World demand and production of diamonds both for gem and industrial purposes has increased nearly five-fold during the past 25 years. Improved mining and recovery methods together with the discovery and development of new fields has enabled mining operations to fill the growing demands. Producing areas in South Africa, South West Africa, The
The production of gold bullion from gravity or flotation concentrates is often an important economic consideration for an isolated gold mining operation. It is assumed in this case that the coarse free gold has been recovered by the Mineral Jig in the grinding circuit and that the jig concentrate has been amalgamated. This treatment produces
The handling of large quantities of gold-bearing gravels is of utmost importance for most successful placer operations. In addition to providing efficient washing and recovery methods, the placer plant should be constructed as a compact unit that can be readily moved. This is an important consideration because the washing and recovery plant should
The ore occurs as uraninite adhering to the outside of sand grains in the Wind River formation which rest unconformably upon Cretaceous shales. The ores are relatively low in clay content and generally regarded as exceptionally clean ores from the standpoint of objectionable impurities. The arkosic sands in which the ore occurs are very porous and
The treatment of copper ores, both oxides and sulfides by means of flotation, hydrometallurgy or other processes has been well established for many years. Flotation has been applied generally to the treatment of sulfide ores, both in small and large scale operations.
Hydrometallurgical methods alone or in combination with flotation have mainly been
In the metallurgical treatment of uranium ores large tonnages must be handled. Many ores are low grade so it becomes necessary to employ systems which can be operated on a continuous basis at low cost. A vast amount of research has gone into the development of suitable processes. One is solvent extraction, which has proven
The Abbott mercury mine and mill are situated at an elevation of 2,000 feet in Lake County, California, approximately 24 miles west of Williams on State Highway 20 towards Clear Lake. Williams, which is served by the Southern Pacific railroad, is a local supply point as well as Colusa, located 10 miles east of Williams on State Highway 20.
Aerial view of the Opemiska Copper Mines (Quebec) Ltd., Mill Buildings and Shaft Area.
The Opemiska mine property is in Levy Township in Chibougamau area of Quebec and is comprised of 487 acres of patented claims contiguous with 2,215 acres held under development license. The townsite of Chapais which serves the mine community is