It's poor quality and not all the copper can be extraxted from it
Copper rich ores contain Relatively large amount of copper. Copper obtained from rich ores is from better quality than low-grade ores. A low-grade ore doesn't contain very high proportion of valuable copper
Ores are refined to produce manufacturing grade metals and chemicals for consumer use.
The metal (copper) extracted may be generally brittle and break easily.
Copper rich ores contain Relatively large amount of copper. Copper obtained from rich ores is from better quality than low-grade ores. A low-grade ore doesn't contain very high proportion of valuable copper
1000 dollars
It's an ore that doesn't contain a very high proportion of valuable minerals. The term could also be applied to richer ores containing large amounts of undesirable impurities, arsenic for example. Low-grade ores are less valuable than higher-grade ones. Also, recovery rates for low grade ores tend to be lower than for high grade ores - that is, a lower percentage of the total amount of metal in the ore is extracted successfully. The definition of low-grade depends on the resource in question. For copper, low grade ores have less than 1% copper. For gold, an ore having 1% gold by mass would be considered (very) high-grade, as gold is more valuable than copper.
I don't know!;p
Elena Ivanovna Sokolova has written: 'Physicochemical investigations of sedimentary iron and manganese ores and associated rocks' -- subject(s): Analysis, Iron ores, Manganese ores
The metal (copper) extracted may be generally brittle and break easily.
In some special circumstances Igneous rocks host important mineral deposits (ores): for example, tungsten, tin, and uranium are commonly associated with granites and diorites, whereas ores of chromium and platinum are commonly associated with gabbros.
Actinium exist in minute traces associated with uranium or thorium ores.
Cadmium is associated with zinc, lead and copper ores - as cadmium sulphide, CdS.