Specifications

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
Finished: August 24, 1940
Ran last: June 1953

Dredge Cost
$297,304.62 – Dredge only

Engines cost
$47,681.00 – Engines only

Dredge camp cost
$16,828.19 – Including power plant

Labor, 1940
$45,259.35 – To build dredge

Equipment
$21,301.11 – Cat, dragline, etc.

Total cost
$428,304.27

Total weight
1,976,250 lbs, or 988.125 tons

Type
Self-powered, floating bucketline, California

Powered by
Two lngersol-Rand diesel electric units
Weight: 81,250 Ibs. with std. equip.
HP sea level: 450
HP at 6000 ft: 347
No. cylinders: 7 each
Bore: 10.5 inch
Stroke: 12 inch stroke
RPM: 600
Consumption: 600 gallons per day, 25 gallons per hour, .41 gallons per minute
Day tanks: 2 tanks, 150 gallons each
Main tanks: 18,000 gallons, total

Alternators
Make: General Electric
Voltage: 440 volts or 2300 volts
Size: 243 KVA

Exciter
Type: Direct current
Voltage: 125
RPM: 1750

Hull dimension
Length: 112.5 feet
Width: 54 feet
Height: 64 feet
Draft: 8 feet approx.

Pontoons
Number: 25
Size: 10 x 10 x 27 feet
Weight: 25,500 pounds approx.
Color: Top-red lead, bottom-black

Spud data
Number: One, starboard side
Length: 55 feet
Cross section: 34″ x 56″
Weight: 35,000 pounds or 17.5 ton

Ladder data
Length: 85 feet
Type: Enclosed box
Digging depth: 35 feet 37 after flooding front pontoons
Digging height: 6 feet above water line

Ladder hoist
Type: Double drum, automatic brake
Power: 100 hp electric motor

Bucketline data
Number: 72 when starting 71 shortly after starting
Bucket weight: 2300 to 2600 pounds each
Capacity: 8 cu. ft.
Speed: 26 per minute
Capacity: 7000 cubic yards per day 290 cubic yards per hours
Type: 2-web, cast, two bolt lips

Bucket lips
Material: Manganese steel
Weight: 356 Ibs.
Replaced: One year approx.

Bucket pins
Type: Single lug
Diameter: 5.5 inches
Weight: 197 pounds

Lower tumbler
Shape: Round
Weight: 14,000 Ibs., or 7 ton

Upper tumbler
Shaft size: 16 inches
Shape: Six-sided
Height: 30 feet above deck

Tumbler drive
Type: Single gear, port side
Bull gear: 12 foot diameter
Gears: Triple reduction
Power: 200 hp _electric motor

Trammel
Type: Rotary screen
Length: 29 feet,S inches
Diameter: 7 feet, inside measure
Weight: 585 Ibs. per plate
Hole size: 3/8 inch tapered
Hole size: 5/8 inch tapered, last section
Material: Manganese steel
Power: 50 hp electric motor
Speed: 15 to 20 rpm approx.

Stacker
Length: 90 feet originally
Length: 105 feet after February 1941
Width: 42 inch rubber belt
Power: 25 hp electric motor

Tables
Number of sluices: 16 each side, 32 total
Sluice size: 20 inches wide, 20 feet long
Total area: 1066.6 square feet
Riffle type: Hungarian riffle
Silver plates: 26 plates, 20″ x 22″
Total area: 79.5 square feet
Mercury traps: 1248, 1/2″ x 1/2″ x 2″ puddles

Main pumps
Screen: 75 hp, 3,600 gpm, 60 foot head
Hopper: 40 hp, 1,200 gpm, 90 foot head
Table: 40 hp, 3,600 gpm, 35 foot head

Swing winch
Size: Six drum, extra heavy
Controls: Two speed hi-low, hydraulic
Power: 40 hp electric motor
Lines: 1-1/8 inch cable

Crew & wages (for 3 shifts)
3 winchmen
1940: $0.875
1941: $0.875
1946: $1.05
1950: $1.25

3 bow oilers
1940: $0.725
1941: $0.725
1946: $0.95
1950: $1.15

3 stern oilers
1940: $0.625
1941: $0.625
1946: $0.85
1950: $1.05

1 shareman
1940: $1.00
1941: $0.95
1946: $0.95
1950: $1.??

1 shopman
1940: $0.80
1941: $0.80
1946: $???
1950: $???

1 dredgemaster
1940: $1.25
1941: $1.25
1946: $1.11
1950: $???

Buzzer signals
1 long, 1 short: Stepping ahead
1 long: Stop
2 long: Start
3 long: Bow oiler to winch room
4 long: Stern oiler to winch room
1 extra long: Big rock coming through
5 short: Bow oiler to front deck