Bucket Elevators

Bucket elevators are used for the elevation of dry or pulped ore. They consist of an endless chain or belt carrying the buckets vertically or at a steep angle. On reaching the top pulley they should turn at sufficient speed to fling their contents out with a measure of centrifugal force. The feed is directed into … Read more

Applied Mining Geology

The geologic notes are taken as soon as possible after the ground is broken so that any mistake in the mining may be corrected at once, or any particularly advantageous procedure may be suggested before any useless work is done. Taking the notes underground is a comparatively simple matter, but a few necessary precautions may … Read more

Topographic Maps for Mining Engineer

Few authors of treatises and papers on engineering subjects have given adequate attention to topographic maps. The statement applies especially to mining engineering in all branches. Even those who have discussed such maps have treated the subject only in a general way. Therefore it is proposed to outline in this paper a few of the … Read more

Timbering Underground Mining Tunnels & Galleries

This paper is not intended to be a technical discussion of square-set framing as used in mines, but merely a short description of the different kinds of framing that have been used in the Butte mines, and what has been decided upon, after years of practical experience, as being the best, taking into consideration the … Read more

“Wood” Flotation Process & Machine

In my opinion, the concentration of minerals by flotation is the most interesting problem in ore-dressing, and will command eventually far more consideration than it has at present. For many ores it furnishes a complete method of concentration absolutely independent of specific gravity, and thus simplifies the milling of many difficult combinations. Not having to … Read more

Sorting Classifiers

The purpose of this paper is to present a brief sketch of the development of this hindered-settling “sorting” classifier, but primarily to show the actual results obtained in practice with the classifier working on the Butte copper ores at the Boston & Montana Concentrator at Great Falls and the Washoe Concentrator at Anaconda. The writer … Read more

Sampling of Gold Bullion for Quality Control – Elemental Analysis

At the Seventh International Congress of Applied Chemistry I presented a paper, The Assay and Valuation of Gold-Bullion, in which are briefly mentioned a few illustrations of different methods of sampling gold-bullion, particularly cyanide-bars. Since then I have carried on an extensive investigation upon the sampling of gold-bullion in relation to its effects upon the … Read more

Coarse Gold Sampling Method

As run for student class-work the mill contains a feeder, stamps, plate, and vanner. Results in the past indicate that the work of these machines is just as efficient as that of a regular mill handling the same class of ore. It has been the custom to obtain ore principally from Nova Scotia, mainly because … Read more

How to Survey & Sample Diamond Drill Holes

Here is a paper on surveying and sampling diamond-drill holes. The present paper gives a more thorough description of these methods, together with a few changes and notes suggested by further experience. Since, the methods, used constantly by the Cleveland-Cliffs Iron Co., have been developed to a higher degree of efficiency, and have given great … Read more

How to Make Salt by Solar Evaporation

Salt Making Processes The production of salt in the United States divides itself at the outset into two distinct classes: The mining of rock salt and its purification and separation into marketable sizes, and the production of salt by evaporation from brines, bitterns, and other solutions. The processes employed at the present time in the … Read more