การทำเหมืองแร่รัตนชาติและกึ่งรัตนชาติ

QUARTZ INDUSTRY CORPORATION LIMITED

EMINENT ADVISORY COMPANY LIMITED

PUTEP LIMITED

T.C.A. MINING CO.,LTD.

C.P.S.S. COLOR STONES CO., LTD.

SIAM FEWEL MINING (1988) CO., LTD.

P.V.S. RESORGES COMPANY LIMITED

THAI - AUSTRALIAN MINING CO., LTD.

S.M. SAPPHIRE COMPANY LIMITED

D.R.K INTERNATIONAL CO., LTD.

XINTAIYUAN (THAILAND) CO., LTD.

S. K. MINING (1976) COMPANY LIMITED

RAYONG COPPER INDUSTRY CO., LTD.

JL QUARTZ COMPANY LIMITED

PRASOPSOOKCHOKMANEE MUANGPLOY COMPANY LIMITED