How to Save Hole Sludge in Diamond Drilling
Set the standard sludge box just below the floor of the shanty and in such position that there is room to siphon off the water and take out the sample without moving the box. Connect a tee to the top of the standpipe or casing and lead a pipe from it to the nearer end […]
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 […]
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 […]
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 […]
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 […]
Rolled Steel Roll Shells Manufacturing
Without going into an elaborate history of the subject, the following may be mentioned treating on the evolution of roll shells. During the early days of mining-machinery construction, cast iron was used for practically all such grinding devices as those under consideration, usually some good mixture of gray iron being the most suitable for wearing […]
Roll Crushers: Principles, Applications, and Benefits in Mineral Processing | 911 Metallurgist
The art of crushing ores and other materials by means of rolls is a comparatively recent one. While the first record of rolls using iron crushing-surfaces dates back to the year 1806, when they were employed in Cornwall, their principal development has taken place during the past 130 years. To Stephen R. Krom belongs the […]
Reverberatory Smelting
In reverberatory smelting, fuel is the chief item of expense, as it commonly is in processes using large percentages of it. Hence the most suitable supply is eagerly sought; that is, the supply which, in the end, yields the greatest net profit. The better grades are not infrequently bought, even at an advanced price, because […]
Mine Shaft Sinking Method
The following is not offered as an extended paper on the subject of shaft sinking, but more as a description of the present practice of shaft sinking in the Butte district. The Anaconda company is sinking at present the following shafts: Badger State, Moose, Mountain Consolidated, Mountain View, Pennsylvania and Tropic. At the High Ore and […]
Mine Bulkheads – Design, Construction & Cost
While the installation of mine bulkheads to retain water under high pressure is by no means a rarity, the following points which arose in the designing and placing of two of these bulkheads may be of interest: The Hibernia magnetite mine, located about 40 miles west of New York, in the State of New Jersey, […]