102 



The gulch gravels occupy the upper portions of the 

 main creek valleys and small tributary valleys, and differ 

 from the creek gravels in being coarser and more angular. 

 A considerable portion of their material consists of almost 

 unworn fragments of schist washed down from the adjacent 

 slopes. They contain the same vegetable and animal 

 remains as the creek gravels. 



The only river gravels of the district proven, so far, 

 to contain gold in paying quantities, occur in the wide flats 

 bordering the lower portion of Klondike river below the 

 mouth of Hunker creek. The river gravels consist of 

 quartzite, slate, chert, granite and diabase pebbles, which 

 are harder and more rounded than the creek gravels, as 

 a result of the greater distance travelled. 



Rock terraces cut into the steep slopes of the present 

 valleys occur at different points. They were produced 

 during the deepening of the valleys, and are simply rem- 

 nants of former valley bottoms. They are small, seldom 

 exceeding a few yards or metres in width, and a few hundred 

 yards in length. They are also irregular in distribution, 

 and occur at all elevations up to the bottoms of the old 

 valleys. The terraces are beds of gravel, usually from 6 to 

 15 feet (1 .8 to 3.6 ,m) in thickness, very similar to that in 

 the creek bottoms, but showing somewhat more wear. The 

 terrace gravels, like the creek gravels, are overlaid as a 

 rule, with muck, and at one point on Hunker creek, were 

 found buried beneath a hundred feet of this material 



High level gravels are extensively distributed along 

 Bonanza and Hunker creeks and some of their tributaries, 

 and also occur on Eldorado, Bear, Quartz, Ninemile, and 

 Allgold creeks. They consist principally of ancient creek 

 deposits, overlaid near the mouths of some of the valleys 

 by gravels laid down by Klondike river, when it ran at a 

 much higher level than at present, and occupied a some- 

 what wider valley. 



High level river gravels occur at various points along 

 Klondike river, and in most places are found at elevations 

 of 200 to 300 feet (60 to 90 m.) above the valley flats. 

 These gravels differ altogether in character and appearance 

 from the White Channel gravels of the creeks. The pebbles 

 are smaller and more rounded, and consist mainly of slate, 

 diorite and quartzite, derived, like those of the present 

 stream gravels, from the mountains of the Ogilvie range. 

 The Klondike gravels as a rule have only a small gold con- 

 tent, but below the mouth of Bonanza creek, they have 



