Hi Ian,
The 1/24th had been in South Africa from about January 1875 and the 2/24th fought in the 9th Frontier wars 1877-1878 with the 1st and then the Zulu wars. These soldiers had marched over 1000 miles, rooinekers (red necks) they weren't not. I think a lot of them would have been bronzed in some way, but to what degree who can say.
The approx. number of medals issued to the 1st and 2nd battalions with the bars are as follows so you can see the number of combatants and the years in which they fought.
1st battalion "1877-8" (157), "1877-8-9" (526), 1878 (1), "1878-9" (24), "1879" (663)
2nd battalion "1877-8" (55), "1877-8-9" (823), "1879" (163)
Hope this helps some.
cheers
Richie