24 GRAVEL AND PLACER MINING IN ALASKA. [bull. 263. 
If steain shovel is used — 
Length of boom. 
Weight of machine. 
On track or skids. 
Height of bank on which it will operate. 
Does it clean bed rock, or do men clean bed rock after it? 
Efficiency in digging the material at hand. 
Does it dump into cars or sluice boxes? 
Is conveying system equal in capacity to shovel? 
Difficulties encountered. 
Cost per cubic yard of digging. 
Elevation to which gravel is hoisted in cars, power necessary for hoisting. 
Describe track system for returning empty cars. 
If more than one of the above systems is in use for working open cuts on the same 
claim, give comparative efficiency and cost. 
Form 5 — Drift mining. 
Dimensions of shaft. 
Cost and rate of sinking per foot. 
Is shaft timbered? 
Method of timbering shaft. 
Depth of shaft to bed rock. 
Unfrozen gravel — 
Method of drifting. 
What width of face is carried? 
Are pillars left, what dimensions? 
Height of posts, length of caps. 
Are false sets used? 
Method of filling or caving worked-out ground. 
Are timbers recovered? 
Frozen gravel — 
Rate and cost of sinking shaft by steam point. 
Diameter of steam pipe entering shaft. 
Length, diameter, and cost of points. 
Pressure of steam, size of cross-head. 
How far apart are points placed in face? 
Is hot water used in starting points? Preference. 
Horsepower per point. 
How long are points left in face? 
Cubic yards of gravel thawed by each point in given time. 
System of mining and hoisting. 
If gravel thawed by hot-water hydraulicking, describe method. 
Size, capacity, and cost of pump. 
Position of pump. 
Temperature of and method of heating water. 
Amount of water used. 
Size nozzle used. 
Cubic yards of gravel thawed per shift, 
Boiler — kind, make, cost. 
Kind, amount, cost of fuel burned per day. 
Distribution of power, to thawing, to hoisting and conveying. 
If gravel thawed by wood fires, describe method; give cost and capacity. 
Describe system of tramming, wheeling, or skidding to shaft. 
Describe system of hoisting. 
Is self-dumping carrier used? Kind, efficiency. 
