amalgam—Special difficulties, how to overcome them.

pp. 59-86

CHAPTER VII

GOLD EXTRACTION

(SECONDARY PROCESSES AND LIXIVIATION)

Choosing the plant—-Various ores and their constituents—Amalgamation—Various concentrators—Percussion tables—Frue vanner—Pan concentration—Simultaneous grinding and amalgamating condemned—Watson and Denny pan—Good machines often condemned—Procedure in ore treatment—Duncan pan—Calcining—Rotatory amalgamator—Steaming concentrates—Dry amalgamation—Sulphuric acid and sickened mercury—Amalgamation without overflow—Experiments—Steam as an agent in gold extraction—Lixiviation by chlorine—Various processes—Mount Morgan—Cyanide process.

pp. 87-99

CHAPTER VIII

CALCINATION OR “ROASTING” OF ORES

Effect of roasting—Various methods—Reverberatory furnaces—Howell, White, Brückner, Thwaite-Denny, and Molesworth types of revolving cylinder furnaces—Shaft type—The Stetefeldt furnace—Chimneys—Depositing chambers.

pp. 100-108

CHAPTER IX

MOTOR POWER AND ITS TRANSMISSION

Water and steam power—Waterless power plant described—Oil engines—Electric transmission—Advantages of electric power—Its possibilities.

pp. 109-112

CHAPTER X

COMPANY FORMATION AND OPERATIONS

Mining becoming a scientific business—Initial mistakes in public companies—Self-styled mining experts—How articles of association are compiled—How directors and officials are chosen—The usual consequences—Remedies—State inspectors—Certificates for mine managers—Directors—Specialists in various branches advisable—Qualifications of mine managers—Economic advantages of co-operation—Joint central extraction works—Folly of adopting untried new processes without full knowledge—Pertinent quotation—Warning to directors—Robbing mills—How prevented—Conclusion.

pp. 113-126

CHAPTER XI

RULES OF THUMB

Living places—A bush bed—Northern Territory hammock—Purifying water—To obtain water from roots—An effective filter—Canvas water-bag—Medicine case—Producing fire—To copy correspondence—Simple telegraphic code—A serviceable soap—To cross a flooded stream—To make a hide bucket—To make a “slush lamp”.

pp. 127-139

CHAPTER XII

RULES OF THUMB

(MINING APPLIANCES AND METHODS)

A temporary forge—Making charcoal—Rough smelting on the mine—Misfires in blasting—To prevent loss of rich specimens in blasting—Simple retorting of small quantities of amalgam—Simple mode of ascertaining nominal H.-P. of engine—Scaling copper plates—How to supply mercury and water to mortar-boxes—Power for mills—To avoid loss in cleaning up—Iron extractor—To silver copper plates—How to make a dolly, rough windlass, puddler—A makeshift pump—Squeezing amalgam—Sluice plates—Measuring inaccessible distances—To set out a right angle with tape—Simple levelling instruments—Levelling by aneroid barometer—To determine heights—To find depth of shaft—Plan for re-using water—Cooling compound for heated bearing—Cleaning greasy plummer blocks—An excellent anti-friction compound—To clean brass—A solvent for rust—To protect iron and steel from rust—To keep machinery from rusting—Fire-lute—Rope-splicing.

pp. 140-166

APPENDIX

1. SELECTED DATA FOR MINING MEN.

To find lost part of a vein—Calculation of ore reserves—Hydraulics—Boring—Durability of ropes—Diamond drilling—Notes on timber—Laying out areas—Mensuration—Mine surveying problems—Rainfall—Belting notes—Weight and bulk of materials—Chemical elements and their symbols, &c.—Common names of chemical substances—Thermometer readings—Freezing, fusing, and boiling points—Heat values of fuels—Signs and symbols used in expressing formulas—Weights and measures—To find contents of a tank—Sizes and weights of corrugated iron sheets—Thickness and weight of sheet iron—Qualities of ropes—Atmosphere—Fresh and salt water—Velocity of falling fluids—Pressure of water—Table of squares and cubes, and their roots—Wages and interest tables.

pp. 167-193

2. AUSTRALASIAN MINING REGULATIONS pp. 194-201

INDEX pp. 203-206

GETTING GOLD

CHAPTER I

INTRODUCTORY

Gold