Congo

Columbite-tantalite coltan for short is a dull metallic ore found in major quantities in the eastern areas of Congo. When refined, coltan become

Gold in the native state (i.e. found naturally) is usually mixed with other metals, such as silver. Its purity can be increased by depletion guilding

Diamond 1 The ancient Romans and Greeks believed that diamonds were tears cried by the gods or splinters from falling stars, and Romans believed that

Mica is a mineral name given to a group of minerals that are physically and chemically similar. They are all silicate minerals, known as sheet silicat

The copper cathode market can be segmented based on refining process type, application, and region. Copper cathode is produced through the refining pr

Diamond 1 The ancient Romans and Greeks believed that diamonds were tears cried by the gods or splinters from falling stars, and Romans believed that