Chapter 1: Valuation of Copper, Gold, Lead, Silver, Tin, and Zinc Lode Mines

Determination of average metal content; sampling, assay plans, calculations of averages, percentage of errors in estimate from sampling.

CHAPTER II.

Mine Valuation (_Continued_)

Calculation of quantities of ore, and classification of ore in sight.

CHAPTER III.

Mine Valuation (_Continued_)

Prospective value. Extension in depth; origin and structural character of the deposit; secondary enrichment; development in neighboring mines; depth of exhaustion.

CHAPTER IV.

Mine Valuation (_Continued_)

Recoverable percentage of the gross assay value; price of metals; cost of production.

CHAPTER V.

Mine Valuation (_Continued_)

Redemption or amortization of capital and interest.

CHAPTER VI.

Mine Valuation (_Concluded_)

Valuation of mines with little or no ore in sight; valuations on second-hand data; general conduct of examinations; reports.

CHAPTER VII.

Development of Mines

Entry to the mine; tunnels; vertical, inclined, and combined shafts; location and number of shafts.

CHAPTER VIII.

Development of Mines (_Continued_)

Shape and size of shafts; speed of sinking; tunnels.

CHAPTER IX.

Development of Mines (_Concluded_)

Subsidiary development: stations; crosscuts; levels; interval between levels; protection of levels; winzes and rises. Development in the prospecting stage; drilling.

CHAPTER X.

Stoping

Methods of ore-breaking; underhand stopes; overhand stopes; combined stope. Valuing ore in course of breaking.

CHAPTER XI.

Methods of Supporting Excavation

Timbering; filling with waste; filling with broken ore; pillars of ore; artificial pillars; caving system.

CHAPTER XII.

Mechanical Equipment

Conditions bearing on mine equipment; winding appliances; haulage equipment in shafts; lateral underground transport; transport in stopes.

CHAPTER XIII.

Mechanical Equipment (_Continued_)

Drainage: controlling factors; volume and head of water; flexibility; reliability; power conditions; mechanical efficiency; capital outlay. Systems of drainage,--steam pumps, compressed-air pumps, electrical pumps, rod-driven pumps, bailing; comparative value of various systems.

CHAPTER XIV.

Mechanical Equipment (_Concluded_)

Machine drilling: power transmission; compressed air _vs._ electricity; air drills; machine _vs._ hand drilling. Workshops. Improvement in equipment.

CHAPTER XV.

Ratio of Output to the Mine

Determination of possible maximum; limiting factors; cost of equipment; life of the mine; mechanical inefficiency of patchwork plant; overproduction of base metal; security of investment.

CHAPTER XVI.

Administration

Labor efficiency; skill; intelligence; application coördination; contract work; labor unions; real basis of wages.

CHAPTER XVII.

Administration (_Continued_)

Accounts and technical data and reports; working costs; division of expenditure; inherent limitations in accuracy of working costs; working cost sheets. General technical data; labor, supplies, power, surveys, sampling, and assaying.

CHAPTER XVIII.

Administration (_Concluded_)

Administrative reports.

CHAPTER XIX.

The Amount of Risk in Mining Investments

Risk in valuation of mines; in mines as compared with other commercial enterprises.

CHAPTER XX.

The Character, Training, and Obligations of the Mining Engineering Profession

Index

PRINCIPLES OF MINING.