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Golden Opportunities FORWORD When I was Chief Metallurgist at Bechtel Corp. I put together for my metallurgists a little publication called The Circulating Load. It contained articles describing both good and not-so-good things in plants we, and others, had built. It was also distributed to several of our clients who had requested to be put on the mailing list. In 2002 Doug Halbe suggested that it be published by SME, which it was, and the next year SME published it in Spanish, the first book in that language by SME. One of my metallurgists at Bechtel, Mario Watkins, did a superb job on the translation. Later, as a consultant, I consulted fifteen years for Gold Fields and had the pleasure of participating in the design of their Mesquite and Chimney Creek plants and a number of studies. Most of my time was spent making bi-monthy visits to their mills just to talk to their metallurgists. Jim Arnold, who was Mill Superintendent at Chimney Creek, adopted the Circulating Load idea and became the editor of Golden Opportunities which was written by Gold Fields metallurgists. Doug Halbe was also a valued contributor. I should add here that I have never worked with a finer and more talented group of people than those at Gold Fields. GO, as it was known by, was primarily written for gold people but all of the articles will be of interest to others as milling practice is not limited to one metal. Some ofthe articles are perhaps out of date but if the reader will dig a little deeper he will find some mighty fine thinking that it will pay to absorb. Hopefully, this publication will be of benefit to many metallurgists and encourage them to think freely to solve their problems. Many years ago when I worked for Union Carbide I was asked by management to fill out a long questionnaire that would tell what I thought my job should be. I left all the spaces blank and attached the following sentence. "Every engineer should use a half hour each day to do nothing but think." Robert S. Shoemaker, June 3, 2004 INDEX Using Lotus 1-2-3 for Metallurgical Plant Design and Optimumization J.O. Marsden Using IBM Personal Computers For Process Control J.O. Marsden High pH and Cyanide Consumption Jim Arnold Tailings Thickeners John Mansanti The Complaint Party Jim Arnold Buying Used Equipment Watts My Pinion Debate-Oxidation of Sulfides Jim Arnold Acid Washing of Heat Exchangers John Mansanti Dissolution Rate Of Gold In Alkaline Cyanide Solutions J.O. Marsden Prussian Blue Formation As A Means Of Preventing HCN Generation John Mansanti Cyanide Consumption In Test Columns Tim Haldane Liner Experience At Mesquite Larry Todd Behavior Of Nickel and Other Metals In CIP-E/W Circuits Doug Halbe Cyanide Titration Results-Not The Whole Story Doug Halbe Daily Ore Grade Estimation Thomas C. Lyon Computer Aided Design At Mesquite Bill Pennstrom Determination Of Flow Pattern Cindy S. Jones Re-plating Hints Jim Arnold Suggestions For Feeding Clay Ores John Mansanti On-line Cyanide Monitoring John Marsden Pilot Test Heaps-Pros And Cons Larry Todd The Perito Curve Jim Arnold Preventive Maintenance? Mike Gleason Financial Chemistry Tim Miller Electrolytic Cells Doug Halbe Carbon Transfer Design Jim Arnold Things We'd Have Done Differently At Chimney Creek Jim Arnold Sampling Of Materials Using a Visman's Equation Approach Tim Miller Drip Irrigation Tim Haldane Hopper Clarifiers John Marsden High Moisture In The Sample Plant Todd Roth Residue Drilling At Mesquite Alex Ruzycki Sulfide Ore Bio-Oxidation Les Thompson Tuning PID Control Loops John Marsden Simple Macros For Everyday Use With Lotus Melinda Rogers The Effect Of Temperature On Cyanidation Doug Halbe Mercury Hygiene In Mesquite's Refinery Dennis Vaughn Professional Registration Jim Arnold Schedule Change Statistics Tim Haldane Gold Metallurgy References John Marsden Cyanide Consumption at Mesquite Tim Miller A Simple Preg-rob Test Alex Ruzycki Determination Of Organics On Carbon Tim Miller Variable Speed Drives Mike Gleason Re-leaching At Mesquite Tim Haldane Sump Design Mike Gleason To Float Or Not To Float That Is The Question John Marsden Information contained in this work has been obtained by SME from sources believed to be reliable. However, neither SME nor its authors guarantee the accuracy or completeness of any information published here, and neither SME nor its authors shall be responsible for any errors, omissions, or damages arising out of the use of this information. This work is published with the understanding that SME and its authors are supplying information but are not attempting to render engineering or other professional services. If such services are requested, the assistance of an appropriate professional should be sought. Any statements or views presented here are those of the authors and are not necessarily those of SME. The mention of trade names for commercial products does not imply the approval or endorsement of SME.

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