To the engineer falls the work of creating from the dry bones of scientific fact the living body of industry. It is he whose intellect and direction bring to the world the comforts and necessities of daily need. Unlike the doctor, his is not the constant struggle to save the weak. Unlike the soldier, destruction is not his prime function. Unlike the lawyer, quarrels are not his daily bread. Engineering is the profession of creation and of construction, of stimulation of human effort and accomplishment.
INDEX.
Accounts, 169.
Administration, 161, 169, 178.
Administrative reports, 178.
Air-compression, 146.
-drills, 147.
Alteration, secondary, 24, 25, 26, 30.
Alternative shafts to inclined deposit, 63.
Amortization of capital and interest, 42.
Animals for underground transport, 134.
Annual demand for base metals, 38.
report, 179.
Artificial pillars, 121.
Assay foot, 10.
inch, 10.
of samples, 7.
Assaying, 177.
A value of mine, 56.
Bailing, 143.
Balance sheet, 179.
value of mine, 182.
Benches, 95.
Bend in combined shafts, 59.
Bins, 84.
Blocked-out ore, 18.
Blocks, 13.
Bonanzas, origin, 28.
Bonus systems, of work, 167.
Breaking ore, 115.
Broken Hill, levels, 119.
ore-pillars, 120.
Cable-ways, 135.
Cages, 132.
Calculation of averages, 1, 8.
of quantities of ore, 13.
Capital expenditure, 170.
Caving systems, 122.
Churn-drills, 92.
Chutes, loading, in vertical shaft, 86.
Classification of ore in sight, 13, 16.
Combined shaft, 58, 67, 68, 69, 70, 72.
Commercial value of projects, determination, 188.
Compartments for shaft, 76.
Compressed-air locomotives, 135.
-air pumps, 141.
vs. electricity for drills, 145.
Content, average metal, determining, 1.
metal, differences, 6.
Contract work, 165.
Copper, annual demand, 38.
deposits, 1.
ores, enrichment, 30.
Cost of entry into mine, 65.
of equipment, 156.
per foot of sinking, 64.
Crosscuts, 86.
Cross-section of inclined deposit which must be attacked in depth, 68.
showing auxiliary vertical outlet, 66.
Crouch, J. J., 145.
Cubic feet per ton of ore, 14, 15.
foot contents of block, 13.
Deep-level mines, 60.
Demand for metals, 35.
Departmental dissection of expenditures, 171.
Deposits, in situ, 1.
ore, classes, 24.
regularity, 88.
size, 30.
structure, 24.
Determination of average metal contents of ore, 3.
Development in early prospecting stage, 92.
Diamond-drilling, 93.
Diluting narrow samples to a stoping width, 11.
Dip, 89.
Direct-acting steam-pumps, 140.
Distribution of values, 30.
Dividend, annual, present value, 46.
Dommeiler, 145.
Down holes, 100.
Drainage 138.
comparison of different systems, 143.
systems, 140.
Drifts, 87.
Drill, requirements, 145.
Drives, 87.
Dry walling with timber caps, 91.
Efficiency, factors of, 162.
of mass, 162.
Electrical haulage, 135.
pumps, 141.
Electricity for drills, 145.
Engine, size for winding appliances, 131.
Engineer, mining, as executive, 190.
Engineering projects, phases of, 187.
at cross-veins, 24.
Entry, to mine, 58.
to vertical or horizontal deposits, 62, 63.
Equipment, cost, 156.
improvements, 152.
Error, percentage in estimates from sampling, 1, 11.
Escape, 73.
Examination of mining property, 54.
Excavation, supporting, 103.
Exhaustion, depth, 32.
Expenditures, departmental dissection, 171.
mine, 170.
Extension in depth, 21, 22, 28.
Factor of safety in calculating averages of samples, 12.
Filling, 112.
system combined with square-setting, 111.
with broken ore subsequently withdrawn, 112.
waste, 107.
Fissure veins, 24.
Fissuring, 23.
depth, 30.
Flat-back stope, 98, 100, 110.
Flexibility in drainage system, 138.
Floors, 31.
Folding, 23.
Foot-drilled system of contract work, 166.
-hole system of contract work, 166.
of advance system of contract work, 166.
value, 10.
Fraud, precautions against in sampling, 7.
General expenses, 173.
Gold deposits, 1.
enrichment, 28.
Hammer type of drill, 147, 148, 149.
Hand-drilling, 149.
-trucking, 133.
Haulage, electrical, 135.
equipment in shaft, 132.
mechanical, 134.
Hole system of contract work, 165.
Horizons of ore-deposits, 26.
Horizontal deposits, entry, 62.
stope, 98.
filled with waste, 108.
Hydraulic pumps, 142.
Impregnation deposits, 24.
Inch, assay, 10.
Inclined deposits to be worked from outcrop or near it, 62.
deposits which must be attacked in depth, 67.
shaft, 64.
capacity, 78.
Infiltration type of deposits, 24.
Intelligence as factor of skill, 163, 164.
Interest calculations in mine valuation, 43.
Iron hat, 27.
leaching, 27.
