Rick
Suggest that you use
1) Hammer and steels with 2 men
2) Multiple holes - say 4-5
3) Might be easier to use dynamite, detonator and safety fuse which was in common use by the 1880's. You could use stemming as it will add to the film effect though in practical terms it is a waste of time when using a high explosive. We have a supply of dynamite (er - yes - dummy) which I can let you have.
Tony Brooks
King Edward Mine Museum
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