Okla. Stat. tit. 19, § 1101

The board of county commissioners of any county may, by resolution, provide for the establishment of a countywide economic development program and may provide for the financing thereof from the county general fund. After the passage of said resolution by the board of county commissioners, the county excise board shall annually appropriate an amount up to and not to exceed one-half mill on the dollar of the proceeds of the ad valorem tax levy in such county for the establishment and operation of a countywide economic development program. The amount of any such appropriation not expended at the end of the fiscal year shall revert to the county general fund.