
in corporate income tax, the deductions from gross income allowed investors in exhaustible mineral deposits (including oil or gas) for the depletion ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/d/32

a reduction in US taxes for owners of an economic interest in minerals in place to compensate for the exhaustion of an irreplaceable capital asset. This economic interest includes mineral interest, working interest in a lease, royalty, overriding royalty, production payment interest, and net profits interest.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

a tax reduction allowed on income from exhaustible resources, as oil or timber.
Found on
https://www.infoplease.com/dictionary/depletion-allowance
No exact match found.