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Mine Exploration Forum

Author Poor air in Scaleburn
gNick

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Poor air in Scaleburn
Posted: 01/10/2017 20:50:30
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Just a quick warning, I was up in Scaleburn today and the oxygen level was a tad low, down around 17-18% in the Whimsy chamber. I found out when dropping one of the sumps and the meter alarm went off at 16.5% at about 8m down. I didn't get anything lower than 16.2% but I did get back out fairly quickly.
Be warned!

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Steetleysurfer

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Poor air in Scaleburn
Posted: 01/10/2017 20:57:42
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Thanks for sharing! IP: 85.255.232.57
John Lawson

Joined: 09/12/2010
Location: Castle Douglas Dumfries & Galloway

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Poor air in Scaleburn
Posted: 01/10/2017 21:08:04
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Hi Nick,
When we opened up, Scaleburn Vein, I am pretty sure, from memory, that the air in the whim chamber, was around 20%.
As I am in the Irish Republic at the minute I am not able to access our original data.
Also at that time the oil drum,allowed access to the workings beyond, and I remember a draft coming through it.
As this is now blocked, it could be the reason for this drop in 02, content.
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Steetleysurfer

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Poor air in Scaleburn
Posted: 01/10/2017 21:49:54
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The oil drum isn't blocked.
Neither are the digs beyond it.
Was there just last week.
Zero air movement though.
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John Lawson

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Poor air in Scaleburn
Posted: 01/10/2017 22:59:35
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Thanks for the update- steetleysurfer,
When I was last in there our oildrums were blocked and there was no easy way on!
Not that getting through these oildrums was easy! We had put in one complete one, and clearly it needed another, so I cut a 2inch strip off a spare one I had, and we took into the mine, expecting it to fit neatly inside the other one, however, it was the same size!
So the only way to make it work was to not, tighten up the bolts I had for the reassembled drum, on one side of it. This then meant the assembled entity could bend on the inbyeside with pressure, and eventually this happened.
Incidentally the next dig after the oil-drum is Roy's dig!
So called because he dug it out himself, and the group, just 'retarted' up his work.
When you went through the next dig beyond Roy's our Brummy friend put up Union Flag to celebrate.
Is it still there?
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gNick

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Poor air in Scaleburn
Posted: 01/10/2017 23:39:24
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For what it's worth, the inner drum has been bent in on the inbye side, not blocking but significantly obstructing any air movement.
It might be worth a bit of effort to dig out the drum dig to make it bigger, safer and more air friendly. :-)

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John Lawson

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Poor air in Scaleburn
Posted: 02/10/2017 21:46:07
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Hi Nick,
Great to see you back on AN, yes an appraisal of this entrance section might improve the air flow.
It was the far end's poor air which stopped us from going further with this dig, when I return will upload the O2 figures I measured then.
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John Lawson

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Poor air in Scaleburn
Posted: 08/10/2017 20:22:30
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Hi as promised figures taken by us, 26.9.93,
Showed the main H.L. to contain 20.8% O2
The horse whim flat to have 20.4 -20.5% O2
At the oil drum it was 20.3% O2
Inbye of Roy's dig. 19.8% O2
It then fell gradually, to the
so at the final fall it was only 16.9% O2,
As you can see either there has been a significant deterioration or, when you measured it, Nick it was a definite, low pressure day.
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gNick

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Poor air in Scaleburn
Posted: 08/10/2017 21:28:11
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It was 20.9 or so at the drum dig on Thursday evening so must have been a bad air day Smile

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John Lawson

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Poor air in Scaleburn
Posted: 09/10/2017 19:26:13
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Nick, thanks for the O2 update.
As I suggested it would appear that the air in this mine is very weather dependant.
I had noticed this in Rampgill itself, but have not made any O2 measurements.
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legendrider

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Poor air in Scaleburn
Posted: 09/10/2017 20:21:19
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Lets explore that O2 content a bit more.

Nenthead is 1450ft ASL. Given that atmospheric pressure drops by 1mb per 30ft, and standard sea level pressure is 1013mb, atmospheric pressure at altitude is 1013-(1450/30) = 965mb or 95.2% of the sea-level pressure.

An O2 meter will read %volume but this wont take into account the ambient pressure, which does have a significant effect!

Although the volume proportion of O2 remains largely constant (20.8%vol) throughout the lower atmosphere, the partial pressure of O2 at Nenthead has reduced to 95.2% of that at sea level, ie 19.7%

So, your 16.2% overreads by a factor of 5% giving only 15.4% sea-level equivalent. If the atmospheric pressure is low, say 980mb, you can easily lose another 0.5% equivalent

A Himalayan holiday will help you acclimatise to low O2 levels!

MARK

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gNick

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Poor air in Scaleburn
Posted: 09/10/2017 20:39:55
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So I could have been down to an equivalent of about 15% at sea level, I'm glad that you didn't tell me this at the time...

My thought is that if the ambient pressure is falling, then poor air with low oxygen levels is being pulled in from workings with much worse air such as beyond the drums on the horse level or above and below.
Once we got back to the steps, the oxygen was back to normal which is what you would expect given the through connection with Brownley Hill.

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