Answer: iron oxides
Which ore minerals are commonly found in ancient sedimentary deposits that are two billion years old?

Often placer deposits are found within sedimentary rocks and can be billions of years old for instance the Witwatersrand deposits in South Africa. Sedimentary placer deposits are known as 'leads' or 'deep leads'. Placer deposits are often worked by …

There are three of types of sulfide ore that can be found in these mineral deposits. Stringer ore quartz-chalcopyrite-pyrite veins are prominent at the stratigraphic base of the ore. Massive sulfide ore locally shows primary stratiform features such as lamination and grading. Breccia ore is …

Banded iron formation - Wikipedia

Geology of Massachusetts - Wikipedia

Witwatersrand - Wikipedia

Ore genesis - Wikipedia

Phosphorite phosphate rock or rock phosphate is a non-detrital sedimentary rock that contains high amounts of phosphate minerals .The phosphate content of phosphorite (or grade of phosphate rock) varies greatly from 4% to 20% phosphorus pentoxide (P 2 O 5).Marketed phosphate rock is enriched ("beneficiated") to at least 28% often more than 30% P 2 O 5.This occurs through washing screening ......


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