Portable Jaw Crusher
Comprehensive underground hard rock mining studies pointed out that significant reductions in ore handling costs could be attained if portable, low headroom, hard rock crushers were available to permit economical belt haulage from temporary locations close to production sites. Prompted by these reports a specific “Application Study of Portable Jaw Crusher” was initiated to quantify […]
Garnet Abrasives
The mention of Garnet as a Gem is one of the very common misunderstandings about this mineral. The Garnet as a semiprecious stone does not belong in the story of Garnet, the industrial tool, and yet it shares with the diamond the double, virtue of being a thing of beauty and utility. Prior to about […]
Inert Gas Generator
Belt Conveyor Reclaim Tunnels
Whenever the material and soil conditions permit its use, a belt conveyor in a reclaim tunnel is the most economical reclaim device due to its very limited manpower requirements and utilization of gravity to make the ore flow to the feeder opening. This dependence on material flow limits the belt conveyor in a reclaim tunnel […]
Potash Laboratory Flotation Tests
Large tonnages of high-grade sylvinite ores, containing low concentrations of water insolubles, have been processed in the Permian basin region near Carlsbad, N. Mex., during the past 40 years. The high-grade ores are rapidly being depleted, leaving large reserves of lower grade ore. This lower grade ore contains 1 to 8 percent water-insoluble slimes. These […]
Determining Mill Tailings Dam Seepage
One of the Bureau of Mines missions is to research the techniques required to achieve structural and environmental control of all mill tailings disposal, both surface and underground. Correlatively, then, the Bureau attempts through advanced practices to reduce jeopardy to life and property. The investigation reported herein stressed the surface-control aspect of this research, whereas […]
Oroville Dam Construction
Thus, 2½ years after completion, the engineering feat of Oroville Dam Construction still loans large. Let us take a close look at this project to see what made it unique. To begin with, it established a number of firsts: At 770 feet it was the highest earth fill dam in the world. At $121 million dollars, […]
Design a Dam for Mill Tailings
More than ever, public opinion is demanding the design of stable embankments as part of tailings disposal systems to aid in abating air and water pollution. Even though many areas have no restrictions requiring industry to impound its tailings, great interest has been generated through universities, industry, and Government in developing sound engineering principles regarding […]
Portland Cement Composition
The failure, or disintegration, of concrete in structures, even when the cement, sand, and coarse aggregate used have passed satisfactorily all tests and inspections, is not uncommon. Such failures occur even when proper methods of mixing and placing have been used and where weather conditions were correct. In these cases, the origin of the trouble […]
Mill Tailings Storage for Reprocessing in Future
It is not my purpose to write a lengthy article or to attempt the solution of the problem I am presenting, but to call attention to what I believe an important issue, hoping that it may arouse in some one, or in some company, a sense of responsibility. I am referring particularly to modern up-to-date […]