mines.
Demand for metals.
Departmental dissection of expenditures.
Deposits, _in situ_.
ore, classes.
regularity.
size.
structure.
Depth of exhaustion.
Determination of average metal contents of ore.
Development in early prospecting stage.
in neighboring mines.
of mines.
Diamond-drilling.
Diluting narrow samples to a stoping width.
Dip.
Direct-acting steam-pumps.
Distribution of values.
Dividend, annual, present value.
Dommeiler.
Down holes.
Drainage.
comparison of different systems.
systems.
Drifts.
Drill, requirements.
Drilling.
Drives.
Dry walling with timber caps.

Efficiency, factors of.
of mass.
Electrical haulage.
pumps.
Electricity for drills.
Engine, size for winding appliances.
Engineer, mining, as executive.
Engineering projects, phases of.
Enrichment.
at cross-veins.
Entry, to mine.
to vertical or horizontal deposits.
Equipment, cost.
improvements.
mechanical.
Erosion.
Error, percentage in estimates from sampling.
Escape.
Examination of mining property.
Excavation, supporting.
Exhaustion, depth.
Expenditures, departmental dissection.
mine.
Extension in depth.

Factor of safety in calculating averages of samples.
Filling.
system combined with square-setting.
with broken ore subsequently withdrawn.
waste.
Fissure veins.
Fissuring.
depth.
Fixed charges.
Flat-back stope.
Flexibility in drainage system.
Floors.
Folding.
Foot-drilled system of contract work.
-hole system of contract work.
of advance system of contract work.
value.
Fraud, precautions against in sampling.

General expenses.
Gold deposits.
deposits, alteration.
enrichment.

Hammer type of drill.
Hand-drilling.
-trucking.
Haulage, electrical.
equipment in shaft.
mechanical.
Hole system of contract work.
Horizons of ore-deposits.
Horizontal deposits, entry.
stope.
filled with waste.
Hydraulic pumps.

Impregnation deposits.
Inch, assay.
Inclined deposits to be worked from outcrop or near it.
deposits which must be attacked in depth.
shaft.
Inclines.
capacity.
Infiltration type of deposits.
Intelligence as factor of skill.
Interest calculations in mine valuation.
Intervals, level.
Inwood's tables.
Iron hat.
leaching.
Ivanhoe mine, West Australia.

Kibble.

Labor, general technical data.
handling.
unions.
Lateral underground transport.
Le Roi mine.
Lead, annual demand.
deposits.
enriching.
prices, 18