Vanning Shovel & Frue Vanner
Some time ago, we had to decide the question whether it would pay to re-treat slime-tailings, and several machines were tested in order to ascertain the type of construction which would give the greatest saving. In previous tests on the ore of this company, several tables proved far inferior to Vanning and for this reason they […]
Granitic Magma Crystallization
In discussing the crystallization of a granitic magma it is sometimes assumed that there is a simple pro rata increase of the water content of the residual liquid as crystallization proceeds; i.e., it is assumed that, when the proportion of crystals amounts to one-half, the amount of water in the liquid is doubled, and when […]
Vanadium Deposits
The scope of this paper is the description of two districts in Peru in which vanadium deposits have been found, and the consideration of much laboratory-work that I and others have done to determine the nature of these deposits. It is with regret that I present some of the data in a state of evident incompletion, […]
Ore Sampling Methods: Good & Proper
From the old-fashioned “ grab-sample ” to the modern timing- device, which takes a machine-sample with mathematical precision, there is a wide gap, which was only crossed by many years of toil and unremitting endeavor. Even to-day, notwithstanding the advancement in the art, “ grab-sampling ” is still practiced—sometimes to afford the unscrupulous mine-promoter a […]
Metallurgy Laboratory Equipment
The Hammond Mining and Metallurgical Laboratory and its Equipment was the gift of Prof. John Hays Hammond to the Sheffield Scientific School of Yale University. Professor Hammond was graduated from this school in the class, and has always shown great interest in its welfare and progress. He offered to build and equip for it a mining and […]
Gold Dredge Components & Parts
The design and specifications submitted in this paper are not offered as satisfying all conditions of gold dredging. Many rich stream-beds would not give “ elbow-room ” for such a dredge: many otherwise favorable gold-bearing areas are too small to warrant the cost of its installation; and, in some localities, as I have already remarked, […]
Hydraulic Gold Dredging
Repeated failures in attempts to work gold-bearing gravels by means of suction dredges have created the impression that this method is impracticable. The suction hydraulic gold dredges have failed from three special causes: excessive wear and frequent breakage of pump-shell, runners and liners; inability to dredge compact gravel which would not readily move towards the intake; […]
Hyperfusible
Hyperfusible, adj. (of a substance) capable of reducing the melting ranges in end-stage magmatic fluids. The course of fractional crystallization of subalkaline magmas epitomized in the schematic reaction series is the net result of all the factors that contribute to phase equilibrium in the poly-component system concerned. Just what the components of the system may […]
Tunneling Machines
If we could keep the rock-drills running all the time, and eliminate all the other operations except as they could be carried on without interfering with the drilling, that would certainly seem to promise more rapid progress. This is the idea which the inventors of the tunneling-machines are working on, and it is no wonder […]
Graphic Solution of Kutter’s Formula
A Graphic solution of Kutter’s formula for the flow of water has been worked out by Dr. L. I. Hewes in connection with his course in Graphic Computations, given in the Sheffield Scientific School, Yale University, which may be of interest to those who deal with canals, flumes and streams is probably the most accurate […]