Meteorological action on rocks and old hewn stone in the High Andes mountain range region with dissimilar climatic conditions is analyzed. An experiment carried out at more than 3,000 meters (above sea level), in sites 200 kilometers away from each other, showed the open weather disparity of effects and has posed a dilemma regarding their causes of decay. Reasons for disintegration are analyzed and some operations to be made or started at the archaeological site itself are suggested. Treatments carried out deal with the cleaning methods through doughs which retain dirt without rubbing the pieces. In regard to washing, the criterion followed is not to immerse violently or over long periods of time a piece weakened by salting in a permeable consolidant, but to extract soluble elements before any consolidation process. To accomplish such a procedure with minimal risks a safe basket prop is suggested. Bonding of broken rocks depends fundamentally on structural conditions, state, and size. A specific classification on the matter was made stating the adhesives tried out by the Instituto Técnico de Restauracion on the sites.