All mining claims are initially unpatented claims, which give the right only for those activities necessary to exploration and mining, and last only as long as the claim is worked every year. For instance, the failure to prosecute the work on the tunnel for six months is considered the abandonment of rights to all the undiscovered veins on the line of the tunnels. In addition, at least $100 worth of labor shall be performed or improvements made annually. If this does not occur, the claim or mine upon which such failure occurred shall be made to relocation in the same manner as if no location of the same had ever been made. The original mining law gave miners the opportunity to obtain "patents" (deeds from the government), much as farmers could obtain title under the Homestead Act. The owner of a patented claim can put it to any legal use. The process of patenting claims has been perhaps the most controversial part of the mining law. Because of a Congress-imposed moratorium, the federal government has not accepted any new applications for mining claim patents since October 1, 1994.