. Transactions. re may be some fairly richconcentrations of gold within the drift itself wherever contemporarystreams had their courses during the deposition of this material and itfollows that any later stream cutting out and re-washing this drift doeslittle more than concentrate an equal volume of country rock, except-ing where it may cut into some such concentration of values. Thereappears to be some evidence that Pine Creek has cut some earlierconcentrations other than its own bench or former stream gravels, andthe yellow gravels. On the south bank of Pine near Discovery there are pay grav
. Transactions. re may be some fairly richconcentrations of gold within the drift itself wherever contemporarystreams had their courses during the deposition of this material and itfollows that any later stream cutting out and re-washing this drift doeslittle more than concentrate an equal volume of country rock, except-ing where it may cut into some such concentration of values. Thereappears to be some evidence that Pine Creek has cut some earlierconcentrations other than its own bench or former stream gravels, andthe yellow gravels. On the south bank of Pine near Discovery there are pay gravelswhich, from the present contour of the surface, do not appear tounderlie any stream bed more recent than the deposition of the drift,and these are not yellow gravels. It will be seen that in these wide flat valleys the streams are notnow actively concentrating gold from the mountains about them, andthat wherever the present small troughs of these streams traverse the Characteristus of the At/in Gold Field. 29. 30 The Canadian Mining Institute. unassorted drift they are not likely to have gathered much their richness depends upon their cutting some earlier con-centrations which may be in the drift material itself but is more oftenthe pre-glacial yellow gravel. This deposit as already stated exists atabout the level of the present stream beds. The portions of Pine and Spruce creeks now being productivelyworked coincide with portions of these yellow gravels which have beenat these places more or less cut into and re-sorted. That is fromDiscovery to 140 below on Spruce; and from Gold Run to Stephen-dyke on Pine. If the gold is derived in this manner it follows thatthe bench gravels or former courses of Pine and Spruce will not befound to be rich, excepting in such cases as Willow Creek andStephendyke where the earlier courses are themselves below the bed-rock of the yellow gravels and have received enrichment from horizons above the older deposit, the earUer s
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