Depletion Method or diminishing method

Depletion is the annual charge for the use of natural resources. In order to compute depletion, it is first necessary to establish a depletion base, which is the amount of the de­pletable asset.

The depletion base includes the following elements:

Acquisition costs—The cost to obtain the property rights through purchase or lease, royalty payments to the property owner,
Exploration costs—Typically, these costs are expenses as incurred; however in cer­tain circumstances in the oil and gas industry, they may be capitalized,
Development costs—Intangible development costs such as drilling costs, tunnels, shafts, and wells,
Restoration costs—The costs of restoring the property to its natural state after ex­traction of the natural resources has been completed.


The amount of the depletion base, less its estimated salvage value is charged to depletion expense each period using a depletion rate per unit extracted, or unit depletion rate that is computed using the following formula:

1


×


Depletion base


×


Units extracted

Total expected recoverable units

The unit depletion rate is revised frequently due to the uncertainties surrounding the recovery of natural resources. The revision is made prospectively; the remaining undepleted cost is allocated over the remaining expected recoverable units.

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