would be set aside for this purpose and would earn a 3% annual return. Calculate the depletion base Calculation Cost Restoration At the end of the year, 100,000 tons of gravel have been removed and it is estimated that 400,000 tons remain at year end. Calculate the depletion for the year and the cost per ton