The gold may occur on a foot-wall (of a block), on a hanging-wall, or right across in even value, and the appearance of the stone is little guide to its quality. A block has never been barren throughout, but the good blocks are more uniform in value, and the inferior blocks more patchy. Some very good gold was taken from the foot-wall seam of a block in No. 8 level. Its habit is illustrated in fig. 7. Keep It Dark Mine.—This lies to the south of the last, and its vein is practically a continuation of it, though there a. Seam of gold. b. Seams of pyrite. is evidence of a patch of barren ground between the two. This one also dips to the west for the most part, though with much irregularity, and with local changes in strike. Like the Wealth, it lies steeper (practically vertical) in the deep levels. It contains a number of blocks which vary in width, and are generally short. They wedge out very quickly, passing into mullock or “formation.” The accompanying figure (8) illustrates this change: Fig. 7.—Occurrence of Gold, Wealth of Nations Mine. Fig. 8.—Plan of Quartz Block, Keep it Dark Mine. The blocks pitch to the north and are similar in all respects to those in the Wealth. The gold is free and generally fine, and the ore is poorer in the deeper levels. Auriferous pyrite runs generally in seams and strings through the ore. Stibnite occurs in patches throughout the mine, sometimes accompanying good gold, sometimes the reverse. As a rule, the gold is evenly distributed, though sometimes it clings to the walls of blocks. In the accompanying section of a face at the north end of No. 7 level good visible gold occurred right across, quite independent of the nature of the stone. It is generally found that coarse gold indicates good ore; where the gold is not visible the ore is poor. Fig. 9.—Section of Face, Keep it Dark Mine. a Walls b. Pug seams. c. Seamy ore. d. White glassy ore.