"Purpose to deprive" means to have the conscious object:

A. To withhold property permanently or for so extended a period or to use under such circumstances that a substantial portion of its economic value, or of the use and benefit thereof, would be lost; or

B. To restore the property only upon payment of a reward or other compensation;

C. To dispose of the property under circumstances that make it unlikely that the owner will recover it. (Code 1975 § 13-640-1(C))