A second means for accumulating undue wealth is through the exploitation of mines. Islam deals with this issue by giving the state the right to impose a royalty of one-fifth of the produce of the mine. This fifth is due on any income derived from the mine. Any excess income saved by the owners of the mine for over a year will be separately subject to zakat year after year. In this way, the government has a direct ownership stake in the mines. It also has a share in the money saved from excess income of the mines, which it collects for the benefit of the poor.