Ores

Examples

• Valuable metallic ores, such as those of gold, platinum, tin, copper and iron, often occur in the form of sand or mixed with that substance. Various. The Wonder Book of Knowledge.
• This process is best adapted to what are known as free milling or porous ores, where the gold is free and very fine and is attracted readily by mercury. William Henry Doolittle. Inventions in the Century.
• In the treatment of iron ores, and especially those of low grade, the magnetic concentrator is an interesting and striking departure. Edward W. Byrn. The Progress of Invention in the Nineteenth Century.
• Some chemical and other processes for reducing ores have been referred to in the Chapter on Metallurgy. William Henry Doolittle. Inventions in the Century.
• For many years it had been a much-discussed question how to make these ores available for transportation to distant furnaces. Frank Lewis Dyer. Edison, His Life and Inventions.
• Many attempts had been made in by-gone days to concentrate the iron in such ores by water processes, but with only a partial degree of success. Frank Lewis Dyer. Edison, His Life and Inventions.
• By the cyanide process, in which cyanide of potassium is used as a solvent for the gold, low-grade ores can be profitably worked. Various. The Wonder Book of Knowledge.
• Granite is not rich in mineral ores. Various. The Wonder Book of Knowledge.
• Cur ie examined at the same time the salts of uranium and a number of uranium ores. Walter Libby. An Introduction to the History of Science.
• The try everything spirit of Edison's method is well illustrated in this early period by a series of about sixteen hundred resistance tests of various ores, minerals, earths, etc. Frank Lewis Dyer. Edison, His Life and Inventions.
• The chief of machines with _ores_ is the _ore mill_, which not only breaks up the ore but grinds or pulverises it. William Henry Doolittle. Inventions in the Century.
• This crusher consists of two ponderous upright jaws, one fixed and the other movable, between which the stones or ores to be crushed are fed. William Henry Doolittle. Inventions in the Century.
• Iron, which seems to have been first reduced from its ores by the Hittites, was, to begin with, a rare and much-desired substance. H. G. Wells. The Outline of History_Being a Plain History of Life and Mankind.
• Seventeen different methods and devices for separating magnetic ores. Frank Lewis Dyer. Edison, His Life and Inventions.
• As to gold, silver and lead, they doubtless were found first in their native state and mixed with other ores and were hammered into the desired shapes with the hardest stone implements. William Henry Doolittle. Inventions in the Century.
• To pay railroad charges on ores carrying perhaps 80 to 90 per cent. Frank Lewis Dyer. Edison, His Life and Inventions.

Editor: Vince