| 1932 May. |
Founded Mochikoshi Mine Co., Ltd. (Capital 1.50 million yen). |
| 1936 Apr. |
Three companies such as Yakumo Mining Co., Ltd. were merged, and company name changed to Chugai Mining Co., Ltd. |
| 1949 May. |
Listed on the Tokyo Stock Exchange. |
| 1951 Oct. |
Listed on the Osaka Stock Exchange. |
| 1957 Feb. |
Listed on the Niigata Stock Exchange (acquired and consolidated into the Tokyo Stock Exchange) |
| 1973 May. |
Established gold and silver recycling facilities atMochikoshi Mine, and commenced the metal refinement business （recycling of the precious metals）. |
| 1979 Sep. |
Opened Osaka Sales Office. |
| 1986 May. |
Closed Jokoku Mine. |
| 1987 May. |
Closed Seigoshi Mine. |
| 1987 Jun. |
Ceased operations of Tsumo Mining Co., Ltd. |
| 1987 Nov. |
Commenced the business in the real estate and gold plating fields. |
| 1989 Mar. |
Completed incineration facilities and alkaline recycling facilities at Mochikoshi Plant. |
| 1991 Jan. |
Established Kofu Analysis Center in Yamanashi Prefecture. |
| 1995 Jan. |
Established Chugai Chemicals Co., Ltd. |
| 1996 Mar. |
Acquired shares in Intex Co., Ltd. (currently a consolidated subsidiary). |
| 1997 Oct. |
Intex Co., Ltd entered into the machinery business. |
| 1999 Jul. |
Opened Nagoya Sales Office in Aichi Prefecture. |
| 1999 Jul. |
Established IR Center. |
| 2000 Nov. |
Established Chugai Capital Co., Ltd. (now Career Mate Co., Ltd.) |
| 2001 May. |
Completed new platinum and palladium facilities at Mochikoshi Plant. |
| 2002 Nov. |
Opened Okachimachi Branch. |
| 2005 Jul. |
Placement of Internal auditor’s office |
| 2005 Aug. |
Tokyo factory newly constructed and start. |
| 2006 Aug. |
Opened Okachimachi Minamiguchi Branch. |
| 2007 Mar. |
Opened Shinjuku Nishiguchi Branch. |
| 2007 Jun. |
Opened Fukuoka Branch. |
| 2007 Nov. |
Opened Ginza Branch. |
| 2008 Feb. |
Opened Gotanda Branch. |
| 2008 Jul. |
Changing division name from “Metal Refining Division” to “Precious Metal Division”. |
| 2009 Feb. |
Opened Sendai Branch. |
| 2009 Apr. |
Opened Nakaokachimachi Branch. |
| 2011 Feb. |
Opened Shinokachimachi Branch. |
| 2011 Oct. |
Opened Yokohama Branch. |
| 2012 Apr. |
Established Energy Recycling Business Division. |
| 2014 Sep. |
Discontinued Energy Recycling Business. |
| 2015 Mar. |
Opened Omiya Branch. |
| 2015 May. |
Established Contents Business. |
| 2017 Mar. |
Opened Shinagawa Branch. |
| 2017 Nov. |
Opened Real Estate Business Okachimachi Branch. |
