Rare Publications on Ebook

Practical Stamp Milling and Amalgamation

by

H.W. MacFarren

1914

Contents

TABLE OF CONTENTS

PART I STAMP-MILLING

CHAPTER I

Page.

The Stamp-Mill 9

Location and Design 11

Rock-breaker, Grizzly, and Ore-bin 14

Battery-frame and Line-shaft 24

Mortar-block 27

CHAPTER II

Mortar and Mortar Liner 34

Shoe and Die 40

Bosshead 45

Tappet 46

Cam 50

CHAPTER III

Stem and Stem Breakage 53

Fastening the Stem 56

Adjusting Height of Drop 60

Cam Shaft and Cam-shaft Box 61

Order of Drop 65

Stem Guide 67

Finger Jack 68

Feeder 69

Screen 72

CHAPTER IV

Water Supply 84

Principles of Stamp Crushing 86

Height and Speed of Drop 87

Weight of Stamp 90

Height of Discharge 97

Feeding the Mortar 98

Power 99

Individual Stamp . 101

PART II AMALGAMATION

CHAPTER V

Properties and Care of Mercury 107

Principles of Amalgamation 109

Inside Amalgamating Plates , . 110

6 TABLE OF CONTENTS

CHAPTER VI

Page.

Splash and Lip-Plates 114

Apron-Plate 116

Dressing and Care of Apron-Plate 118

Feeding Mercury 122

Dry Amalgamation 124

Outside Amalgamation 125

Amalgamation in Cyanide Solution 127

Water Required in Amalgamation 128

Temperature of Battery Water 130

Period Between Plate Dressing 131

CHAPTER VII

Construction and Arrangement of Apron Table 132

Accessories to the Apron Table 134

Plates Away from Mortar 136

Silvered or Raw Copper Plates and their Handling 137

Recovering Gold from Old Plates 139

Chemicals and their Use 140

Unsatisfactory Bare and Hard Plates 142

Cleaning Amalgam and the Clean-Up 144

CHAPTER VIII

Retorting and Percentage of Metal in Amalgam 150

Melting and Sampling Bullion 152

Recovering Gold from Slag, Old Screens, Etc 156

PART III GENERAL

CHAPTER IX

Loss of Gold in Amalgamation and Its Remedies 161

Sizing and Mill Tests 165

Sampling 169

Milling Systems 170

CHAPTER X

Millmen and Mill Crews 176

Mill Management 181

Handling Pulp and Tailing 185

PART IV ARRANGEMENT AND CONSTRUCTION COSTS OF

STAMP-MILLS

By CHARLES T. HUTCHINSON

CHAPTER XI

Arrangement of Stamp Battery 191

Light and Heavy Stamps 195

Sectionalized Machinery , 198

Jaw and Gyratory Crushers 202

Purchasing a Mill 206

Selection of Millsite 210

Cost of Constructing Stamp-Mills . . 211

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