Precious metals and Minor metals
We recycle waste materials and take minor metals to be utilized into what is called "industry vitamins" that revitalize the manufacturing industry. We propose an efficient use of ﾒurban mines,ﾓ as represented by these reusable natural resources.
It is important to recycle minor metals as industry resources precisely because they are too costly to refine, hard to take out simply, and are limited in reserves, which is why they are dubbed as "industry vitamins". It is essential for the structural metal composition of special steel, semiconductor laser, photocatalysts, plasma display panels, and functional materials of CRT fluorescence. Wasted materials like circuit boards contain reusable precious metals and minor metals, and they are called "urban mines" against natural resources. We collect and recycle these metals from wasted materials and manufacturing runoffs.