accumulated depletion
The cumulative amount of depletion expense pertaining to the natural resources shown on the balance sheet. The account has a credit balance and will be reported on the balance sheet as a contra asset.
accumulated depreciation
The amount of a long-term asset's cost that has been allocated to Depreciation Expense since the time that the asset was acquired. Accumulated Depreciation is a long-term contra asset account (an asset account with a credit balance) that is reported on the balance sheet under the heading Property, Plant, and Equipment.