Hunker Creek is a tributary of the Klondike into which it empties eight miles above the mouth of Bonanza. It heads close to the Dome, with Dominion Creek, and flows in a north-westerly direction. It has a length of fifteen miles, and is about equal in size to Bonanza Creek. The most important tributaries are Last Chance and Gold Bottom creeks, both of which come in from the left.

The gravels on Hunker Creek, like those on Bonanza Creek, are of four different kinds, the present creek-gravels, the terrace-gravels, the old valley-gravels and a sheet of river-gravel overlying the latter near the mouth of the valley. The creek-gravels are all local in origin, and are similar in character to the Bonanza Creek gravels. They consist of flat schistose pebbles, sub-angular quartz pebbles and boulders, and occasional pebbles derived from the newer eruptive rocks. They have a thickness of from four to ten feet, and are overlain by a bed of muck or peaty material ranging in thickness from about twenty feet downwards. At Discovery, the thickness of both muck and gravel is less than ten feet.

The terrace-gravels are more rounded than the creek-gravels, but are otherwise very similar. They have a maximum thickness of seventeen feet, and in places are of considerable economic importance. The old valley-gravels have a wider distribution along Hunker Creek than on any creek in the district.

Hunker Creek gold, like that of most of the other creeks, occurs in coarse, bulky grains, with occasional nuggets in the upper part of the valley, and in flatter and smaller grains lower down. In the rich stretch near Discovery claim nuggets are fairly numerous. The gold from about claim No. 45 below down to No. 59 below is generally superficially darkened by iron.

Gold Bottom and Last Chance creeks, the two principal tributaries of Hunker Creek, are both gold-bearing and have been worked to some extent for several miles above their mouths. A band of quartz-drift extends up Last Chance Creek, following the left limit, to No. 15 pup, a distance of two and a half miles, and is fairly rich in places. The gold obtained from the upper part of the band is very angular and is often crystalline.