Ivanhoe mine, West Australia, 112.
Kibble, 132.
Labor, general technical data, 176.
handling, 161.
unions, 167.
Lateral underground transport, 133.
Le Roi mine, 112.
Lead, annual demand, 38.
deposits, 1.
enriching, 27.
prices, 1884-1908, 36.
-zinc ores, enrichment, 30.
Lenses, 24.
Levels, 87.
of Broken Hill, 119.
protection, 90.
Life, in sight, 44.
of mine, 157.
Locomotives, compressed-air, 135.
Lode mines, valuation, 1.
Lodes, 24.
Long-wall stope, 98.
Machine-drill, performance, 149.
drilling, 145.
vs. hand-drilling, 149.
Management, mine, 161.
Matte, 123.
Mechanical efficiency of drainage machinery, 139.
equipment, 124, 134, 138, 145.
Men for underground transport, 133.
Metal content, determining, 1, 3.
contents, differences, 6.
demand for, 35.
mine, value, 1.
Mines compared to other commercial enterprises, 183.
equipment, 124.
expenditures, 170.
Mines—continued.
life of, 157.
metal, value of, 1.
of moderate depths, 62.
to be worked to great depths, 62, 69.
valuation, 1, 13, 21, 34, 42, 51.
Mining engineering profession, 185.
Mt. Cenis tunnel, 145.
Morgan gold mine, 26.
Obligations of engineering profession, 192.
Openings, position in relation to secondary alteration, 23, 25.
Ore, average width in block, 13.
blocked-out, 17.
-bodies, 23.
shapes, 8.
calculation of quantities of, 13.
-chutes in shrinkage-stoping, 115.
-deposits, classes, 24.
determination of average metal contents, 3.
developed, 17.
developing, 17.
expectant, 17.
sight, classification, 13, 16.
support in narrow stopes, 118.
-shoots, 23.
weight of a cubic foot, 14.
width for one sample, 5.
Origin of deposit, 23.
Outcrop mines, 60.
Output, factors limiting, 155.
giving least production cost, 154.
maximum, determination, 153.
Overproduction of base metal, 158.
Oxidation, 30.
Patchwork plant, mechanical inefficiency of, 158.
Pay areas, formation, 23.
Pillars, artificial, 121.
value of metal mine, 1.
Possible ore, 17.
Power conditions, 139.
general technical data, 176.
sources, 126.
transmission, 125, 126, 127, 145.
Preliminary inspection, 55.
Previous yield, 3.
Price of metals, 35.
Producing stage of mine, 58.
Profit and loss account, 179.
factors determining, 2.
in sight, 16.
Proportional charges, 170.
Prospecting stage of mine, 58.
Prospective ore, 19.
value, 21.
Protection of levels, 90.
Pumping systems, 140.
Pumps, compressed-air, 141.
electrical, 141.
hydraulic, 142.
rod-driven, 142.
Ratio of output to mine, 153.
Recoverable percentage of gross assay value, 34.
Recovery of ore, 107.
Rectangular shaft, 74.
Redemption of capital and interest, 42.
Reduction of output, 158.
Regularity of deposit, 88.
Reliability of drainage system, 139.
Replacement, 24.
Reports, 56.
administrative, 178.
Resuing, 101.
Revenue account, 179.
Rill-cut overhand stope, 99.
method of incline cuts, 100.
filled with waste, 108.
-stoping, 96, 98, 99, 100, 137.
Risk in mining investments, 181.
in valuation of mines, 181.
Roadways, protecting in shrinkage-stoping, 114.
Rod-driven pumps, 142.
Rotary steam-pumps, 140.
Round vertical shafts, 74.
Runs of value, 8.
test-treatment, 3.
Safety, factor of, in calculating averages of samples, 12.
Sample, assay of, 7.
average value, 9.
narrow, diluting to a stoping width, 11.
taking, physical details, 6.
manner of taking, 4.
Sampling, 1, 3, 4, 5, 56, 177.
accuracy, 5.
percentage of error in estimates from, 11.
precautions against fraud, 7.
Saving of fixed charges, 155.
Secondary alteration, 24, 25, 26, 30.
enrichment, 21.
Security of investment, 158.
Self-dumping skip, 77.
Sets, 91.
arrangement for very deep inclined shafts, 71.
different depths, 60.
haulage, 129.
location, 70.
number, 72.
output capacity, 77.
shape, 74.
-stoping, 112.
advantages, 117.
disadvantages, 116.
when applicable, 116.
Silver deposits, 1.
prices, 38.
Sinking, speed, 80.
Size of deposit, 30.
Skill, effect on production cost, 163.
balanced, 129.
haulage in vertical shaft, 85.
Sollars, 109.
Solubility of minerals, 27.
Specific volume of ores, 14.
Speculative values of metal mine, 1.
value of mine, 57.
Spelter, annual demand, 38.
-set timbering, 104.
Stations, 84.
arrangement for skip haulage in vertical shaft, 85, 87.
Steam-pumps, direct, 140.
Steepening winzes and ore passes, 111.