EFA; J. Hot Spring Sci. 0* ,,ῌ-0 ,*+*

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Geochemical Inﬂuence of Drilling a New Hole
Adjacent to an Existing Hot Spring
Yasunori MORI+, Hideki YOSHIMURA+, Akira MAEDA+, Kyoko SHIMURA+,
Kazuyuki OHKUMA+, Masahiko OGAWA,, Kiyoshi HASHIZUME-,Seiichi NOHARA., Masaaki KONDO/ and Takamitsu KAJISA/

Abstract
During drilling a new bore-hole nearby an existing hot spring, Yunokuchi spa in
Kumano city, Mie Prefecture, the existing hot spring water was analyzed continuously
for investigation of geochemical inﬂuence by the drilling. The concentrations of chloride
and copper ions increased obviously accompanying the progress of drilling. It is estimated that the anomalous increases of these ions are derived from the mixing of natural
groundwater containing higher concentration of chloride and copper ions. It is demonstrated by natural ﬁeld observation that an existing hot spring is obviously inﬂuenced bya new drilling bore-hole close by. In the enforcement of The Hot spring law, it is thoughtthat the distance extent of geochemical inﬂuence observed in this study seems to be asigniﬁcant reference.
Key words : Yunokuchi spa, Kumano group, Drilling mud, Chloride ion, Copper ion+ /+,ῌ+,++   -02.ῌ++ + Mie Prefecture Health and Environment Research Institute, -02.ῌ++ Sakura-cho, Yokkaichi /+,ῌ+,++, Japan.
, /+.ῌ2/1*  !" +- , Mie Prefectural Government, Departmentof Environment and Forestry, +- Koumei-cho, Tsu /+.ῌ2/1*, Japan.
-#$%&'()$ /+*ῌ*-*.  *+,- -,/2 - Mie Prefecture Environmental Conservation Agency, -,/2 Ueno, Kawage-cho, Tsu /+*ῌ*-*., Japan.
../01%&2/  -*/ ῌ 2/*0 345678-9 +0 ῌ , . National Institute forEnvironmental Studies, +0ῌ, Onogawa, Tsukuba -*/ῌ2/*0, Japan.
/:;:;<=>?@;A  /+. ῌ 2/*1  BCD +/11 / Graduate School of
Bioresources, Mie University, +/11 Kurimamachiya-cho, Tsu /+.ῌ2/*1, Japan.

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ªN [6\71 MF&^NH¬­./:) ^N;Y¥VNMF&¬­()2®cy)H¯o°2±_;WXVN Y¥VN ¦ZVN&`a&²³C/:) DE´$opq2
st P) +,,.11 m ³cY¥VN µM +,,*,.*/ m ³cWXVN µM¶b +,-**.-* m ³cWXV
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and Energy, Ministry of International Trade and Industry, +313 ; Suzuki et al., +32,).

24

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Fig. , Geologic column of the part of Kumano group (Agency for Natural Resources and Energy,
Ministry of International Trade and Industry, +32*).

&'()*+,ῌ-./+,ῌ01456784923

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CationYKllmn>>oKpConcentration (mg/kg)

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Table + The major chemical composition of Yunokuchi spa (Analyzed Data in May, +33*)

# 

Li
Na
K
Mg,
Ca,
Sr,
Mn,

,4+
.1*4042
34*
-/+4.
.43
*4-

F
Cl
Br
HCO-
CO-,

,43
+-/1
.41
2143
*4-

 Water temperature .0.,
pH 1.2 Yield ,-* L/min.

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K 

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

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
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, 234 . 2,

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C6 : ,**0

2 2%,**1, 2, 1 526

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C6 : ,**1+* 2%,**2

0 2, 3 526

 : + _67 , `YZC6ῌ,-./0 ,[\]JO^1 bcd7Qefgh^ijOklmn,opTqre9s7<=W9$ YZC6῍,-./0 %/0a%/0@,[\]JO^1, 526,/0C6 @7Dteu,opTqre9s7<=W9$

-./01]O^vwOxyfzL{gPT|gL}7E9HIy~y]JyDQ~y]
JyyJO^/7QR<=>?9$ 9 /0,7>?9-.ST W u
X7E9$9 ,re9s [\]JO^:9SDQ T!?eSTUVW &E? ,*+*- 2US' uX7E9$,ῌ- ῒ ῑUVW9S,X"1 #seX & ,**,' 7W9
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 pH : ¨iv+©ª« : Sartorius PT-+*
Z#¬­ : ®Z#
Na, Ca, Mg, K :  ¯##

