Risk in mining investments.
in valuation of mines.
Roadways, protecting in shrinkage-stoping.
Rod-driven pumps.
Rotary steam-pumps.
Round vertical shafts.
Runs of value.
test-treatment.

Safety, factor of, in calculating averages of samples.
Sample, assay of.
average value.
narrow, diluting to a stoping width.
sections.
taking, physical details.
manner of taking.
Sampling.
accuracy.
percentage of error in estimates from.
precautions against fraud.
Saving of fixed charges.
Secondary alteration.
enrichment.
Security of investment.
Self-dumping skip.
Sets.
Shafts.
arrangement for very deep inclined shafts.
compartments.
different depths.
haulage.
location.
number.
output capacity.
shape.
size.
Shrinkage-stope.
-stoping.
advantages.
disadvantages.
when applicable.
Silver deposits.
deposits, enrichment.
prices.
Sinking, speed.
Size of deposit.
Skill, effect on production cost.
Skips.
balanced.
haulage in vertical shaft.
Sollars.
Solubility of minerals.
Specific volume of ores.
Speculative values of metal mine.
value of mine.
Spelter, annual demand.
Square-set.
-set timbering.
Stations.
arrangement for skip haulage in vertical shaft.
Steam-pumps, direct.
Steepening winzes and ore passes.
Stope filled with broken ore.
minimum width.
Stoping.
contract systems.
Storing metal.
Structural character of deposit.
Structure of deposit.
Stull and waste pillars.
support with waste reenforcement.
-supported stope.
Stulls.
wood.
Subheading.
Sublevel caving system.
Subsidiary development.
Superficial enrichment.
Supplies, general technical data.
Support by pillars of ore.
Supporting excavation.
Surveys.
Suspense charges.

Test parcels.
sections.
-treatment runs.
Timber, cost.
Timbered shaft design.
Timbering.
Tin, annual demand.
deposits.
ore, migration and enrichment.
Tools.
Top slicing.
Tracks.
Transport in stopes.
Tunnel entry.
feet paid for in 10 years.
size.

Underhand stopes.
Uppers.

Valuation, mine.
of lode mines.
mines, risk in.
mines with little or no ore in sight.
on second-hand data.
Value, average, of samples.
discrepancy between estimated and actual.
distribution.
of extension in depth, estimating.
positive, of metal mine.
present, of an annual dividend.
of $1 or L1, payable in -- years.
runs of.
speculative, of metal mine.
Valu