Equipment Company Handbook Denver Mineral Engineers Inc · Popular

For the practicing engineer, opening a Denver Handbook is a trip back to a time when mineral processing was an art backed by slide rules, and when a pump was guaranteed to work if you “Denverized” your circuit. Do you own a vintage copy of the Denver Equipment Company Handbook? Check the inside back cover—if the slide rule is still intact, you are holding a piece of mining history.

For nearly half a century, the Equipment Company Handbook —commonly referred to within the industry as the “Denver Handbook”—was the go-to operational reference for mill men, metallurgists, and plant operators. Published by Denver Mineral Engineers, Inc. (historically known as the Denver Equipment Company), this distinctive blue-and-white manual was more than just a product catalog; it was a practical education in mineral processing. Origins: Selling Through Education The Denver Equipment Company, founded in the early 20th century in Colorado, operated on a simple principle: an educated customer buys the right equipment. In an era before the internet or standardized university curricula for mineral processing, mill operators relied on experience and word-of-mouth. Equipment Company Handbook Denver Mineral Engineers Inc

The company began compiling technical data sheets, flow diagrams, and operational guidelines into a single bound volume. By the 1940s, the Denver Equipment Company Handbook had become a standard text. The book was famous for its utilitarian, no-nonsense layout. It was not a theoretical treatise but a shop-floor reference . Standard editions (often the 4th, 5th, and 6th editions are most remembered) typically included: 1. The “Denver Slide Rule” (Inside Back Cover) Perhaps the most famous feature was a physical slide rule printed on the inside back cover. Operators used it to calculate pulp densities, specific gravities, and percent solids without a calculator. 2. Weights & Measures Tables Extensive charts covered everything from the weight of steel balls per cubic foot to the volume of a conical pile of ore. 3. Pumping Data A deep dive into the sizing of Denver SRL (Soft Rubber Lined) pumps . It included friction loss charts for various slurry concentrations and pipe diameters. 4. Flotation Fundamentals The handbook explained the principles of froth flotation—reagents, air flow, and pulp level control—specifically for Denver’s “Sub-A” (Sub-Aeration) flotation machines. 5. Crushing & Grinding Circuits Standard flowsheets for open and closed circuit crushing, along with rod mill and ball mill charging formulas (e.g., Bond’s Work Index applied practically). 6. Thickening & Filtration Data on settling rates, Dorr clone sizing, and vacuum filter capacities. The “Sub-A” Flotation Machine Connection Denver Mineral Engineers is legendary for the Sub-A Flotation Machine , the first self-aerating mechanical cell to achieve global dominance. The handbook provided the specific metallurgical balance for these cells, teaching operators how to troubleshoot rotor-stator wear and air intake leaks. For many mines, the handbook was the only manual available for maintaining this critical circuit. Decline and Legacy The handbook’s run peaked in the 1950s-1970s. As digital calculators and later personal computers emerged, the printed slide rule and log tables became obsolete. Denver Mineral Engineers (now part of the Svedala/Metso family) eventually stopped printing the comprehensive handbook, shifting to specific product manuals. For the practicing engineer, opening a Denver Handbook