MATANUSKA AND TALKEETNA BASINS. 123 
[t was built at a cost of about 60 cents per cubic yard. Owing to the 
isual inadequate water supply during the last third of the season, it is 
planned to build 12 miles of ditch to Summit Lake at the head of 
anyon Creek. This ditch, which is now partially built, is 5 feet 
wide at the top, 3 feet at the bottom, and 2 feet deep. A contract 
jrice of $2.50 per rod has been made, which is 10 cents cheaper than 
lie old ditch. Two giants fitted with 4-inch nozzles are used when an 
abundant supply of water is available. As the water falls, the size of 
he nozzle is reduced. A yardage of 1,000 cubic yards per day can be 
maintained at a reported working cost of 4 cents per yard. This 
Figure is exceptionally low, and probably can not be realized without 
most careful management. The gold-saving apparatus, which is 
adapted to the precipitous bluff upon which the bench is mined, is a 
combination of sluice boxes, grizzles, and undercurrents combined in 
in ingenious manner. A main sluice of four box lengths, with 1 1-inch 
*rade and fitted with riffles, is terminated by a steeply 'nclined grizzly 
3ver which large rocks pass to the dump. The grade of the grizzly is 
5 feet in 16 feet, and the bars are 4 h inches apart. Fitted beside the 
main sluice are two undercurrents fed by material passing through 
grizzly bars 3| feet long and 2\ inches apart. The undercurrents 
have a grade of 8 inches to 12 feet, are each 6 feet long by 3 feet wide, 
and are fitted with slot riffles. The material from the undercurrents 
passes by a small sluice to meet the material which falls through the 
large grizzly at the end of the main sluice, and with it runs down a 
second large sluice at right angles to the first. Undercurrents from 
the second sluice are arranged in a similar way to those above de- 
scribed. A third turn in the arrangement of the boxes brings the 
wash, now thoroughly cleaned, back to a point nearly beneath the large 
grizzly at the end of the first sluice. The arrangement is said to be 
very satisfactory. 
On Mills Creek, a tributary of Canyon Creek from the southeast, a 
small amount was produced. At one point drifting was carried on 
with reported success. 
On Cooper Creek, a tributary of Kenai River 2 miles below its 
source, benches carrying gold in commercial quantities are reported. 
Though no gold was produced the last season on Lynx Creek, a 
tributary of East Fork 8 miles above its junction with Sixmile Creek, 
development work of importance was completed. It is planned to 
work the gravels near the mouth of this creek by hydraulic methods. 
To reach bed rock and to avoid the thick deposit of coarse wash at the 
rii ^uth of the creek, upon which sufficient grade for a dump could not 
possi'Uy be secured, a 600-foot tunnel has been run through a sharp 
ridge, reaching a point where the valley of East Fork is lower than the 
bed-rock floor of Lynx Creek. The tunnel is 6 feet high by 5 feet 
