China established Plant 905 in 1965 as part of its “Third Line” of facilities, an effort to diversify and protect its nuclear infrastructure in the event of war.[1] It is China’s main research and production site for beryllium.[2] Plant 905 is now a part of the China Nonferrous Mining Corporation (CNMC) Ningxia Orient Group Co., Ltd, a subsidy established under the China Nonferrous Metal Mining Group Co., Ltd in 2008.[3] The subsidy company is now China’s largest producer of tantalum, niobium and beryllium.[4]

Sources:
[1] “贺兰山下的蜕变 [The Transformation Beneath the Helan Mountains],” Keji Ribao, 12 April 2010, via: www.cnmc.com.cn.
[2] Rodney Jones and Mark McDonough, Tracking Nuclear Nonproliferation (Washington, D.C., Carnegie, 1998), p. 67.
[3] “公司简介 [Brief Introduction to the Company],” China Nonferrous Mining Corporation, www.cnmnc.com.
[4] “贺兰山下的蜕变 [The Transformation Beneath the Helan Mountains],” Keji Ribao, 12 April 2010, via: www.cnmc.com.cn.