When an unrepresented accused pleads guilty in proceedings under s 271(2)(b) of the Criminal Procedure and Evidence Act, the trial court has a positive duty to: (1) carefully explain all essential elements of the offence in sufficient clarity and detail; (2) ensure the accused genuinely and unequivocally admits to the charge and all its essential elements; (3) advise the accused of their constitutional right to legal representation, particularly where mandatory minimum sentences apply; (4) not assume every fact is proved merely because it is admitted, especially where difficult legal concepts like "possession," "prospecting," "consent," or "knowledge" are involved; and (5) consider whether the complexity of the case, the difficulty of legal concepts, or the severity of potential punishment requires entering a not guilty plea or ensuring legal representation is obtained. A conviction will be set aside where the facts admitted do not support the essential elements of the offence charged, even where the accused pleaded guilty. The terms "prospecting" and "possession" are not synonymous - prospecting involves searching for or looking for minerals, while possession involves having control over minerals already known to exist.