CHAPTER 25:

Nonmetallic minerals.

CHAPTER 26:

Ores, slag, ash.

CHAPTER 28:

Chemical elements and compounds.

CHAPTER 31:

Fertilizers (mineral or chemical fertilizers (nitrogenous, phosphatic and potassic)).

CHAPTER 32:

Pigments and other preparations.

CHAPTER 68:

Articles of stone, plaster, cement, asbestos, mica, or similar materials.

CHAPTER 69:

Ceramic products (bricks, blocks tiles of siliceous fossil materials).

CHAPTER 71:

Precious or semi-precious stones, precious metals.

CHAPTER 72:

Iron and steel.

CHAPTER 74:

Copper.

CHAPTER 75:

Nickel.

CHAPTER 76:

Aluminum.

CHAPTER 78:

Lead.

CHAPTER 79:

Zinc.

CHAPTER 80:

Tin.

CHAPTER 81:

Other base metals.

OTHER:

Residues and tailings which may be processed for their metal, non-metal or mineral content.