Ani mine, situated in the so-called Green Tuff belt of Northeast Japan, is vein-type copper mine. On the basis of studies of geologic structure, mode of occurrence of ores and results of induced polarization, blind ore deposits have been found at the Inari Adit area. Procedures of the successful prospecting were described in this paper.
Important guidelines through the prospecting works are as follows:
1) Nature and shape of basaltic rocks. Copper bonanzas in these veins are found at extensions of sheet and dike of the basaltic rocks in some occasions.
2) Frequency effect anomalies to indicate areas of mineralization and hydrothermal alteration.
3) Resistivity values to indicate shape of trachy-andesite. A funnel shape was figured out on the trachy-andesite with the resistivity analyses. Well fractured zone was presumed at the margin of this intrusive body; then some veins were found.
Procedures above mentioned and later exploratory adit works were able to detect several new copper veins at depth of the Inari Adit area, where un-mineralized lava flows of trachyandesite and dacite crop out.
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