Sir: We welcome the occasion to further clarify our model of seawater precipitation of the polymetallic sulfide layer in South China in the light of the criticism by Coveney (2003) and want to address the following five topics: depositional characteristics of the Ni-Mo-PGE-Au sulfide layer, Os isotopes, metal ratios, comparisons with Ni-Mo-PGE-Au mineralization in the Nick basin of Yukon, Canada, and enrichment factors in marine ore environments.

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The best stratigraphic descriptions on the position of the Ni-Mo ore layer are by Coveney et al. (1992, 1994), Lott et al. (1999), and by Steiner (2001), Steiner and...

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