Answer:
a. Depletion rate:
= Mineral rights acquisition costs / Estimated mineral deposits
= 494,000,000 / 475,000,000
= $1.04 per ton
b. Depletion expense for current year:
= Depletion rate * Minerals mined and sold in current year in tons
= 1.04 * 31,500,000
= $32,760,000
c. Journal entries:
Date Account title Debit Credit
12/31-20XX Depletion expense $32,760,000
Accumulated Depreciation $32,760,000