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PostPosted: Wed Jun 25, 2008 10:41 am 
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Location: Central Ohio
It would be difficult to do since there is an open shaft. No place for the public to park. We always agree to keep structures in their places but in theis case it will be more than likely torn down that is why we are trying to at least save it.

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PostPosted: Wed Jun 25, 2008 10:09 pm 
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Location: From Schuylkill County, PA living in Phoenix, AZ
I was looking at the Springdale shaft opening the other day. They have railroad rails over it so no one will fall in.

Anyone know it's depth?

M.T.

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PostPosted: Thu Jun 26, 2008 12:59 am 
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Location: Central Ohio
We know the rail is on top of the shaft. We don't know the exact depth but the hoist isn't that big to be very deep. All the mines in that area have water in them for the shaft types.

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PostPosted: Thu Jun 26, 2008 7:09 am 
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Location: Within 60 Miles of the Northern Anthracite Field
not sure of the formula, but the height of the headframe is relative to the depth of the shaft. thats why out west those 8000 foot deep shafts have real tall headframes. id guess springdale is only a few hundred feet if that.

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PostPosted: Thu Jun 26, 2008 8:42 am 
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Location: Western PA
that's pretty interesting. i wonder what the relationship is between shaft depth and headframe height and why.

obviously, the deeper you go, the more cable there is to support when the skip or cage is down. this would require a stronger headframe, but not necessarily a taller one.

hmm.....

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PostPosted: Thu Jun 26, 2008 11:07 am 
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Location: Hard coal region, PA
would it have to do with distance of the hoist from the mine opening too.... the deeper the shaft the farther the hoist and the taller the headframe. maybe those two factors together reduce tension...

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PostPosted: Thu Jun 26, 2008 10:25 pm 
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Location: Above the Sterling Hill Mine
The headframe design really has most to do with the location of the hoist house / hoist, angle of the incline of the shaft, and the size of the shaft (IE number of compartments). In general the hoisting cable on a good designed headframe should flow at a 45 degree angle from the hoist to the sheave wheel(s). In the case of Spring Dale shaft where the hoist house is right near the shaft, they would have had to use a lower height head frame to support an optimal angle. If you were to look at like New Leonard shaft in Mount Hope, the power house which contains the hoists is pretty far away from the actual shaft. As a result, the headframe is a much taller one and it has legs which are angled towards the power house to make up for the height of the head frame. Generally these legs would be designed to meet the top of the head frame at 60 degree angle, but in the case of Spring Dale, with a low head frame, this support was not needed.

Miner Greg


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PostPosted: Fri Jun 27, 2008 5:11 am 
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Location: Hard coal region, PA
makes sence for sure...

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PostPosted: Sat Jun 18, 2011 5:39 pm 
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Location: From Schuylkill County, PA living in Phoenix, AZ
I was in Mahanoy City today and stopped by the Springdale Shaft. To my surprise, someone used a torch to remove the hoist operator handles and the depth gauges.

M.T.

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PostPosted: Sat Jun 18, 2011 8:57 pm 
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nice.

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 Post subject: Headframe Height Considerations
PostPosted: Sun Jun 19, 2011 5:34 am 
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Location: New Zealand
Peele's 1941 Mining Engineers Handbook says...
"Headframe Height is fixed by the following factors: elevation of cage landing or skip dump above surface; over-all height of cage or skip or combination of, when in dumping position; and allowance for overwinding.

Overwinding Allowance depends on chiefly on speed of hoisting, type of engine and drum diameter. It is usually specified in terms of drum circumference, but with drums of 20ft or larger dia. and where the ore is discharged to bins or crusher at a considerable height above shaft collar. For speeds under 500ft per min, 8 to 10ft is ample. For high speeds, a clearance of 25ft from rope socket to sheave centre, is rarely exceeded, where the landing is above the ground, and 35ft where the landing is at shaft collar...

Chris
in New Zealand

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