(Encyclopedia) ore, metal-bearing mineral mass that can be profitably mined. Nearly all rock deposits contain some metallic minerals, but in many cases the concentration of metal is too low to…
WALDEN, Greg, a Representative from Oregon; born in The Dalles, Ore., January 10, 1957; B.S., University of Oregon, Eugene, Ore., 1981; member of the Oregon state house of representatives,…
WHAT ARE PRIMARY INDUSTRIES? WHERE ARE INDUSTRIES LOCATED? WHAT IS A COTTAGE INDUSTRY? RAW MATERIALSFIND OUT MOREIndustry is a general term meaning the businesses and organizations that provide…
METAL GROUPSGOLD IN QUARTZEXTRACTING GOLDMETALLIC PROPERTIESALLOYSFIND OUT MOREAlmost three-quarters of all elements are metals, such as gold and silver. There are also some elements we may not…
(Encyclopedia) MesabiMesabiməsäbˈē [key], range of low hills, NE Minn., once famous for its extensive iron ore deposits. The ores were found in a belt c.110 mi (180 km) long and from 1 to 3 mi (1.6–4…
(Encyclopedia) flotation process, in mineral treatment and mining, process for concentrating the metal-bearing mineral in an ore. Crude ore is ground to a fine powder and mixed with water, frothing…
