Gravity Concentration

Sulfide Oxide Lead Zinc Transitional Ore Treatment Processing Method

The mineral dressing research here reported is part of a continuing program by the Bureau of Mines to develop new or improved concentration processes for oxidized or partly oxidized lead and zinc ores. A sample of low-grade sulfide-oxide, lead-zinc ore from Jasper County., Mo., containing galena, cerussite, pyromorphite, hemimorphite, smithsonite, and sphalerite was concentrated by … Read more

Black Sand Minerals in Gold Placer Deposit

This report describes work done as part of a Bureau of Mines program to appraise the titanium-mineral resources of Idaho. The work included both field reconnaissance and a spot churn-drilling program. Much general information was available, as a result of earlier work done under the Western Radioactive Minerals Exploration Program conducted between 1950 and 1954 … Read more

Heavy Liquid Separation

We are continuously engaged in research activities to develop or improve methods of utilizing our mineral resources. One such method, heavy liquid separation (HLS), has long been a recognized laboratory technique to separate minerals but only in recent years has this method been considered as a continuous process. The best prospects appear to be the … Read more

Heavy Liquid Cyclone Separation

Kyanite ore deposits occur in the Southeastern United States. The ore reserves in this area are estimated at about 100 million tons having an average grade range from 10 to 30 percent kyanite. The Graves Mountain kyanite-quartz rock ore deposit consists of a prominent ridge about 1 mile long and 300 to 400 feet high. … Read more

How to Remove Bismuth from Lead

The Betts electrolytic process was for many years the only method available for debismuthizing lead Kroll suggested the use of calcium to form a high-melting-point Ca-Bi intermetallic compound that could be separated from molten lead. This process, however, was not used industrially. About a decade later, Betterton developed a commercially feasible process using a combination … Read more

How to Remove Pyrite from Coal

In recent years, coal research has been directed toward environmental problems of the electric power generation industry. A major problem of coal-burning power-plants is reducing the air pollutants in stack gases. In most of these plants, the chief pollutant is SO2, which results from the combustion of sulfur compounds present in the coal. Stack-gas cleaning … Read more

Mineral Jig Concentrator

The Duplex Mineral Jig Machine belongs to gravity concentrating device that separates material based on differing densities of the material. The Jig is widely used in concentration of heavy minerals such as tin, gold, tungsten, manganese and barite. The 911MGTK-XCT Laboratory Mineral Jig Machine is an ideal instrument for research of beneficiation of ferrous metal … Read more

Concentrating Tables

Wet-Process coal-washing tables as we know them today have been in use in this country for approximately 25 years. The literature records only a few table installations worthy of note prior to adoption of the present-day differential-motion table. According to Phillips, six Campbell bumping tables were being operated by the St. Bernard Coal Co., Earlington, … Read more

Alluvial Tin Mining

A relatively small area in Malaya, about 200 miles long by 40 miles wide, is the most important source of tin in the world. Some tin is recovered in other parts of the peninsula. Of the tin mined, 98 pct is recovered from alluvial deposits. From 1935 to 1941 the average annual world production of … Read more

How to Recover Flake Mica

A new method for concentrating the flake mica either from present washing plant tailings or from new feed has been developed. In this paper, flake mica refers to that which occurs in weathered granites, alaskites, pegmatites, and schists in a form too fine to be considered sheet mica. It ranges in size from 1 in. … Read more