- YNP and DM
- Address:Yeoksamdong
- Uljin Tin Mining Co.,LTD
- Address:880-6 Uljin-eup
- Samhwa Metal Co., Ltd.
- Address:267,Palbokdong 2-ga ,Deokjin-gu, Jeonju-si
- DUCKSUNG CO LTD
- Address:Chaesin-Dong 588
- meijia international co.ltd
- Address:
- Yoon Gun Metals Ltd
- Address:29-203 Bonri-ri, Nonkong-eup
- ShinPyung Metal co.Ltd.
- Address:201. 777-6 Wonsi-dong, Danwon-gu
- POSCO
- Address:POSCO Center, 892 daichi4-dong,
- DS METAL CO.,LTD
- Address:
- STC Ltd.,Korea
- Address:Jangwon Greenvil 101, # 774-16, Bumeo 1 Dong, Su Sung Ku
- Dong Ha Co., Ltd.
- Address:20, BULDANG9-GIL SEOBUK-GU,
- OZ mnt co.,Ltd
- Address:Rm 903 KOLONdigitaltowerbilllant Guro-Dong
- Korea Nickel Corporation
- Address:YONGPUNG B/D,142, Nonhyeon 1-dong ,Gangnam-gu
- Bokyung international
- Address:Amnan-dong
- General Plumbum
- Address:48 Yeouido-dong
- Solar Hub., Co. Ltd.
- Address:# 1207 Taeheung Bldg. Myung-dong Jung-gu
- Sang Shin Metal Co., Ltd.
- Address:402-2, 4 MA, SHIHWAJIGU, Seonggok-dong ,Danwon-gu, Ansan-si
- Samsun Logix
- Address:5th Fl. LeeMa Bldg. , 146-1 Soosong Dong, Jongno-Gu
- Dooin Cooperarion
- Address:1108, Hwanghwa Bldg 832-7, Yeoksam-Dong
- JSMCO
- Address:761-2, Saengnim-ri, Saengnim-myeon