DATE FOR THE YANKEE FORK GOLD DREDGE NO. 338 SERIAL NO. 16639,
SPECIFICATION #3261,
DRAWING #236,148
Built for
Snake River Mining Company
Subsidiary of Silas Mason Company, New York
Built by
Bucyrus-Erie Company
Ingersol-Rand Company
Olsen Manufacturing Company, Boise Idaho
Crew of the Snake River Mining Company
Date built
Started: April 1, 1940 (28)
Finished: August 24, 1940 (26)
Ran last: June 1953 (24)
Dredge Cost
$297,304.62 – Dredge only (37)
Engines cost
$47,681.00 – Engines only (37)
Dredge camp cost
$16,828.19 – Including power plant (37)
Labor, 1940
$45,259.35 – To build dredge (37)
Equipment
$21,301.11 – Cat, dragline, etc. (37)
Total cost
$428,304.27 (37)
Total weight
1,976,250 lbs, or 988.125 tons (3)
Type
Self-powered, floating bucketline, California
Powered by
Two lngersol-Rand diesel electric units (14)
Weight: 81,250 Ibs. with std. equip. (3)
HP sea level: 450 (14)
HP at 6000 ft: 347 (14)
No. cylinders: 7 each (14)
Bore: 10.5 inch (14)
Stroke: 12 inch stroke (14)
RPM: 600 (14)
Consumption: 600 gallons per day (27), 25 gallons per hour (27), .41 gallons per minute (27)
Day tanks: 2 tanks, 150 gallons each (3-15)
Main tanks: 18,000 gallons, total (17)
Alternators
Make: General Electric (14)
Voltage: 440 volts or 2300 volts (14)
Size: 243 KVA (14)
Exciter
Type: Direct current (14)
Voltage: 125 (14)
RPM: 1750 (14)
Hull dimension
Length: 112.5 feet (1)
Width: 54 feet (1)
Height: 64 feet (1)
Draft: 8 feet approx. (22)
Pontoons
Number: 25 (20)
Size: 10 x 10 x 27 feet (8)
Weight: 25,500 pounds approx. (8)
Color: Top-red lead, bottom-black (22)
Spud data
Number: One, starboard side
Length: 55 feet (1)
Cross section: 34″ x 56″ (1)
Weight: 35,000 pounds or 17.5 ton (8)
Ladder data
Length: 85 feet (3-1)
Type: Enclosed box
Digging depth: 35 feet (8) 37 after flooding front pontoons (23)
Digging height: 6 feet above water line (22)
Ladder hoist
Type: Double drum, automatic brake (8)
Power: 100 hp electric motor (8)
Bucketline data
Number: 72 when starting (1) 71 shortly after starting (22)
Bucket weight: 2300 to 2600 pounds each (4)
Capacity: 8 cu. ft. (8)
Speed: 26 per minute (8)
Capacity: 7000 cubic yards per day (25) 290 cubic yards per hours (27)
Type: 2-web, cast, two bolt lips
Bucket lips
Material: Manganese steel (8-6-7)
Weight: 356 Ibs. (7)
Replaced: One year approx. (22)
Bucket pins
Type: Single lug (19)
Diameter: 5.5 inches (19)
Weight: 197 pounds (19)
Lower tumbler
Shape: Round
Weight: 14,000 Ibs., or 7 ton (2)
Upper tumbler
Shaft size: 16 inches
Shape: Six-sided
Height: 30 feet above deck (1)
Tumbler drive
Type: Single gear, port side
Bull gear: 12 foot diameter
Gears: Triple reduction
Power: 200 hp _electric motor (8)
Trammel
Type: Rotary screen
Length: 29 feet,S inches (1)
Diameter: 7 feet, inside measure (1)
Weight: 585 Ibs. per plate (2·M)
Hole size: 3/8 inch tapered (8-9B)
Hole size: 5/8 inch tapered, last section (8)
Material: Manganese steel (9B)
Power: 50 hp electric motor (8)
Speed: 15 to 20 rpm approx. (22)
Stacker
Length: 90 feet originally (1)
Length: 105 feet after February 1941 (20-21)
Width: 42 inch rubber belt (8)
Power: 25 hp electric motor (8)
Tables
Number of sluices: 16 each side, 32 total (8)
Sluice size: 20 inches wide, 20 feet long
Total area: 1066.6 square feet
Riffle type: Hungarian riffle (8)
Silver plates: 26 plates, 20″ x 22″ (33)
Total area: 79.5 square feet (33)
Mercury traps: 1248, 1/2″ x 1/2″ x 2″ puddles
Main pumps
Screen: 75 hp, 3,600 gpm, 60 foot head (8)
Hopper: 40 hp, 1,200 gpm, 90 foot head (8)
Table: 40 hp, 3,600 gpm, 35 foot head (8)
Swing winch
Size: Six drum, extra heavy
Controls: Two speed hi-low, hydraulic
Power: 40 hp electric motor (10)
Lines: 1-1/8 inch cable
Crew & wages (for 3 shifts)
3 winchmen (34-35)
1940: $0.875
1941: $0.875
1946: $1.05
1950: $1.25
3 bow oilers (34-35)
1940: $0.725
1941: $0.725
1946: $0.95
1950: $1.15
3 stern oilers (34-35)
1940: $0.625
1941: $0.625
1946: $0.85
1950: $1.05
1 shareman (28)
1940: $1.00
1941: $0.95
1946: $0.95
1950: $1.??
1 shopman (28)
1940: $0.80
1941: $0.80
1946: $???
1950: $???
1 dredgemaster (28)
1940: $1.25
1941: $1.25
1946: $1.11
1950: $???
Buzzer signals
1 long, 1 short: Stepping ahead (29)
1 long: Stop (29)
2 long: Start (29)
3 long: Bow oiler to winch room (29)
4 long: Stern oiler to winch room (29)
1 extra long: Big rock coming through (29)
5 short: Bow oiler to front deck (29)