I think this is what it means-- blasting through a furnace.

*

Low confidence level as anything but a specialist in the matter, more just a question of relaying findings which might help if you are a specialist!


http://www.termium.com/tpv2alpha/alpha-fra.html?lang=fra&src...

coyote hole blasting, tunnel blasting, gopher hole blasting



http://www.answers.com/topic/coyote-blasting
(′kī′ōd•ē ′blast•iŋ)
(mining engineering) A method of blasting in which large charges are fired in small adits or tunnels driven at the level of the floor, in the face of a quarry or the slope of an open-pit mine. Also known as coyote-hole blasting; gopher-hole blasting; heading blasting.


Read more: http://www.answers.com/topic/coyote-blasting#ixzz1jo8UTzNq


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Note added at 21 hrs (2012-01-18 14:49:22 GMT)
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Actually, I originally ignored these posts as I know nothing of the field. Seeing that you'd had little help, except with this term, I decided to start snooping around.

If you have knowledge, then maybe this soucre may help :

http://www.nps.gov/history/history/online_books/npsg/explosi...



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Note added at 21 hrs (2012-01-18 14:50:38 GMT)
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http://www.austinpowder.com/blastersguide/resources/Glossary...

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Note added at 21 hrs (2012-01-18 14:53:33 GMT)
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http://www.theresourceinvestor.com/RI-archive/gloss-mine.htm...

And last but not least :

http://en.wiktionary.org/wiki/Appendix:Dictionary_of_Mining,...