[Answer] Which ore minerals are commonly found in ancient sedimentary deposits that are two billion years old?

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

Sun Aug 17 2003 14:30:00 GMT-0400 (Eastern Daylight Time) · The oldest rocks (laid down 2.97 billion years ago) form the northern scarp of the Witwatersrand plateau; the youngest (laid down 2.71 billion years ago) are those that form the southern edge of the plateau. Gold is found in the conglomerate strata of the younger members of the Supergroup locally referred to as banket. The abundance of this gold …

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 …

Banded iron formation – Wikipedia

Geology of Massachusetts – Wikipedia

Witwatersrand – Wikipedia

Uranium mining – 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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