This paper is an account of the method and results of constructing vein contours for the purpose of visualizing vein deflections in space and cor-relating them with ore shoots. Such a correlation is shown to exist for the gold-bearing veins of the O'Brien Mine indicating that the position and attitude of sites favorable for late gold deposition were determined principally by vein attitude. Other structural features, such as vein intersections and folds, are shown to have had a strong localizing influence on the ore. The recognition, plotting and projection of these controls on vein contour sections are helpful in determining sites likely to be ore-bearing and so worthy of mine exploration.

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