Table:
text: Rhondda
Mining disasters
Mining disasters in the Rhondda Valley 1850 - 1965
Colliery Location_ Date_ Year_ Death_toll cause
Dinas Colliery Dinas 1 January 1844 12 gas explosion
Cymmer Colliery Cymmer 15 July 1856 112 gas explosion
Ferndale No. 1 Pit Blaenllechau 8 November 1867 178 gas explosion
Ferndale No. 1 Pit Blaenllechau 10 June 1869 53 gas explosion
Pentre Colliery Pentre 24 February 1871 38 gas explosion
Tynewydd Colliery Porth 11 April 1877 5 flooding
Dinas Middle Colliery Dinas 13 January 1879 63 gas explosion
Naval Colliery Penygraig 10 December 1880 101 gas explosion
Gelli Colliery Gelli 21 August 1883 5 gas explosion
Naval Colliery Penygraig 27 January 1884 14 gas explosion

text: Rhondda
Mining disasters
Mining disasters in the Rhondda Valley 1850 - 1965
Colliery Location_ Date_ Year_ Death_toll cause
Maerdy Colliery Maerdy 23–24 December 1885 81 gas explosion
National Colliery Wattstown 18 February 1887 39 gas explosion
Tylorstown Colliery Tylorstown 27 January 1896 57 gas explosion
National Colliery Wattstown 11 July 1905 120 gas explosion
Cambrian Colliery No.1 Clydach Vale 10 March 1905 34 gas explosion
Naval Colliery Penygraig 27 August 1909 6 cage fall
Glamorgan Colliery Llwynypia 25 January 1932 11 firedamp
Blaenclydach Colliery Clydach Vale 25 November 1941 7 runaway trolly
Lewis Merthyr Colliery Trehafod 22 November 1956 9 gas explosion
Cambrian Colliery Clydach Vale 17 May 1965 31 gas explosion

Question: When is there a gas explosion, a death toll less than 63, and a Penygraig location in Rhondda?

Question: Where is a cause of a gas explosion, a death toll of more than 38 on June 10 under Rhondda?