purington.] FOKMS SENT TO MINERS. 21 
Size, make, and cost of giant or giants used. 
Size nozzle used, with or without deflector. 
How often is giant moved ? 
What height of bank is operated on ? 
What modifications adopted in system of piping owing to frozen gravel? 
Does giant clean bed rock ? 
If not, how is bed rock cleaned ? 
How much gravel is moved per shift? 
If bankhead or by wash water used, how much ? 
How are bowlders handled, derricking or shooting? 
Cost of handling bowlders. 
Size, capacity, and cost of derrick and plant; cost to operate. 
At what distance is head box of tail sluice from giant? 
Dimensions, grade, and length of boxes in tail sluice. 
Number of boxes. 
Size of lumber in bottom, side, and lining boards. 
Method of making sluice box, size of posts and sills. 
Cost and time to make and put in place one box. 
Life of lining boards. 
Largest stones put through sluice. 
Average cost of shooting bed rock to keep*sluice on grade. » 
Kind of riffles employed in the sluice — distribution. 
Cost and life of same — preference of riffles. 
Amount of quicksilver used. 
Amount of quicksilver consumed. 
Are undercurrents used ? Description, number, distribution, area of each, grade, 
results. 
Per cent of gold saved in different parts of sluice. 
Per cent of gold saved in undercurrents. 
Per cent of gold lost. 
Is gravel forked in the sluice ? 
Is dump moved after leaving end sluice box ? 
If so, by what power and to what distance ? 
Are tailings impounded? If so, for what reason? 
Method and cost of impounding. 
Cost of breaking down, moving, and washing gravel per cubic yard. 
Improvements contemplated or suggested. 
If hydraulic elevator is used — make, size, weight, and cost of elevator-. 
Depth of sump. 
Effective lift of elevator. 
Pressure necessary to obtain lift. 
Size of throat, upcast pipe, and nozzle. 
Weight, thickness, material, life, and cost of throat. 
Method of joining upcast pipe. 
Shape, material, and life of hood. 
Largest stones handled. 
Amount of water handled by elevator. 
Amount of gravel handled by elevator. 
Amount of water fed to nozzle. 
Are auxiliary water lifts used? 
Is any method beside piping used for feeding gravel to elevator? What method. 
Describe sluice boxes before elevator, if any — number of boxes, grade, dimensions, 
riffles. 
1 Describe tail sluice — length, grade, dimensions, riffles. 
