there are two mining company. one is in usa and another one in kenya. the composition of the ore is given in the table below. how many tones of ore from each mine should be used to obtain exactly 6 tons of nickel and 8 tones of copper? write the two linear algebraic equations. ( no need to solve )
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The mineral industry of Africa is the largest mineral industry in the world[citation needed]. Africa is the second largest continent, with 11.73 million miles of land, which implies large quantities of resources. With a population of 1.216 billion living there. For many African countries, mineral exploration and production constitute significant parts of their economies and remain keys to economic growth. Africa is richly endowed with mineral reserves and ranks first or second in quantity of world reserves of bauxite, cobalt, industrial diamond, phosphate rock, platinum-group metals (PGM), vermiculite, and zirconium.
The Central African Mining and Exploration Company (CAMEC), one of Africa's primary mining enterprises, is criticized for its unregulated environmental impact and minimal social stewardship. In the spring of 2009, retired British cricket player Phil Edmonds' assets were seized by the United Kingdom's government due to CAMEC's illicit association with former self-appointed Zimbabwean President Robert Mugabe.[citation needed] CAMEC recently sold 95.4% of its shares to the Eurasian Natural Resources Corporation. It is under restructuring and is no longer trading under the CAMEC brand.[1]
African mineral reserves rank first or second for bauxite, cobalt, diamonds, phosphate rocks, platinum-group metals (PGM), vermiculite and zirconium.[2] Many other minerals are present in quantity. The 2012 share of world production from African soil was bauxite 7%; aluminium 5%; chromite 38%; cobalt 60%; copper 9%; gold 20%; iron ore 2%; steel 1%; lead (Pb) 2%; manganese 38%; zinc 1%; cement 4%; natural diamond 56%; graphite 2%; phosphate rock 21%; coal 4%; mineral fuels (including coal) - 13% and petroleum 8%; uranium 18%;[3] and platinum 69.4%.
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