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Getting Gold Getting Gold J. C. F. Johnson Getting Gold Table of Contents Getting Gold..............................................................................................................................................................1 J. C. F. Johnson..............................................................................................................................................1 PREFACE......................................................................................................................................................1 CHAPTER I. INTRODUCTORY..................................................................................................................2 CHAPTER II. GOLD PROSPECTING−−ALLUVIAL AND GENERAL...................................................7 CHAPTER III. LODE OR REEF PROSPECTING.....................................................................................11 CHAPTER IV. THE GENESIOLOGY OF GOLD−−AURIFEROUS LODES..........................................16 CHAPTER V. THE GENESIOLOGY OF GOLD−−AURIFEROUS DRIFTS..........................................22 CHAPTER VI. GOLD EXTRACTION.......................................................................................................27 CHAPTER VII. GOLD EXTRACTION−−SECONDARY PROCESSES AND LIXIVIATION..............37 CHAPTER VIII. CALCINATION OR ROASTING OF ORES.................................................................43 CHAPTER IX. MOTOR POWER AND ITS TRANSMISSION................................................................47 CHAPTER X. COMPANY FORMATION AND OPERATIONS.............................................................49 CHAPTER XI. RULES OF THUMB..........................................................................................................56 CHAPTER XII. RULES OF THUMB.........................................................................................................61 i Getting Gold J. C. F. Johnson This page copyright © 2001 Blackmask Online. http://www.blackmask.com • PREFACE • CHAPTER I. INTRODUCTORY • CHAPTER II. GOLD PROSPECTING−−ALLUVIAL AND GENERAL • CHAPTER III. LODE OR REEF PROSPECTING • CHAPTER IV. THE GENESIOLOGY OF GOLD−−AURIFEROUS LODES • CHAPTER V. THE GENESIOLOGY OF GOLD−−AURIFEROUS DRIFTS • CHAPTER VI. GOLD EXTRACTION • CHAPTER VII. GOLD EXTRACTION−−SECONDARY PROCESSES AND LIXIVIATION • CHAPTER VIII. CALCINATION OR ROASTING OF ORES • CHAPTER IX. MOTOR POWER AND ITS TRANSMISSION • CHAPTER X. COMPANY FORMATION AND OPERATIONS • CHAPTER XI. RULES OF THUMB • CHAPTER XII. RULES OF THUMB Etext prepared by Dagny, [email protected] and John Bickers, [email protected] GETTING GOLD: A PRACTICAL TREATISE FOR PROSPECTORS, MINERS, AND STUDENTS. BY J. C. F. JOHNSON, F. G. S., MEMBER OF THE AUST. INST. OF MINING ENGINEERS; AUTHOR OF "PRACTICAL MINING," "THE GENESIOLOGY OF GOLD," ETC. PREFACE Some six years ago the author published a small book entitled "Practical Mining," designed specially for the use of those engaged in the always fascinating, though not as invariably profitable, pursuit of "Getting Gold." Of this ten thousand copies were sold, nearly all in Australasia, and the work is now out of print. The London Mining Journal of September 9th, 1891, said of it: "We have seldom seen a book in which so much interesting matter combined with useful information is given in so small a space." The gold−mining industry has grown considerably since 1891, and it appeared to the writer that the present would be a propitious time to bring out a similar work, but with a considerably enlarged scope. What has been aimed at is to make "Getting Gold" a compendium, in specially concrete form, of useful information respecting the processes of winning from the soil and the after− treatment of gold and gold ores, including some original practical discoveries by the author. Practical information, original and selected, is given to mining company Getting Gold 1 Getting Gold directors, mine managers, quartz mill operators, and prospectors. In "Rules of Thumb," chapters XI. and XII., will be found a large number of useful hints on subjects directly and indirectly connected with gold− mining. The author's mining experience extends back thirty years and he therefore ventures to believe with some degree of confidence that the information, original or compiled, which the book contains, will be found both useful and profitable to those who are in any capacity interested in the gold−mining industry. J. C. F. J. LONDON, November, 1896. CHAPTER I. INTRODUCTORY GOLD is a name to charm by. It is desired by all nations, and is the one metal the supply of which never exceeds the demand. Some one has aptly said, "Gold is the most potent substance on the surface of our planet." Tom Hood sings: