PUEINGTON.] 
DKKDUINO. 
169 
It would therefore be fair to call the extraction 75. IS per cent of the prospect 
value, which is the average of the two methods of computation above referred to. 
During the year just ended, Biggs No. 1 dredged LI. 85 acres, handling 493, 150 
cubic- yards, which yielded a gross bullion return of $60,738.52, or an average yield of 
12.32 cents per cubic yard, as compared with a gross bullion return of f>36,525.25, 
or an average yield of 8.45 cents per cubic yard for 1908. 
Costs. — The operating cost has been 5.62 cents per cubic yard, and the total cost, 
including all improvements, repairs, taxes, insurance, legal, office, and other 
expenses (excepting Biggs No. 2 construction account), has amounted to 7.06 cents 
per cubic yard. 
Comparing the capacity of the dredge and the cost of operation for 1904 with 1903, 
the capacity has increased from 39,551 cubic yards per month to 41,090 cubic yards 
per month, while the cost of operation has decreased from 6.48 cents per cubic yard 
to 5.62 cents per cubic yard, and the total expense from 7.71 cents to 7.06 cents per 
cubic yard. 
The bullion yield has increased from 8.45 cents per cubic yard to 12.32 cents per 
cubic yard. 
Repairs. — Aside from the ordinary repairs on the dredge, a new revolving screen 
was installed at a cost of $1,600, and the 1-horsepower motor used for priming the 
water pumps and cleaning up was replaced by a 3-horsepower motor at a cost of 
$1: 
)5. 
Flame repairs. — During the floods last February 500 feet of the flume and trestle 
were washed away. The rebuilding of the flume and trestle and repairs at the pump 
station cost $357.40. 
Improvements. — The blacksmith shop equipment has been enlarged at a cost of 
$547.45 by installing a 5-horsepower motor, with transformer, a forge, blower, emery 
wheels, grindstone, and small drill press. 
Biggs No. 2 construction. — The hull of Biggs No. 2 is completed and the dredge was 
floated the first of the year. The contractors are now installing the machinery, and 
the dredge will probably be ready for operation about the middle of February, 1905. 
Bullion table. 
Month. 
January . . . 
February . . 
March 
April 
May 
June 
July 
August 
September 
October 
November. 
December . 
Cubic yards 
bank meas- 
urement 
dredged. 
Total oraver- 
20,840 
32, 000 
41,160 
50, 760 
47, 700 
40, 750 
44, 880 
89, 800 
41,600 
48, 460 
40,300 
46,400 
Bullion yield. 
493, 150 
$3, 120. 87 
3, 408. 59 
7, 732. 02 
9, 600. 10 
8, 072. 1 7 
3,704.36 
4,271.03 
4,27.°.. 81 
4, 265. 74 
4, 645. OS 
3, 874. 92 
4, 269. 73 
60, 738. 52 
Operating 
expenses. 
Yield per 
cubic 
yard. 
< Operating 
cost per 
cubic 
yard. 
$2, 077. 00 
2.205.07 
2,418.94 
1 , 854. 69 
2, 238. 4 1 
2,013.97 
2, 272. 30 
2,471.91 
2,392.09 
2, 620. S3 
2,340.96 
2,831.31 
< 'nils. 
15.38 
L0.65 
18. 78 
IS. 91 
10. 94 
9.09 
9. 62 
10.87 
10.2") 
9. 58 
S. 37 
9.20 
Ct tits. 
18. 10 
6. 89 
5. SS 
8. 65 
4.68 
4.94 
5. 12 
6. 29 
5. 75 
5. 40 
5. SI 
5.02 
27,832.5:; 
12.32 
5. 62 
Operating 
profit pei- 
cubic 
yard. 
Ct uls 
2, 
3. 
12. 
15. 
12. 
4. 
4. 
4. 
4. 
4. 
>> 
4. 
(i. 70 
