Question

Johannesburg is known for the mining of which of the following minerals?

Answer 1

Hint: Before answering this question, we should know what mining is. The process of extraction of valuable minerals or materials from the earth is known as mining. There should be a proper study done to perform mining. One should have geological knowledge and be ready for a lot of capital investment.

Complete answer:
Johannesburg is known for the mining of the mineral “Gold”.
What is gold?
It is a soft, bright, dense, soft, malleable, and ductile metal which is yellow when present in mass but it converts into black, purple when finely divided. It is one of the most malleable and ductile metals. If 28 g of gold is taken it could be beaten into 300 square feet. This metal is mined and then given to us as gravels or quartz veins or pyrite deposits.
Properties of gold:
This metal is a good conductor of heat and electricity, so it is not affected by most reagents.
It is corrosion resistant and is present in the deposits of alluvium and veins.
Chloroauric acid and auric chloride are some common gold compounds.
It is alloyed with another metal to be more strengthened.

Note:
Uses of gold:
It is used in the manufacturing of jewelry, glass, and different parts of electronic items. Gold also helps in embroidery, it can be made into thread. It is also used on the windows of a large building for reflecting the heat of sun rays, only a thin layer of gold is used. It is a radioactive isotope Au-198 which is used to treat the tumor and also used in medicine.