Project 596
Project 596 (Miss Qiu, Chinese: 邱小姐; pinyin: Qiū Xiǎojiě, as the callsign; Chic-1 by the US intelligence agencies) was the first nuclear weapons test conducted by the People's Republic of China, detonated on 16 October 1964, at the Lop Nur test site. It was an implosion fission device containing about 15 kg weapons-grade uranium (U-235) from Lanzhou enrichment plant.