An underground gas explosion kills fifty-three miners in the Middelbult coal mine at Secunda, 100 km from Johannesburg.

South African History Online. (2012, May 11). An underground gas explosion kills fifty-three miners in the Middelbult coal mine at Secunda, 100 km from Johannesburg.. South African History Online. https://sahistory.org.za/ref/E-0083186

South African History Online (2012) 'An underground gas explosion kills fifty-three miners in the Middelbult coal mine at Secunda, 100 km from Johannesburg.', South African History Online, 11 May. Available at: https://sahistory.org.za/ref/E-0083186 (Accessed: 9 August 2026).

South African History Online, An underground gas explosion kills fifty-three miners in the Middelbult coal mine at Secunda, 100 km from Johannesburg. [website], https://sahistory.org.za/ref/E-0083186, (accessed 9 August 2026).

"An underground gas explosion kills fifty-three miners in the Middelbult coal mine at Secunda, 100 km from Johannesburg.." South African History Online, 11 May 2012, https://sahistory.org.za/ref/E-0083186. Accessed 9 Aug. 2026.

South African History Online. "An underground gas explosion kills fifty-three miners in the Middelbult coal mine at Secunda, 100 km from Johannesburg.." South African History Online. May 11, 2012. https://sahistory.org.za/ref/E-0083186.