670 IDAHO MINING DISTRICTS. 



headwaters at Summit Flat. Only two tributaries join it Clear 

 Creek, heading in the rugged mountains near Wilson Peak, and 

 Muddy Creek, heading a few miles northwest of Pioneerville. 



Present stream gravels. A large amount of tailings lies nearly all 

 along Grimes Creek. At Centerville they are 900 feet wide ; farther 

 up they narrow considerably, where the hills approach closer to the 

 creek, to widen again near Pioneerville; above this place the creek 

 enters a rather narrow canyon. A great mass of tailings also lies in 

 Muddy Creek. Clear Creek has never been washed, and the original 

 wide alluvial grassy flats are here preserved in the lower course of 

 the creek. Concerning the gold content of these tailings, the same 

 remarks apply here which were made in relation to those of Moore 

 Creek. They can doubtless be worked profitably in many places by 

 means of hydraulic elevators or dredges. The difficulty is to obtain 

 a sufficient water supply. The beds of Grimes Creek and Muddy Creek 

 are reported to have been rich throughout, while Clear Creek did not 

 pay well. Only a few of the side gulches contained gold in paying 

 quantities. Willow Creek was rich, and contained near its head a body 

 of angular gravel, known as Channel's claim, which has yielded much 

 gold. Henry Creek, leading up to Summit mine, was also rich. The 

 bulk of the gold appears to have come down from the headwaters of 

 Grimes and Muddy Creeks. 



The tailings are very sandy, being composed of almost 60 per cent 

 sand and 40 per cent cobbles, and the maximum depth is 15 to 20 feet. 

 The lower part of the tailings and benches of Grimes Creek, up to 3 

 miles below Centerville, is owned by the Grimes Creek Bed Rock 

 Flume Company ; the upper part, as far as several miles above Pio- 

 neerville, by the Wilson Company, which for many years has carried 

 on active operations near Pioneerville. The creek has been worked 

 as far up as the big bend at Grimes Pass, where the gravel is charac- 

 terized by a great many heavy bowlders of porphyrite. Many similar 

 cobbles of porphyries also occur farther down on Muddy and Grimes 

 creeks. Pebbles of obsidian have been found on Muddy Creek. 



Bench gravels. As along Moore Creek, gravel benches occur at 

 different elevations all along Grimes Creek. The two most prominent 

 benches are at elevations of 30 and 60 feet above the present creek 

 bed, but scattered gravel occurs at higher elevations also. Such is 

 the thin gravel occurring near Centerville up to 150 feet above the 

 creek. These bench gravels have been very extensively worked, and 

 but little remains of them near Centerville. A short distance above 

 Centerville, at a place called Bummer Hill, they were of unusual 

 richness. Above the narrow canyon the bench gravels appear again 

 in the open valley; where Muddy, Clear, and Grimes creeks join the 

 same kind of benches are noted and hydraulic work has been actively 

 prosecuted. Pioneerville is situated on the lower bench, 25 feet 

 above the creek. A low bench gravel, one-half mile above town, 



