Naoshima is located in the Inland Sea of Japan about 120 miles west from Osaka and the old smelter was commenced 50 years ago. Over the years, the smelter has undergone many changes to increase production, improve the technology and reduce the operation cost.
In accordance with increase of copper consumption in Japan, Mitsubishi Metal Mining decided to construct the New Cooper Smelter and Refinery Complex with capacity of 7, 000 metric tons electrolytic Cu per month at Naoshima. The new complex was completed at the end of 1969, and the full production of 7, 000 metric tons was achieved March 1970.
This paper describes smelling and refining process, flow sheet, tonnage and assay of products. Particular emphases will be given to the partial roasting fluidized bed process for copper concentrate, the reverberatory furnace with deepbath operation to introduce hot calcine charge with Wagstaff Gun, side stream cell circulation system in the tank house and environmental qualities in the plant site. Plant design work was proceeded by Mitsubishi Metal Mining personnel.

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Some physical properties of Sanjome andesite and Aoishi sandy-tuff are measured before and after apply-ing repeated compressive or tensile load with mean stress of 35% and stress amplitude of 30% of static compre-ssive or tensile strength respectively, until 10₆cycles, and the difference of physical properties and the effects of the number of stress cycle on some mechanical properties are investigated.
For both rocks, the changes of specific gravity and porosity are relatively small, within the limit of accuracy of measurement, and it could be said that there is no influence of repeated compressive load on both properties, but from the shape of stress-strain curve of andesite there is a tendency of increasing of volume of clos-ing cracks with increasing the number of stress cycle.
Uniaxial compressive and tensile strengths remain constant after applying repeated load. This agrees with the suggestion that the fatigue failure of rock under repeated loading is a stochastic process.
There is no remarkable change of-the static stress-strain curve of both rocks by applying repeated tensile load, on the other hand, by applying repeated compressive load and in the range of small strain, static tangent Young's modulus of andesite decreases and Poisson's ratio increases from the early stage of repetition of load.
The distinct change ofP-wave velocity measured at the same direction as the loading direction in rock is not observed after applying repeated tensile load. When repeated compressive load is applied, the velocity in Aoishi sandytuff remains constant, while the velocity in Sanjome andesite increases.

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In earlier papers about the gas adsorption on coal, the authors have shown the heats of adsorption and the activation energies for diffusion in the range of temperatures 24-75°C.
In this paper, we carried out the mixed gas adsorption experiments in order to know if the atmosphere in mines might influence on the spontaneous combustion of coal.
We measured the amounts of gas adsorbed with gravimetric method.
From this work on the adsorption of oxygen-methane and nitrogen mixtures on coal, the results obtained are summerized as follows.
1) In the initial stage of adsorption, coal adsorbed much more amounts of oxygen with decreasing temperature.
2) The adsorption isotherms during 4 hours obeyed the Freundlich equation.
3) In the range of temperatures from 50 to 75°C, the oxidation of coal did not effect by methane composing the gas mixtures.
4) In mixed gas atmosphere, the gas adsorption process is different between at higher temperatures and atlower one. Namely, the former is controled by physical phenomena mainly, the latter is added to chemical reaction with considerable velocity.

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Many papers have appeared in which clay mineral data have been given in quantitative terms. In this paper are presented data on which is based the quantitative method currently being used by the writers.
The measurements most suitable for quantitative purpose were obtained from the ratio of peak intensities ofd(001) spacing of kaolinite and of montmorillonite which was treated with ethylene glycol.
The suspension method for the preparation of standard mixtures described here can be used for the quantitative analysis of kaolinite and montmorillonite with an excellent degree of accuracy. The kaolinite values obtained from the suspension method have 4.0 and 2.0% of deviations of 95% confidence limits within the ranges of 10-80% and 80-90% of kaolinite concentrations, respectively. It is supposed from those results that the proposed technique also promises to yield accurate analysis of clay mixtures of more than binary system. The detection limit was found to be 0.9% for kaolinite and 4.5% for montmorillonite with scintillation counter.

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The relation between floatability and formation of elemental sulphur by oxidation of pyrite in acidic solutions was investigated.
The results were summarized as follows: 1. Perfect floatability was obtained in pH values lower than 3, even in the case where only frother was used. This result was interpreted in terms of the increase of hydrophobicity of pyrite surfaces caused by the appreciable formation of elemental sulphur in acidic solution.
2. The deposition of elemental sulphur on pyrite surfaces in acidic solutions obeyed the logarithmic rate law as in the case of corrosion of metals.
3. Even for pyrite having a poor floatability, such as producet from Abuta mine in Hokkaido, perfect flotation was obtained without any collector, i. e. with frother alone, if the pH of solution was lowered to about 1.

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