1. Ore minerals are composed of psilomelane, pyrolusite, braunite, rhodochrosite and manganocalcite and gangue minerals are composed of magnetite, goethite and pyrite and so on.

2. The mineral components of nodules are mainly pyrolusite, psilomelane and limonite.

3. Main metallic minerals in the manganese-silver concentrate were psilomelane, pyrolusite , pyrite, limonite, and a few arsenopyrite, hematite and sphalerite.

4. The main silver-bearing minerals were psilomelane, pyrolusite, limonite, galena, pyrite and sphalerite.

5. Silver occurred in form of minerals in the cryptomelane, coronadite, psilomelane with minor silver absorbed in the manganese minerals.

6. It is studied that most of tungsten in ore occurs in secondary psilomelane in the form of adsorbed ions.