|
|
Post by John on Apr 20, 2016 16:37:31 GMT -5
Was ANFO a permitted explosive in coal mines, my own guess is no.
|
|
|
|
Post by Wheldale on Apr 20, 2016 16:42:00 GMT -5
Was ANFO a permitted explosive in coal mines, my own guess is no. i wondered if it was allowed in hard rock were there was no coal seams present? In a cross measure drift? |
|
|
|
Post by John on Apr 22, 2016 10:40:23 GMT -5
Was ANFO a permitted explosive in coal mines, my own guess is no. i wondered if it was allowed in hard rock were there was no coal seams present? In a cross measure drift?
We used ANFO in gypsum for a while, but it did cause cracking in the roof, in a mining environment it is a powerful explosive, ie in shot holes.
I recall coal mining explosives had some type of salt added to make it a "cooler" explosion to help prevent gas and dust ignitions, ANFO doesn't have those additives.
There is a video on Youtube at an open cut coal mine in the US where they use ANFO, and it clearly shows a violent coal dust ignition when the shots were fired.
I was hoping one of our ex UM's or Deputy's would have dropped in to answer this one. |
|
|
|
Post by smshogun on Jun 18, 2016 19:30:05 GMT -5
ICI Nobel was ANFO and was the preferred explosive in coal mines and was the most prolific as it was essentially a poor explosive as it had a slow burn rate, having a slow burn rate meant it didn't just blow stemming up the gate as it built up pressure slowly in the shot holes and cracked the rock more effectively than a faster burning explosive which would just blow the stemming out.
|
|
|
|
Post by tina89 on Jul 15, 2017 4:00:48 GMT -5
I agree with you.
|
|
