(t) for so long as may be necessary for the purpose of any examination, investigation, trial or inquiry or, in the case of land, the carrying out thereon- (i) of work for the purpose of the conservation of natural resources of any description; or (ii) of agricultural development or improvement which the owner or occupier of the land has been required, and has without reasonable and lawful excuse refused or failed, to carry out; (u) where the property consists of any licence or permit; (v) where the property consists of wild animals existing in their natural habitat or the carcasses of wild animals; (w) where the property, is held by a body corporate established by law for public purposes and in which no moneys have been invested other than moneys provided by Parliament; (x) where the property is any mineral, mineral oil or natural gases or any rights accruing by virtue of any title or licence for the purpose of searching for or mining any mineral, mineral oil or natural gases- (i) upon failure to comply with any provision of such law relating to the title or licence or to the exercise of the rights accruing or to the development or exploitation of any mineral, mineral oil or natural gases; or (ii) terms of any law vesting any such property or rights in the President; (y) for the purpose of the administration or disposition of such property or interest or right by the President in implementation of a comprehensive land policy or a policy designed to ensure that the statute law, the Common Law and the doctrines of equity relating to or affecting the interest in or rights over land, or any other interests or rights enjoyed by Chiefs and persons claiming through or under them, shall apply with substantial uniformity throughout Zambia; (z) in terms of any law providing for the conversion of titles to land from freehold to leasehold and the imposition of any restriction on subdivision, assignment or sub-letting;