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Research Article
ScienceAsia 29 (2003): 265-277 |doi: 10.2306/scienceasia1513-1874.2003.29.265
Geophysical Investigations at
Khao Nang Klu Lead Deposit, Ban Kli Ti,
Kanchanaburi, Western Thailand: Implications for
Tectonic Structures Ore Locallization and Exploration
Punya Charusiri1,*, Weerasak Lunwongsa1 and Preecha Laochu2
ABSTRACT: Kli Ti area in Thong Pha Phum District, Kanchanaburi was selected in an attempt to search for a
new and highly potential area of lead ores. On the basis of the proximity to the currently operated, low-grade
Pb mine, we discovered Khao Nang Klu as a very promising target area for this investigation. Ground
geophysical surveys were conducted using resistivity and induced polarization methods. The survey consisted
of six investigated lines with a total length of 7.6 km, comprising 1 base line and 5 traverse lines.There were
a total of 111 data points collected in the surveyed area characterized by steep-slope topography, and all the
data were processed and enhanced using the Surfer6 and related programs. Field investigation revealed that
the survey area is dominated by Ordovician limestones with the isoclinal folded strata whose major axis
aligns in the northwest direction. Some sulfide ores are locally present in a few outcrops and in the exploratory
trench. The geophysical result revealed 5 anomalous zones with the average thickness of 25 m and at the
average depth of about 20 m. Two linear zones viz. those of the northeast and northwest directions were
interesting for further detailed investigation. However, the northwest-trending geophysical anomalous zones
corresponding to those of the near-surface geochemical anomalies in the southwestern part of the study area,
were regarded as non-significant anomalies due to occurrence of discarded slags. The current investigation
advocated that the northeast-trending Pb sulfide ores and isolated Cu ores formed as irregular to lens-shaped
epigenetic bodies along the northeast-trending extensional fracture zones. Field investigation also revealed
that Pb ores may not be temporally and spatially related to Cu ores. The latter may have formed as a result
of ore fluids related closely with differentiation of I-type granitoids. Maximum stress developed as a result of tectonomagmatic interaction of the Western Burma block against the Shan Thai block may have caused open
fractures responsible for channel ways for Pb( Zn) ore precipitation in Ordovician carbonates.
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1 Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand.
2 Economic Geology Division, Department of Mineral Resources, Bangkok 10400, Thailand.
* Corresponding author, Email: cpunya@chula.ac.th
Received 5 Jul 2002, Accepted 4 Mar 2003
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