Post Blast Proceedure· Page 2 · AditNow Community

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Ty Gwyn
50.2% (Neutral)
Newbie

12 years ago

#21

Hi Lozz,
Thanks for the explanation,strange for the Granite to reform as you say,i find that hard to visualise,but hey,you worked there,not me.

Regarding these sockets,sometimes we would have short ones left after firing down a top hole,but placing the rammer in this socket,and ramming,would tell if there was any powder left in there,by the sound,wood on rock is different to wood behind a stick.

lozz
50.2% (Neutral)
Newbie Topic Starter

12 years ago

#22

"Ty Gwyn" wrote:
Hi Lozz,
Thanks for the explanation,strange for the Granite to reform as you say,i find that hard to visualise,but hey,you worked there,not me.

Regarding these sockets,sometimes we would have short ones left after firing down a top hole,but placing the rammer in this socket,and ramming,would tell if there was any powder left in there,by the sound,wood on rock is different to wood behind a stick.

So far as I remember it was explained to me back then, it was 40 years ago though I think it was something to do with small particles of the rock exploding and imploding as it were due to the shock wave from an adjacent hole, sometimes the granite was not hard like tombstone granite but was partly decomposed, I think it was the feldspars in the granite that decomposed, the term down here for that soft granite was "pot" granite, a product of that type of granite is Kaolin, Kaolin is the basis of the china clay industry down here which is used for making porcelain crockery amongst other things hence the word "pot"
I guess in all of this then all risks connected with blasting need to be assesed.

Any one know if ANFO powder is still used in UK mines?

Lozz.

scooptram
50.2% (Neutral)
Newbie

12 years ago

#23

was still useing ANFO when i was at crofty bout 3 years ago ,when i was in Greenland we used to make our own bloody s**t job miles from the mine -stupid temps and no heat or kettle you would come back to camp like a ice pop and stinking of diesel

lozz
50.2% (Neutral)
Newbie Topic Starter

12 years ago

#24

"scooptram" wrote:
was still useing ANFO when i was at crofty bout 3 years ago ,when i was in Greenland we used to make our own bloody s**t job miles from the mine -stupid temps and no heat or kettle you would come back to camp like a ice pop and stinking of diesel

Were you mining in Greenland?

Lozz.

Buckhill
50.2% (Neutral)
Newbie

12 years ago

#25

"lozz" wrote:
Any one know if ANFO powder is still used in UK mines?

Lozz.

Last place I heard using it was gypsum mine at Kirby Thore. Don't know if they still do but hearing about it gave guy I worked for 10 years ago notion to try it out. If he had I would have been out of there...well, like a shot... He was like some mentioned earlier, any det in any hole, 8 ft holes with one stick in back (to try and save money!!!....guess what happened..and who had to sort it out for him).

lozz
50.2% (Neutral)
Newbie Topic Starter

12 years ago

#26

Thanks.

Lozz.

scooptram
50.2% (Neutral)
Newbie

12 years ago

#27

yea was in Greenland mining for 2 years

lozz
50.2% (Neutral)
Newbie Topic Starter

12 years ago

#28

"scooptram" wrote:
yea was in Greenland mining for 2 years

Minerals? Would imagine it's cold, what's the local talent like....?

Lozz.

scooptram
50.2% (Neutral)
Newbie

12 years ago

#29

was mining gold :lol: as for the local talent 3 mtrs high, white fur,big sharp teeth and they like eating live food :lol: :lol:

lozz
50.2% (Neutral)
Newbie Topic Starter

12 years ago

#30

"scooptram" wrote:
was mining gold :lol: as for the local talent 3 mtrs high, white fur,big sharp teeth and they like eating live food :lol: :lol:

Sounds like the ones up at Porcupine Lake only they were $10 a session....
You ought to write a bit about it, UG or pit?

Lozz.

Manicminer
50.2% (Neutral)
Newbie

12 years ago

#31

"lozz" wrote:
Yes, we were on contract as well, per fathom, we used either 5 or 9 hole cuts, the center on a five hole cut was reamed as free, can't remember exactly which was the free hole(s) on a nine hole, cut would you or anyone know?
Lozz.

On the 9 hole cut we used a '0' on the centre hole, a '1' in the 2 holes in the corner opposite each other on the grain of the bedding and a '2' in the other two corner holes that cut across the bedding grain. The other holes were left empty 'e'.
1-e-2
e-0-e
2-e-1

All drilled parallel

Gold is where you find it

lozz
50.2% (Neutral)
Newbie Topic Starter

12 years ago

#32

"Manicminer" wrote:

"lozz" wrote:
Yes, we were on contract as well, per fathom, we used either 5 or 9 hole cuts, the center on a five hole cut was reamed as free, can't remember exactly which was the free hole(s) on a nine hole, cut would you or anyone know?
Lozz.

On the 9 hole cut we used a '0' on the centre hole, a '1' in the 2 holes in the corner opposite each other on the grain of the bedding and a '2' in the other two corner holes that cut across the bedding grain. The other holes were left empty 'e'.
1-e-2
e-0-e
2-e-1

All drilled parallel

Thanks for that, yes we did parallel, did you use wooden spacers? we did but that was the drillers descision, I was the mate, can't quite remember how they determined when spacers were need, maybe on a 9 hole but not on a center reamed 5 hole? Anyone know?
The wooden spacers were approx three quarter inch square by the length of a stick 'o dynamite.

Lozz.

Manicminer
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Newbie

12 years ago

#33

We charged the cut and box to within 18 inches of the collar of the hole and only used spacers on the side holes so that they wouldn't overblast the sidewalls and roof. We drilled the cut holes 5 inches apart. Some lads used to drill them closer and they would 'freeze' and the whole round was left in place when you went back. Maybe you used spacers to stop this?
On the side and roof holes we would put the primer in and then either another one or two gel sticks depending on how hard the rock was and then one stick equivalent of spacer then 1 stick gel etc until the required length of the hole was charged.

Gold is where you find it

lozz
50.2% (Neutral)
Newbie Topic Starter

12 years ago

#34

"Manicminer" wrote:
We charged the cut and box to within 18 inches of the collar of the hole and only used spacers on the side holes so that they wouldn't overblast the sidewalls and roof. We drilled the cut holes 5 inches apart. Some lads used to drill them closer and they would 'freeze' and the whole round was left in place when you went back. Maybe you used spacers to stop this?
On the side and roof holes we would put the primer in and then either another one or two gel sticks depending on how hard the rock was and then one stick equivalent of spacer then 1 stick gel etc until the required length of the hole was charged.

Thanks, yes I remember it could freeze up, as you suggest spacers might have stoped that from happening, I am sure that the spacers were used mainly in the cut, the cut holes were pretty close sometimes, you know what rock is like, it's rarely consistant.

Lozz.

scooptram
50.2% (Neutral)
Newbie

12 years ago

#35

was underground well under a bloody big mountin :lol: