Welcome, Guest
Username: Password: Remember me

TOPIC: Spar Mine (Hendre)

Re: Spar Mine (Hendre) 9 years 1 month ago #2625

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
DSCF3007.JPG



Another extreme close up - the "cliff" is no more than 5mm in height
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2626

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
DSCF3021.JPG



This Feldspar/Calcite crystal is smaller than a penny and is backlit
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2627

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
DSCF3022.JPG


The "flooded" level now the water is dropping with a "new" hole in the wall (taken from the bottom of the gravel incline)
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2628

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
DSCF3028.JPG


DSCF3027.JPG


DSCF3026.JPG


DSCF3024.JPG


When I say "don't move" What I actually mean is.... "DON'T MOVE" !!!!
:P
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2629

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
DSCF3030.JPG


Wet Cave Pearls
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2630

  • JohnO
  • JohnO's Avatar
  • OFFLINE
  • Posts: 314
  • Thank you received: 12
Ian, Your Dry Cave Pearls are very nice, I do like them, indeed :ohmy:
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2632

  • timwatts
  • timwatts's Avatar
  • OFFLINE
  • Posts: 4356
  • Thank you received: 393
enough of the cave pearls (although they do look very nice), wheres the spider?
-
Tim Watts
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2633

  • Marty
  • Marty's Avatar
  • OFFLINE
  • Moody Fucker (somewhat at times a little unhappy)
  • Posts: 522
  • Thank you received: 25
AHEM! You are in a mine so they are mine pearls
nid oes bradwr yn y ty hwn

www.darkplaces.co.uk
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2634

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
martymarty wrote:
AHEM! You are in a mine so they are mine pearls

Although they were found (and created) within a mine, the correct terminology is "cave pearl(s)".

I realise that this may be upsetting for your very sensitive demeanor but may I suggest you take the matter up with the people responsible for the English language (the Anglo-Saxons)- that is, if you can find any left alive :whistle:

;)

Ian
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2637

  • cavefrog
  • cavefrog's Avatar
  • OFFLINE
  • Posts: 563
  • Thank you received: 142
Great pics again Ian, I love the cave pearls, erm and i'm glad the spider pic never made the cut (I had nightmares about a spider last night - no kidding).
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2638

  • Marty
  • Marty's Avatar
  • OFFLINE
  • Moody Fucker (somewhat at times a little unhappy)
  • Posts: 522
  • Thank you received: 25
still gonna kick your ass ..shortstuff
nid oes bradwr yn y ty hwn

www.darkplaces.co.uk
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2639

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
cavefrog wrote:
Great pics again Ian, I love the cave pearls, erm and i'm glad the spider pic never made the cut (I had nightmares about a spider last night - no kidding).

Sadly, no, the spider did not come out - my photographic talents are not yet on par with my peers :S

Sorry you had nightmares but, on the positive side, there are far worse things to ponder over :silly:

Ian
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 month ago #2640

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
martymarty wrote:
still gonna kick your ass ..shortstuff

Heard it all before .. blah blah de la de dah blah .....

:P

Ian
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 week ago #3566

Several questions....
I am puzzled by some of the pictures above as they seem to be taken in a different mine to the Hendre Spar mine I have now explored on several occasions.

Is the level of water now falling at a slower rate? It seems to me that the level dropped at about 10" a week when the water filled the whole lower chamber - a huge volume. But now the water level just reaches the top of the incline, so in theory the water level should fall more rapidly if the rate of drainage volume is constant. But the level of water in the incline does not seem to be going down much at all.

Has anyone measured the depth of the mine from the entrance hole down to the floor level of the lowest level now accessible? Has anyone experimented with an altimeter to measure the depth of mines?

I am intrigued by the thick sticky texture of the clay like mud that now covers the lower level - as shown in one of the pictures above. This is probably formed by the precipitation of very fine particles in the flood water. Has anyone explored the use of this sort of mud as a modelling pottery clay for firing?

Comments welcome...
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 week ago #3567

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
My only comment is with regard to the receding water ....

We do not know why the water is dropping but have "guessed" something may have opened up allowing water to drain.

Assuming that is the case (and it may not be) the water may slow down it's rate of drain as it reaches the escape as the water pressure will fall or, it may become partly plugged with debris slowing it down.

