This Paper describes the observational method developed for the economic study of the treatment of gold mine workings and their relationship to the proposed structures above them. The philosophy behind the contract documentation required by this method is discussed and case histories illustrate its successful use. L'article décrit la méthode d'observation qui a été mise en oeuvre lors de l'analyse économique des travaux d'exploitation d'une mine d'or et de leurs relations avec les structures de surface proposées. La philosophie du contract nécessaire à cette méthode est analysée et illustrée par quelques cas.
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