Answer and Explanation:
The Journal entry is shown below:-
Depletion expense - Coal Deposit Dr, $280,000
(($900,000 - $100,000) ÷ 200,000) × 70,000
To Accumulated depletion -Coal Deposit $280,000
(Being depletion expense for the current year is recorded)
For recording the depletion expense for the current year we simply debited the Depletion expense - coal deposit as it increased the expenses and we credited the accumulated depletion -coal deposit as it reduced the value of the assets