It may not be a "Plug" in any event .....

Additionally, I am not certain the rate is slowing as, from Marty's pictures on facebook, the water has very clearly dropped significantly in the last two weeks (The deepest part where there "party" is stood is only ankle depth and Dylan was wading up to his waist there on my last trip 2/3 weeks ago.

;)
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 week ago #3573

  • timwatts
  • timwatts's Avatar
  • OFFLINE
  • Posts: 4356
  • Thank you received: 393
JohnNicholson wrote:
Has anyone experimented with an altimeter to measure the depth of mines?

yes, - but only the rather crude one thats built into my watch. Obvious potential problem being that in a system where the pressure variations caused by the cooling/warming of areas (i.e. anywhere where you have a draft meaning air moving from a higher pressure area to a lower pressure area) are going to influence the measurement. To add to this humidity changes also play a large part in the equation.

As can be seen from the relationship between p (measured atmospheric pressure) and h (the height in meters above sea level):


p = Po * ( 1- ( (L*h)/To ) ^ ( (g * M)/(R * L) )

Where:
Po = Standard Sea Level atmospheric pressure (101325 Pa)
L = Temperature Lapse rate (0.0065 K/m)
To = Standard sea level temp (288.15 K)
g = acceleration due to gravity 9.81 m/s^2
M = Molar Mass of dry air (0.0289644 kg/mol)
R = Universal Gas Constant 8.31447 J/(mol.K)


In large open mines - like this one - its much more likely to be accurate though :-) And lets face it, the degree of accuracy may/or might not been deemed good enough depending on what you're doing.
-
Tim Watts
Last Edit: 9 years 1 week ago by timwatts.
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 week ago #3574

  • timwatts
  • timwatts's Avatar
  • OFFLINE
  • Posts: 4356
  • Thank you received: 393
TimWatts wrote:
JohnNicholson wrote:
Has anyone experimented with an altimeter to measure the depth of mines?

yes, - but only the rather crude one thats built into my watch. Obvious potential problem being that in a system where the pressure variations caused by the cooling/warming of areas (i.e. anywhere where you have a draft meaning air moving from a higher pressure area to a lower pressure area) are going to influence the measurement. To add to this humidity changes also play a large part in the equation.

As can be seen from the relationship between p (measured atmospheric pressure) and h (the height in meters above sea level):


p = Po * ( 1- ( (L*h)/To ) ^ ( (g * M)/(R * L) )

Where:
Po = Standard Sea Level atmospheric pressure (101325 Pa)
L = Temperature Lapse rate (0.0065 K/m)
To = Standard sea level temp (288.15 K)
g = acceleration due to gravity 9.81 m/s^2
M = Molar Mass of dry air (0.0289644 kg/mol)
R = Universal Gas Constant 8.31447 J/(mol.K)


In large open mines - like this one - its much more likely to be accurate though :-) And lets face it, the degree of accuracy may/or might not been deemed good enough depending on what you're doing.

Obviously all that is required normally is a dP i.e. the difference in absolute pressure measured at point x and point y within the mine, in order to give a height and providing there is no major changes in humidity or thermally induced pressure variations between these points then it should be pretty much bang on.
-
Tim Watts
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 week ago #3575

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
When I am underground I take it forgranted that I am underground.

That tends to be sufficient :huh:

Ian
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 week ago #3576

  • timwatts
  • timwatts's Avatar
  • OFFLINE
  • Posts: 4356
  • Thank you received: 393
Ahh, but what if you are alone, and you turn off your lamp and you are in utter utter darkness. Where are you then????? ;-)
-
Tim Watts
The administrator has disabled public write access.

Re: Spar Mine (Hendre) 9 years 1 week ago #3577

  • Ian
  • Ian's Avatar
  • OFFLINE
  • Posts: 5132
  • Thank you received: 841
TimWatts wrote:
Ahh, but what if you are alone, and you turn off your lamp and you are in utter utter darkness. Where are you then????? ;-)

In solitude :huh: :huh:
A door, once opened, may be stepped through in either direction
The administrator has disabled public write access.
Time to create page: 0.152 seconds
Powered by Kunena Forum
| + - | RTL - LTR
Joomla! is Free Software released under the GNU/GPL License.