Line 13b – Depletion

For AMT, if the depletion deduction for mines, wells, and other natural deposits determined under IRC Section 611 exceeds the adjusted basis of the property at the end of your taxable year, you have a depletion preference adjustment.

To figure your adjusted basis, use the rules in IRC Section 1016, but do not reduce the adjusted basis by current-year depletion. Figure the excess amount separately for each property. Enter on this line only the depletion amount that exceeds your adjusted basis.