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
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
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
Any contribution on manganese steel by its discoverer necessarily carries with it much weight and is entitled to serious and close consideration. The momentous discovery
In view of the prominence which the conical mill has attained in the fine-crushing field within the few years since its introduction, the following comparison
Nearly every mining and metallurgical engineer will recall his early experience and method of producing step- or stage- reduction in preparing ore-samples for assay, in
In giving my opinion of the importance of Colombia as a field for investment for those interested in mining for the precious metals, I must
Technical progress takes place in two directions: the improvement of methods, affecting the quality of the product; and increase in the economy of operations, affecting
This old and well-known method of determining silver is, in bullion work, so far superior to the furnace-assay that it is looked upon with reverential