I consider the lead and zinc deposits of the Mississippi Valley to be the result of descending waters. There are many features that we have
These notes are based on observations made while on a recent trip through the West, for the purpose of studying the practical operation of the
Long ago, zinc refining had not become a general practice among the zinc smelters in the United States. Such refining as had been carried on
The observations here presented are not those of an expert accountant, but of one who, while he has seen considerable service in the accounting departments
It is a fair assumption that the main purpose of any diagram is to present facts to the eye in more convenient form than they
During the past years, the safe and efficient lighting of the coal mines of this country has received an ever-increasing amount of attention. Several States
Of the several interesting physical properties of clay which have claimed the attention of investigators in recent years, none is more important than the behavior
This cyanide precipitate is unique in that it is apt to vary widely in composition in the course of very short periods of time, and
In the West, capitalists have expended many millions of dollars developing the low-grade porphyry ores of copper. Half a dozen of these great enterprises have
In a tin concentrator an appliance was needed to furnish a suitable product for fine jigging from a pulp of the following composition: In the