Radioactivity in so-called “Kuroko” deposits was first reported by Mr. I. ASAI in 1920. He described: “…The radloactivity of Kuroko may have been related to the presence of rodiobarite in the ore”. Recently, in 1960, radiobarite, occurring in close association with uraniferous clayey rocks, was confirmed by the author from the Iwami gypsum mine, Shimane Prefecture. The author recognized that the radioactivity was closely related to the clay minerals of hydrothermal origin. Then the author took geologic reconnaissances at the Hanaoka copper mine, Akita Prefecture, and at the Asahi gypsum mine, Fukushima Prefecture, and he detected radioactivity from clays of similar occurrences at the Iwami mine.
Radioactive anomaly was detected at marginal part, lower grade gypsum ores, and pyrite are body as much as 220μr/h. The clays of some 50μr/h expose at a level for about 5-20m in length, and the intensitivepart for about 1 to 2m across. Average uranium content of grabed samples is 0.01 to 0.08 per cent containing minor amounts of Zr, Mo, Sr, Rb, TI, and others. Uranium is fixed in sericite, chlorite, nacrite (a kaolin mineral), and in montmorillonite. It is nortworthy that at the Iwami mine, honey yellow, transparent radiobarite is closely associated with chlorite or montmorillonite. The barite is not plumbian like hokutolite, but contains some quantity of strontium.
The envelope of these, in general, is constituted of a zonal distribution of concentric zones of clay minerals of hydrothermal origin, they are kaolin-sericite-chlorite-montmorillonite, from center to margin, respectively.
It has been revealed by the author that the uranium is mostly enriched at the clays of sericite-chlorite zone, especially of tuffaceous rocks origin.

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In order to present fundamental data for the theoretical research on the gas drainage practice, the authors have carried out experimental as well as theoretical studies on the flow of methane through coal measure rocks, and have obtained Eq.(7) strictly representing the relation among the quantity of gas, the pressure gradient, the length of flow and so on. They have found that the Darcy's law is applicable fairly well and have presented Eqs.(12) and (13) for practical use, with the charts to determine the permeability direct from the results of measurement.

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Various values of surface tension of quartz have been given already but reliability of those values is very questionable.
Author observed the surface tension of amorphous quartz fibre (radius 0.3-10μ) and found that the relation between radius and surface tension was shown as follows w=πr²σ+2πr·γ; w: weight which is necessary for breaking of quartz fibre; r: radius;σ: tensile strength;γ: surface tension The values of σ and γ of quartz fibre were found to be 65 kg/mm² and 1348480 dyne/cm, respectively.

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The author have investigated on wetting characteristics of galena produced from Japan by means of spheroidal drop method. Advancing contact angles were affected with roughness and chemical composition of samples. A formation of new crystal on the surface of depressed galena was determined by electron diffraction method, and the wetting characteristics depend on nature of the crystal. The main results obtained are as follows:-
(1) Contact angle depends on roughness of surface, and its value of fresh cleavage is greater than that of emery polished surface.
(2) Contact angle is affected with chemical composition and its value decreases especially with increasing of silver content.
(3) Contact angle of the sample preconditioned in potassium permanganate solution decreases linearly with increasing of concentration of the solution.
(4) Surface of galena was slightly oxidized by potassium permanganate solution, and then manganese oxide hydrate MnO₂·(0-1) MnO·nH₂O was found on it by means of electron diffraction.

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In order to study the magnetic properties of the nickel matte containing Ni, Fe and S, the measurement of the intensity of magnetization and the thermomagnetic aoatysis were performedwith the specimens of the ternary system Ni-Fe-S and the specimens taken from the nickel converter.
The ferromagnetic range in the binary system Ni-S was between Ni and Ni₃S₂ and the intensity of magnetization decreases linearly with the increment of the content of S. These ferromagnetic specimens show the Curie point at about 360°C, and the ferromagnetism in this binary system wasfound to be due to the metallic nickel contained in the specimens.
In our Experiment of the ferromagnetic field of the ternary system Ni-Fe-S whichis surrounded with the line Ni-Ni₃S₂-(Ni, Fe) ₉S₈-FeS-Fe, the intensity of magnetization decreases with the increment of the content of S toward the line Ni₃S₂-(Ni, Fe) ₉S₈-FeS. Various curves of the thermomagnetic analysis were obtained in the ternary system (see Fig.5), and in the sections of constant content of S, the Curie point of the specimens increases from 355°C with decreasing the content of Ni, and after it reaches at about 600°C, it remains constant for a fairly wide range of the composition. It decreases a little from this temperature below about 20 atom.% Ni (see Fig.6). These results may be due to the change of the composition of the alloy phase contained in the nickel matte.
The magnetic transformation found in the region π+δ+γ, which is at about 480°C in the heating and at about 420°C in the cooling, seemed to be due to the order-disorder transformation of the Ni3Fe lattice.
The amount of the change of the intensity of magnetization in this transformation increases a little when the specimens were held at 430°C for long time.
In thd specimens of high Fe content, α⇔γ transformation of the Ni-Fe alloy phase were also observed.
The results of the investigation on the specimens taken from the nickel converter coincide well with those of the ternary system prepared artificially.

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In connection with the establishment of the most effective method for treating of lead anode slime, fundamental studies were made to enlighten the form of Bi, Sb, As and Ag in anode slime by X-ray analysis. The results obtained are as follows.
Slimes from Pb-Bi anodes.-Identification by X-ray diffraction showed that metallic Bi was present in these slimes. Metallic Pb was also detected in the slimes from low bismuth anodes.
Slimes from Pb-Bi-Sb anodes.-The existence of Bi-Sb solid solution, metallic Bi and Sb was determined.
Slimes from Pb-Bi-As anodes -The main constituents of these slimes were metallic As and Bi.
Slimes from Pb-Bi-Sb-Ag anodes-X-ray analysis revealed the presence of ε and ε phase of Ag-Sb alloy.
Slimes from Pb-Bi-As-Ag anodes-No intermediate phase was found. Metallic Bi, As and Ag were. contained in these slimes.
Slimes from lead electrolytic refinery.-The presence of ε, ε' phase of Ag-Sb alloy, crystalline As₂O₃, Bi-Sb solid solution and lead sulphate was confirmed. From the amount of water soluble As and X-ray analysis, the existence of amorphous As₂O₃ was suggested.

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