Nowadays, waste forms of mineral resources and production wastes of the Noril'sk Mining and Metallurgical Combine can be treated as potential objects of geotechnology, which may, in the future, be the most inexpensive and rational method of processing difficult-to-concentrate ores and industrial products. Among them, it is possible to isolate particularly complex ortes in technoIogical respects: a) tenacious fineiy disseminated sulfide copper ores; and b) production wastes after melting the sulfides in a molten bath (MBM). The natural climatic features of the Noril'sk region complicate geotechnological methods of processing; at the same time, however, the permafrost zone offers special advantages. The existence of data on the feasibility of the chemical transformation of mineral associations at negative temperatures served as a starting point tbr out studies [1-3]. These processes are associated with the existence of a film solution, which can be found in the liquid stare right down to temperatures several tens of degrees below zero [3, 4]. The problem consisted in experimental study of the feasibility of the cryogenic leaching of two entities of practical interest: a) difficult-to-separate (tenacious) wohlerite-containing copper «)re from the Talnakh Deposit; and b) MBM slags. The materials for the investigations were obligingly submitted by V. V. Rybas, a co-worker of the GMOITS, Noril'sk Mining and Metallurical Combine.'E: DESCRIPTION OF SUBJECTS OF INVESTIGATION Petrographic study of microsections and metallographic specimens indicated that pyrrhotine with flame-shaped pentlandite ingowths is the basic ore mineral in the copper ore. Pyhrrotine is encountered in two varieties. Rather coarse grains (0.5-1.5 mm) form early on, and have irregular-shape inclusions later on. Magnethe and marcasite form substitutional network structures in the coarse grains of the early pyrrhotine. Also observed are pure magnetite grains, which are bordered by ilmenite. Chalcopyrite, which is found in intimate intergrowth with the later phyrrotine and magnetite, is present in significant quantities. The latest and most widely disseminated lamillar wohlerite is evolved from the ore minerals occupying the intergrain space of the nonmetallic, highty serpentinous minerals. The ore CTable 1) contains more than 1% Of copper, up to 1% of nickel, and 0.04% of cobalt with 16% of iron. In the MBM slags, the ore mineralization is, by its own nature, a finely disseminated distribution of ore grains with a.size ranging from 0.003 to 0.02 mm. According to rated values and to an x-ray analysis performed by E. P. Solotchina in the Institute of and, as well as on the basis of examination of microsections and metalIographic specimens, the ore minerals are primarily magnetite, pyrrhotine, and chalcopyrite, whose dissemination, which is coordinated to interstices between elongated olivine crystals, is usually cemented by a glassy mass. The earlier magnetite forms skeletal crystals, which are disposed within similarly oriented olivine grains. Chemical analysis indicated that the average element content in the slag is as follows: =0.9% of copper. 0.15% of nickel, and 0.05% of cobalt with a 45% iron content.