Platinum Alloys with Tungsten & Molybdenum
Metallurgical research has discovered many an alloy possessing properties not combined in any single metal, and progress still consists chiefly in the investigation and utilization of alloys. In the case of iron, the demands of automobiles, high-speed machines and high-duty engines have led to the production of special iron alloys which will meet any reasonable […]
Natural Flotation Reagents form Plants
The reagents now used in flotation consist of various acids or salts, which may be either electrolytes or nonelectrolytes, dissolved in water and some substance or combination of substances, which function as collecting or frothing agents. At times the only dissolved salts present are those naturally occurring in the water used. The general effect of […]
Drill Holes Assay Result Interpretation
In the exploration of a copper deposit by drilling, obvious advantages are to be gained from a distinction between primary and secondary ore. Perhaps the chief of these is the aid which such a distinction renders in determining where a given hole should stop. The copper assay, often a sufficient guide, cannot always be exclusively […]
Lighting Underground Mine & Illumination
In preparing this paper the object has been to set forth facts relating to lighting or illumination problems faced in underground mines, which, judging from the results realized in the iron and steel and other industries somewhat similar to mining, will tend toward furthering safety, production, and contentment of employees, as well as economy of […]
Cost of Producing Concentrates from Ore
From the viewpoint of mineral economics, the ultimate and significant production cost is that per unit of metal produced rather than the cost per ton of ore treated. This viewpoint is natural to processors of ores whose final product is refined or unrefined metal, whether they be companies engaged solely in smelting, or integrated companies […]
How & Where to Sell Ore, Concentrates, and Bullion
With the exception of gold, metal prices are subject to frequent fluctuation, resulting in corresponding variations in the value of their ores. Metal prices are quoted periodically in technical and trade journals and average yearly prices in the principal markets are discussed in the Minerals Yearbook, published annually by the Bureau of Mines. From time […]
Mining Property Engineering Valuation
Engineering valuations of raining properties are made for a number of purposes, principally the following: For purposes of purchase or sale on behalf of prospective buyers or vendors. For purposes of financing by bond issues or sales of stock. As a basis for taxation. In connection with trespass or damage suits. Theoretically the value of […]
Treatment Methods of Lead & Zinc Ore
Lead and Zinc Ores Minerals of lead and zinc commonly are rather closely associated in nature; zinc-free lead ores and lead-free zinc ores are exceptional rather than common, although there are such. Lead and zinc ores usually contain some silver, but those of the Mississippi Valley region are silver-free. Indeed, lead-zinc ores often are commercially […]
Power Electric Mining Shovel Operation
Power Electric Mining Shovel & Dragline Pits The determination of mining and stripping limits prior to undertaking exploitation by power-shovel methods requires careful engineering and often involves complicated computations. Engineering Estimates Stripping of overburden and capping in open-pit mining corresponds to development work in underground mining and, as previously pointed out, is a part of the ore-production cost. The […]
History of Mining Equipment & Practices
When most people think of shovels they think about the type of shovel used for metal detecting and general usage but since late in the last century, power shovels and draglines for digging and loading and locomotives and cars for hauling from the pit have been in general use at most large-scale open-pit operations. Starting […]