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In the first part of this paper, the following three aspects of wall-rock alteration around the Fukazawa deposits in the Hokuroku district of Japan are discussed: (1) the existence of an Na 2 O-depleted dacite mass with a lateral dimension of 1.5 X 3.0 km immediately below the ore horizon; (2) the spatial zoning of alteration minerals in the hanging-wall and footwall rocks; and (3) the relative mobilities of the major elements during alteration of the footwall dacite.

In the second part of this paper, an example of the application of computers in the statistical treatment of physical and chemical data of wall rocks around the Ezuri deposits is presented, and the potential of the method in exploration of the Kuroko deposits is discussed.

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