As an aid to the interpretation ot I P. survey in the konomai gold mine, Hokkaido, the authors measured various parameters by means of both pulse and frequency variation methods and determined the immobilized ion concentration of rock membranes “A” from the membrane potential of rock specimens with KC1 solutions compared with families of the theoritical curves of Teorell-Meyer and Sievers equation.
The relationship between the characteristics of I. P.anomalies, the properties of rock specimens and “A” is discussed.
In the experiments, rhyolite disseminated with pyrite, vein quartz and shale were separately distinguished from other rocks by using the following parameters; the percent frequency effect (F. E.), metal factor (M. F.), resistivity (ρ) and polarizability (ΔV/V).
Small values of I. P. anomalies of the rock specimens in the region seem to be mostly characterized by the immobilized ion concentration of rock membranes. This fact seems to be caused by ion concentration and ion deficiency in the capillary paths of rocks and clays induced by current.
These results are helpful for the interpretation of field results relating the characteristics of 1. P. anomalies to geological and mineralogical properties.

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Determination of the strength of rocks is very troublesome since it takes much time and effort to produce good test pieces. Therefore some methods for rapid determination of the strength of rocks are strongly demanded. The authors have investigated how to determine the strength of rock with irregular test pieces, i. e. rock pieces which are not machined. By theoretical as well as experimental study, they have obtained such a method to determine rapidly the tensile strength of rocks that an irregular test piece is crushed into two pieces by a concentrated loadF, the distance between the points of loading being 2α, and then the tensile strength of the rock is given by 1.4F, 2πα²

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Generally speaking, Japanese coal seams are more heterogeneous than those in European coal fields in structural constitution, so it is very important to explore the actual state of their structural heterogeneity in our fields for the sake of studying on heir dangerous condition for the outbursts of gas and coals.
The authors investigated four seams, different in ratio of outbursts occurence, about four principal heads (material content, strength, rate of geological trouble, and properties for gas carrier) in separate coal bands under similar mining-geological situation at “Mitsui-Sunagawa No.1” coal mine. Through this work the structural heterogeneity of four seams was analyzed and expressed numerically and quantitatioely. On the other hand, the authors examined the applicability of four foreign calibrating formulas for the critical classification of coal seams on the danger of outbursts to our fields, and found it impossible to adopt them without concrete correction.
As a result of this analysis, the authors recognized that it was most important to consider the actual constitution of finly band of cooly argillite “Gan-Bai” more puluerized through tectonic action as a basic factor in case of determining the potential danger for the outbursts of our coal seams.

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The cutting mechanism is classified into three types, i. e.(1) flow type, (2) shear type, and (3) crack type.
It is assumed that fracture stress is shear in the former two types, and fracture stress is tensile in the last type.
I. EVANS discussed on the crack type cutting mechanism in his analytical reports.
On the shear type cutting mechanism, the analytical considerations by M. E. MERCHANT are well known in metal cutting.
In this report, the authors present a generalized formula for the crack type cutting mechanism, under some assumptions simillar to I.EVANS'S; and a new formula for the shear type cutting mechanism in the cutting process of brittle materials, modifying MERCHANT'S theory and depending on an extended GRIFFITH'S theory presented by McCLINTOCK.
Then depending on these formulae and some analytical considerations, the transient range of the shear and crack type cutting mechanisms is. determined.

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Chemical inter-diffusion coefficients of sulfur, selenium, and tellurium in liquid copper have been measured with the modified capillary reservoir method in the temperature range from 1, 100°to 1, 300°C. Several liquid Cu-S Cu-Se, and Cu-Te alloys ranging in composition from 0.2 to 0.8 wt% S, from 0.5 to 3. 0 wt% Se, and 5.0 wt%Te were used as the liquid alloys for reservoir. From the re-examination of the applicability of simplified equations for the calculation of diffusion coefficient, it was found that the equation derived by Derge et. al. can only be used when the ratio ofC_a/C_s, ratio between the average concentration of sample-C_aand the concentration of reservoir liquid C_s, is less than 0.6 or, θ(=π²Dt/4l²)<0.7. Experimental error due to the chemical analysis of sample increases with the decreasing ratio ofC_a/C_s. To obtain accuratediffusion coefficients by the use of this simplified equation, the experimental condition should be controlled so that the ratio ofC_a/C_sis in the range from 0.4 to 0.6. Results obtained are summerized as follows:
1) The diffusion data fit the following Arrhenius type equations; for sulfurD_c=2.0×10^-2exp (-14, 500/RT) cm²/sec
Q=14.5±1.4kcal/mole
for seleniumD_c=4.0×10^-3exp (-11, 900/RT) cm²/sec
Q=11.9±1.6kcal/mole
for telluriumD_c=3.4×10^-3exp (-12, 800/RT) cm²/sec
Q=12.8±2.3kcal/mole
2) The diffusivity increases (DS>DSe>DTe) with the decreasing radius of diffusing particle (rs<rse<rTe).

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lon exchange resin was generally used for the recovery of urqnium from its filte red pregnqnt liquor especially for the selective extraction of uranium from uranium bearing solution.
Later, however, ion exchange process has become to be used for the treatment of unfiltered slurry, one of the famous example being RIP process.
In this paper, a new method of apllication of ion exchauge resin for unfiltered slurry is described.
The slurry was prepared by removing sands only through 150 mesh screen, which was a very simple operation compared for filtering. A special ion exchange equipment was constructed. The contactor of this equipment consists of a cylindrical shell, and pregnant slurry is fed into contactor through distributor from its bottom, and ion exchange resin is fed from feeder.
Barren slurry overflows, which resin is retained in the contactor by 50 mesh screen.
Rake in contactor is slowly rotating as uniformly as contacting can be completely atained.
For example, when flowrate of slurry is 0.14-0.18l./l. resin/min., and 1/10-1/15 of resin in contactor is alternated through out, recovery of uranium from slurry is above 95% under the condition of U308 13-15g/l. resin.

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