The attention and care legally required of a person (for example a claim holder) while that person has temporary possession of a property. With regards to mining claims, the courts have said that due diligence requires that "the exploration for minerals should be made within a reasonable time" and that, "The failure to make such exploration within a reasonable time, and to make it with such thoroughness and certainty as to determine the existence of mineral or oil, would be fatal to the agreement (claim)". Legal requirements 923 for "diligence" may include annual improvements to the claim and the filing of reports and notices.