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[AlanBoyd]

It seems likely that your grandfather worked at the Morfa Colliery which was situated about 2 miles to the south, in the area of the steelworks. The colliery served the Taibach Copper Works, and both were owned by the Vivian Company.

The South Wales Daily News of March 13th 1890 has an article about an inquest following  "The Morfa Disaster" in which 88 men died. This seems to have been an explosion resulting in an extensive roof fall followed by a fire. The majority of the men who died were from Taibach, and in the list published in the article I can see nine whose address is given as "Constant". One of the dead was David Brownsell, 35, Constant, married (one of the explorers). [One of the men who went in after the initial event to rescue the victims.] His body was identified by Evan Williams, Constant-row, Taibach.

Constant Row was probably built and owned by the Vivian company.

There is a list of the victims here:

http://www.welshcoalmines.co.uk/deathrolls/Morfa.htm#Morfa1890