This research is a part of an ongoing effort by the Bureau of Mines to improve health and safety in coal mining as directed by
Proper scaling is necessary for safe operation during any underground mining activity. This need is documented in the mandatory regulations for scaling found in 30
It has been reported that chalcopyrite can be floated selectively from an ore containing pyrite, sphalerite, and silicious gangue minerals without using a collector. Sodium
One of the major technological problems associated with beneficiation of complex, finely disseminated ores is the generation of large quantities of fine minerals less than
The procedures and tests descriptions are given for the ultimate gold carbon loading tests and the dynamic gold carbon loading tests. A 4.5 parts per
The Siwertell screw unloader operates at an average rate of 600 t/h with a peak capacity of over 800 t/h. The unloader consists of three
Although hydraulic mining was introduced in the United States before the turn of the century, it has not gained the degree of acceptance found in
Although wire rope has been in use for over 100 years, it is a complex structure that is still not well understood. Wire ropes are
Biological leaching of low-grade ores has been gaining interest and acceptability in recent years. Sulfide ores, which are subject to oxidation of specific bacteria such
The Bureau of Mines is conducting research to develop cost effective, environmentally compatible advanced mining technologies for the selective extraction of critical and strategic metals.