Gold, gold, gold, gold! Bright and yellow, hard and cold; Molten, graven, hammered, rolled, Heavy to get, and light to hold; Stolen, borrowed, squandered, doled. That this much appreciated metal is heavy to get is proved by the high value which has been placed on it from times remote to date, and that it is light to hold most of us know to our cost. We read no farther than the second chapter in the Bible when we find mention of gold. There Moses speaks of "the land of Havilah, where there is gold"; and in Genesis, chapter xxiv., we read that Abraham's servant gave Rebekah an earring of half a shekel weight, say 5 dwt. 13 grs., and "two bracelets of ten shekels weight," or about 4 1/2 ozs. Then throughout the Scriptures, and, indeed, in all historic writings, we find frequent mention of the king of metals, and always it is spoken of as a commodity highly prized. I have sometimes thought, however, that either we are mistaken in the weights used by the Hebrew nation in early days, or that the arithmetic of those times was not quite "according to Cocker." We read, I. Kings x. and xli., that Solomon in one year received no less than six hundred and three score and six talents of gold. If a talent of gold was, as has been assumed, 3000 shekels of 219 grains each, the value of the golden treasure accumulated in this one year by the Hebrew king would have been 3,646,350 pounds sterling. Considering that the only means of "getting gold" in those days was a most primitive mode of washing it from river sands, or a still more difficult and laborious process of breaking the quartz from the lode without proper tools or explosives, and then slowly grinding it by hand labour between two stones, the amount mentioned is truly enormous. Of this treasure the Queen of Sheba, who came to visit the Hebrew monarch, contributed a hundred and twenty talents, or, say, 600,000 pounds worth. Where the Land of Ophir, whence this golden lady came, was really situated has evoked much controversy, but there is now a general opinion that Ophir was on the east coast of Africa, somewhere near Delagoa Bay, in the neighbourhood of the Limpopo and Sabia rivers. It should be mentioned that the name of the "black but comely" queen was Sabia, which may or may not be a coincidence, but it is certainly true that the rivers of this district have produced gold from prehistoric times till now. The discovery of remarkable ruins in the newly acquired province of Mashonaland, which evince a high state of civilisation in the builders, may throw some light on this interesting subject. CHAPTER I. INTRODUCTORY 2 Getting Gold The principal value of gold is as a medium of exchange, and its high appreciation is due, first, to the fact that it is in almost universal request; and, secondly, to its comparative scarcity; yet, oddly enough, with the exception of that humble but serviceable metal iron, gold is the most widely distributed metal known. Few, if any, countries do not possess it, and in most parts of the world, civilised and uncivilised, it is mined for and brought to market. The torrid, temperate, and frigid zones are almost equally auriferous. Siberia, mid−Asia, most parts of Europe, down to equatorial and southern Africa in the Old World, and north, central, and southern America, with Australasia, in what may be termed the New World, are all producers of gold in payable quantities. In the earlier ages, the principal source of the precious metal was probably Africa, which has always been prolific in gold. To this day there are to be seen in the southern provinces of Egypt excavations and the remains of old mine buildings and appliances left by the ancient gold−miners, who were mostly State prisoners. Some of these mines were worked by the Pharaohs of, and before, the time of Moses; and in these dreadful places thousands of Israelites were driven to death by the taskmaster's whip. Amongst the old appliances is one which approximated very closely to the amalgamating, or blanket table, of a modern quartz mill. The grinding was done between two stones, and possibly by means of such primitive mechanism as is used to−day by the natives of Korea. The Korean Mill is simply a large hard stone to which a rocking motion is given by manual power by means of the bamboo handles while the ore is crushed between the upper and basement stone. Solomon says "there is no new thing under the sun"; certainly there is much that is not absolutely new in appliances for gold extraction. I lately learned that the principle of one of our newest concentrating machines, the Frue vanner, was known in India and the East centuries ago; and we have it on good authority−−that of Pliny−−that gold saving by amalgamation with mercury was practised before the Christian era. It will not be surprising then if, ere long,
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