At the TAG mound (200 m x 45 m) on the Mid-Atlantic Ridge, 17 holes drilled to a maximum depth of 125 m indicated a bulk tonnage of 2.7 million tonnes of massive sulphide averaging 2 wt. per cent Cu and 1.2 million tonnes of stockwork mineralization at 1 wt. per cent Cu (Hannington et al., 1998).
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