Line 13g – Mining costs

If you elected the optional 10-year write-off under IRC Section 59(e) for regular tax, skip this line. For AMT, you must capitalize your mining exploration and development costs and amortize them over 10 years beginning with the taxable year you paid or incurred the expenditures. Enter the difference between your AMT mining amortization and your regular tax mining deduction. If your AMT mining amortization is more than your regular tax mining deduction, enter your adjustment as a negative amount.

See IRC Section 56(a)(2)(B) for special rules that apply to losses related to mining property.