The alteration of the country rocks that is associated with the Tertiary mineralization in the Wau-Edie Creek area, New Guinea's principal gold-mining district, possesses certain peculiar features. The porphyries and phyllites of the district have been more or less uniformly altered over a considerable area, corresponding closely to the limits within which the small quartz-gold stringers occur, whence have been derived the rich alluvials of Edie Creek and the adjacent streams. The larger lodes of the district are directly accompanied by only comparatively slight metasomatic effects. An outline is given of the geology of the area, and a brief description of the four principal types of lodes, after which the general and the local metasomatism are described.

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