The writers discuss the state of the flowage of the hot springs which flow out from the gold-quartz veins in the Tertiary formations of Japan.
The hot water ascends along the vein fractures from the centers of activity. The temperature of hot water and the height of the orifices or of the stopped levels of the ascending hot water rise towards the centers of activity.
We can assume that the hot springs in underground passage fulfill approximately the Bernoulli's equation. We also apply the Darcy's law to the secondary flowage due to the difference in the height of the stopped levels of the ascending hot water as described above.
It is noticed that the hot springs occurring in these gold-quartz veins are muriated bitter ones in the chemical properties. In the Izu peninsula, the distribution of hot springs of this kind is limited, like that of the gold-quartz veins, to the area of the Yugashima group of the middle or lower Miocene epoch. It can not be decided whether the activity of these hot springs is genetically related to the formation of the gold-quartz veins, i. e. the late igneous activity of the Tertiary period, or they only ascend along the deeply-extended fractures in the basement complex of this district represented by the gold-quartz veins.

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The geology of this mine is compossed of Tertiary Green tuff, Tuff breccia, propylite and Dolerite being covered by Quarternary volcanic pyroclastic formations. The ore deposits are fissure filling Au-Ag bearing quartz vein in the Miocene formation called Yugashima series.
The volume of the underground water is 40m³/min, drained spontaneously from the lowest gallery, 30m level, of the mine and the volume above mentioned is almost constant through the year having no direct relation to the clinrate and seasons.
The water comes out mainly from north and south end of the lowest gallery. The origine of the water is pressumed fissure filling water supplied from the Quarternary pyroclastics which cover the Tertiary formations.
As its characteristics, the water indicates weak alkali, has the Electrical specific resistance high at south and low at north side of the gallery, and amount of the solvent oxygen is very few.

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At the Yanahara Mine, a huge are body has been discovered in the depth of 400m, as a result of the systematic prospecting from underground and surface.
But unfortunately on the surface, there is the river Yoshii, one of the three largest rivers in Okayama prefecture, this may cause the mine water to increase gradually as development progress. In addition, mine water must be entirely pumped up from the bottom of the are body several hundred meters below the surface, and the water flowing down through the goof is highly oxidized, so that the neutralizing treatment of this water is very expensive. Besides there may be a danger of mine inundations due to an unexpected underground flood like Kawarayamuki explorative drift, where the flood about 8m³/min happend in April, 1960.
It is very important to find the source of the mine water and to prevent the mine inundations. For this purpose, we have researched into the water problem for these several years, though we cannot get any conclusion yet.

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Makimine Mine, Miyazaki Prefecture, works the bedded cupriferous iron sulphidedeposit occured in the black phyllitic formation of the Shimanto Complex. When the underground developments approached the dike of granite porphyry, intruded north of the deposits, the faults bearing the water of high pressure appeared.
These faults are parallel with the dike of granite porphyy, and give little displacement to the deposits, and have the sheared zone of 1 m. in width.
The underground water of these faults has no special chemical component, volume of 4m³/min and pressure of 35-50kg/cm², and has prevented the underground mine-developments.
For shielding the underground water, cement grouting was effective.

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The main working faces are located in the thermal waterzone and there are much spout in the underground. The spout is thermal water which highest temperature is 67 digree (C). Recent average amount of drainage and actual coal production in the underground warking faces:
1955 1956 1957 1958 1959 1960
84.3m³/min 82.2 88.1 98.5 97.8 94.5
1, 228, 503t 1, 466, 800t 1, 543, 600t 1, 355, 900t 1, 226, 400t 1, 446, 100t
The great spout over 1 cubic meter per minutes 64 times. The most important thing for coal production, in this mine is to take necessary measure to meet this situation. After those miserable experience, we reached the conclusion to undertake large scale drainage, to make water-level lower and to make water pressure lower by which we can work absolutely safely. In the study of geological stractures and chemical characters of the thermal water in the laban Iwaki coal mine, it become clear that source of the thermal water comes frome the seepage water, fossil water and magamatic water.

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The Ube coal mine is developing the submarine coal seams belonging to the Tertiary formations. The coal field is divided into two areas by the Tsubuta fault, which runs nearly parallel to the shoreline under the sea bottom.
The underground water in the inside area which is cut by the Tsubuta fault, i. e. the area adjoining to the land is sea water type, which the water in the outside area is special type rich in HCO₃.
The highly-pressed water flowing in the stratum above the coal seam somtimes breaks the roof of the working-face, which is protected by the draining bore-hole.

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