ª« : SHIMADZU AA-02**"M : Air-C,H, Kly°
% : HCl ±#F, Br, SO. : z²Oh~³L^iK

Z#ª« : DIONEX DX-+,*xi° : AS-+. &.(,/* mm' AG-+. &.(/* mm'"M : ´Plg´"M ASRS-** . mmµ¶ : -./ mmolῌL Na,CO-)+.* mmolῌL NaHCO- ,·% : *../ mm ¸O¹lOKºn]y»·
Cl : [yn-#¼ : +ῌ+*N AgNO½. /ῌ K,CrO.
26

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dc

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FW .,.3.../ pH W 1.22.+ bW ++*+.* Lῌmin. U ­7W®¯ dc
F°l±®tc
«®²r\XY³´µwI¶` c !· ®cr"¸fgh vw¹º-+ 

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»FacF\¼½` Fig. / 27         !" #$%& '()*+



Fig. - Temporal variation in ion concentrations in the hot spring-water from an existing
Yunokuchi spa (Observation period ῌ). Data Obtained before drilling a new bore-hole.

./012345 6789:;<=>5 *.+ mgῌkg ?4@ABCDEFG HIJKL8MINOC PQIRSCTGU6789:;<=VWXIYZ [\JKL8M0NO]^C\,_0`aTbc5 defgh@iZjCklUm\, JKL8M034NO5 n@ *.3 mgῌ
kg Godpm\,./@5qrstuv0wxy<z]{|CD}Z ~Nqr]efICD
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28

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Fig. . Drilling depth of a new bore-hole and temporal variation in ion concentrations in
the hot spring-water from an existing Yunokuchi spa (Observation period ῎). Drilling
depth is shown by a white bar graph.

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!

RRSMOW"+,*** ##########################ῌ
RSMOW

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

Fig. / Observed Zn concentrations at Yunokuchi spa. Dotted lines indicate the timeof exchange of air pipe containing Zn (Observation period ῍῎).

Fig. 0d+2O-dD-diagram of hot spring water from Yunokuchi spa.

dD-2 d+2O.+* ////////////////////////////////ῌ

34567 895:;ῌ<;=4>?@AB CDEF G5HIJ5KLMNHOPQ
RSM=4TONU VW MWL XMYZ[\]J^0 _5_`ab cdefghLij589
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]JO^ 1ῌ ,**320 B CDEF5M895S
v~M¡¢T £l¤|r@5}~M¥HO¦§x¨©|0
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30

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Fig. 1

Observed Cl concentrations at Yunokuchi spa during drilling at adjacent site (Observation period ῍).

!"#$%&'()*+,- +,-/* mgῌkg .,/01234-567$289: ;<!"#$=, > /** m ?@AB87 &'()*+, CD

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&'()*+,- abc`ῌ  % defabc`῍/ghῑ34-i6Ljk/l9: K8K2 7
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 dML- T Wῌῐp ¡UpKL ¢£ ¤῍#$ ¥¦ ,*** §¨©pK:«῎῍}¬eW­®#$LM

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31

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Table , Chemical compositions of
the drilling mud in this study

34567# ῌ 89:!"#;),-!"#:)< ῍ 89:)=!"#>) :?!)"%

Concentration (mg/kg)!"#*@# :#A6)<ClCu89:)$%BCD Table , !EF 89GH)I !"J$%&'()*+,-).D ῌ ):)<K

,*42
*4*++

 pH 3.1

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qQ7 $%&'(3*+,-eRO)K4567#
UR 89GHr7s! $%&'('(/89!/:>tuDEFO)) ;v\wx@'("<3=y67R fW:;A6z>Q7VA6O@{$%&'('(3,-ῌ:>D|J?eRXKA6 89GH!/}67@A[R :#~)>:)<3q e @?!
K@[RXK3EQ7# UR)

:#1!f;):3d2eVWRLM 89:3n2

!F#XK!"J $%&'(3"<D|J?eR2O4567#-. 



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Chijiwa, K. and Tomita, S. (+32+a) : Stratigraphic notes on the Kumano Group (A study of the
Tertiary Formations of the Kumano Coal-ﬁeld in the Kii Peninsula, Southwest Japan,
part +). Mem. Fac. Sci., Kyushu Univ., Ser. D, Geol., ,., +//ῌ+12.
Chijiwa, K. and Tomita, S. (+32+b) : Sedimentary Environments of the Main Part of the KumanoGroup (A study of the Tertiary Formations of the Kumano Coal-ﬁeld in the Kii Peninsula,Southwest Japan, part ,). Mem. Fac. Sci., Kyushu Univ., Ser. D, Geol., ,., ,2+ῌ,31.
Chijiwa, K. and Tomita, S. (+32/) : On the Onuma Formation of the Kumano Group (A studyof the Tertiary Formations of the Kumano Coal-ﬁeld in the Kii Peninsula, Southwest
Japan, part -). Mem. Fac. Sci., Kyushu Univ., Ser. D, Geol., ,/, ,2+ῌ,31.

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