Mines et Geologie no. 23 (Symposium sur le gisements de plomb-zinc en Afrique), p. 205-240 Routhier, P., 1963, Quelques gites du nord de la Tunisie, in Les gisements metal-lif^res -Geologie et principes de recherches: pt. 1, Masson et Cie, Paris, p. 367-370 Rouvier, H., 1967, Sulfures et regime hydrodynamique du milieu de sedimentation; exemple tunisien, le mineral de plomb du Koudiat Safra: Mineral. Dep., ν. 2, p. 38-43 (Engl. Summ.) 1971, Mineralisations plombo-zinciferes et phenomene karstique exemple tunisien: Le gisement du Djebel Hallouf: Mineral. Dep., ν. 6, p. 196-208way after the solidification of the intrusive and after it had been further broken. Where the ore fluids got their metallic (and sulfur) content, he is not sure, but he thinks it came from higher-temperature regions at depth. So far as I know, information on lead and sulfur isotope ratios is not available.All this seems to be a bit more complicated than is necessary, but the pseudo-aplite is a queer rock and as such may require a queer explanation.The minerals of the deposit range from mesothermal tennantite and bornite (of the lower portion of that range) down to telethermal chalcocite. The germanite and renierite also indicate mesothermal to leptothermal conditions. The abundant silver in the ores, not associated with the simple copper sulfides, is a marked indication of higher than telethermal conditions, probably confirm ing the idea that a considerable fraction of the ore was deposited in the lower mesothermal to leptothermal range; the chalcocite certainly is telethermal as probably is the digenite. The deposits are, therefore, here classified as mesothermal to telethermal.The oxidized minerals, of tremendous economic value, are definitely ascribable to the action of oxygenated ground water above the fluctuating water table and the enrichment minerals to similar waters, lacking oxygen, below it. These minerals are classified as ground water-B2.
