Sir: We appreciate the opportunity to further discuss the findings of our recent paper in Economic Geology (Mathur et al., 2002). The above comment focuses on two major issues: (1) the interpretation of combined Re-Os data and field observations as an indication of a basinal brine source for the magnetite deposits, and (2) the age of mineralization. The response below discusses geologic field evidence and isotopic information from the rocks and minerals to further explain the ideas of the original manuscript.

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First we will address the concern with the basinal brine model. Essential variables in the basinal brine...

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