Why are the mineral resources in South America distributed along the coast? Amazon Plain is a tropical rain forest, which is difficult to survey and understand, but why is the Brazilian Plateau sparse

Why are the mineral resources in South America distributed along the coast? Amazon Plain is a tropical rain forest, which is difficult to survey and understand, but why is the Brazilian Plateau sparsely distributed? Except for some Inca natives, most of the population in South America comes from the descendants of European immigrants and African slaves. After these immigrants came to South America, they were mainly distributed in coastal areas, so there were many explorations and many minerals were discovered in these areas.

However, Brazil is not short of resources. The following information is for your reference:

Brazil has proven iron ore reserves of 33.3 billion tons, accounting for 9.8% of the world's total reserves, ranking fifth in the world; The output is 355 million tons, ranking second in the world; Exports are also among the highest in the world. Brazil is rich in 29 kinds of minerals, nickel accounts for 98% of the world's total reserves, and metals such as manganese, bauxite, lead and tin account for more than 10% of the world's total reserves. The proven reserves of niobium ore are 4.559 million tons, which can be used worldwide for 800 years according to the current consumption. In addition, there are abundant chrome, gold and asbestos mines. The proven reserves of coal mine are1010 million tons, but the grade is very low.

Brazil Plateau is not only an important producing area of Brazil's agriculture and animal husbandry, but also rich in iron, manganese, diamonds and other mineral deposits. The plateau is particularly rich in mineral resources, including iron, manganese, lead, zinc, chromium, nickel, tin, timely crystal, mica and other minerals. Among them, the "Four Corners of Iron Mine" centered on Itabila is a world-famous large-scale iron mine with high quality. There is a large area of lava on the parana river Valley Plateau south of 20 south latitude.