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Mine Exploration Forum

Author Hendre Spar Mine
manbat666

Joined: 30/09/2018
Location: Cornwall

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Hendre Spar Mine
Posted: 15/11/2018 22:55:11
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Hi there all,

Does anyone have any info about the history of Hendre Spar Mine? Some plans would be good, as well as any info about the history, and also working methods.

Thanks!
IP: 86.165.126.120
NewStuff

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Joined: 26/07/2010
Location: NE Wales

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Hendre Spar Mine
Posted: 16/11/2018 06:32:05
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http://www.ucet.org.uk/index.php?option=com_kunena&view=topic&catid=21&id=941&Itemid=191

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IP: 88.97.32.83
Praada

Joined: 03/03/2017
Location: Tibshelf

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Hendre Spar Mine
Posted: 16/11/2018 09:29:55
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Was here for my 3rd visit at the weekend, only did the non SRT area's, leaving the firehose worm hole for another day. I don't know of any proper surveys available, have looked before and found a basic line overlay of the system, but it's a very simple mine to orientate anyway. Brilliant way to kick a good day off exploring mines, the ladders get the adrenaline pumping for the day!

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IP: 87.224.25.210
caver1

Joined: 28/02/2016

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Hendre Spar Mine
Posted: 16/11/2018 13:09:01
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Interesting link to UCET, only quibble is the mineral being taking was calcite ( = spar), not felspar,which is not present in this mine IP: 51.9.119.51
manbat666

Joined: 30/09/2018
Location: Cornwall

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Hendre Spar Mine
Posted: 17/11/2018 22:18:14
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Thanks everyone! IP: 86.165.126.120
Dirtdigger

Joined: 04/11/2018

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Hendre Spar Mine
Posted: 13/01/2019 05:43:33
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Out of interest , do you know what they used the calcite mineral for ?? Blink IP: 188.29.165.64
Morlock

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Joined: 31/07/2008

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Hendre Spar Mine
Posted: 13/01/2019 05:56:21
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It would appear it's quite useful.

"The properties of calcite make it one of the most widely used minerals. It is used as a construction material, abrasive, agricultural soil treatment, construction aggregate, pigment, pharmaceutical and more. It has more uses than almost any other mineral."

https://geology.com/minerals/calcite.shtml
IP: 86.150.59.228 Edited: 13/01/2019 06:00:19 by Morlock
Dirtdigger

Joined: 04/11/2018

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Hendre Spar Mine
Posted: 13/01/2019 06:02:35
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Oh that is interesting, thanks very much for the quick and very informative reply - I remember seeing a huge white chunk ( of calcite?) on a stone table in spar mine , we thought it was quartz or quartzite ( dont know the difference? ? Blush
IP: 188.29.165.64
Paul Marvin

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Joined: 29/10/2012
Location: Derbyshire

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Hendre Spar Mine
Posted: 13/01/2019 17:52:36
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Shall be doing a video soon all the stills and motion is done it just needs editing together .

I like this place nice and bright Big Grin

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Pete K

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Joined: 08/02/2009
Location: The Peak District or Snowdonia

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Hendre Spar Mine
Posted: 13/01/2019 20:22:59
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Dirtdigger wrote:

quartz or quartzite ( dont know the difference? ? Blush


Quartz is silicone dioxide. A milky white crystal not to be confused with the other (sometimes) milky white mineral - calcite. Crystal shape and glow under UV light can help distinguish them.

Quartzite is a metamorphic sandstone. You can see this at the Range on Anglesey and also as the sandy/cream coloured bands in parts of Cwmorthin.

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TheBogieman

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Joined: 12/02/2013
Location: Mold, NE Wales

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Hendre Spar Mine
Posted: 13/01/2019 21:42:02
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Calcite is crystalline calcium carbonate. There are many veins of spar in the limestone Halkyn Mountain range with many having been exploited. Because of its friable nature, it is easy to crush to whatever size you want. A classic use was for pebbledashing houses - gave a nice sparkly finish in sunlight...

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Les W

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Joined: 13/07/2010
Location: Wells, Somerset

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Hendre Spar Mine
Posted: 14/01/2019 16:29:12
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A further differentiation between quartz and calcite is hardness. On Moh's scale of hardness calcite is around 3 and quartz is 7, for comparison, fingernails are around 2.5 and steel is 5.5
A basic test is can you readilly scratch it with a knife blade? if so it's likely calcite.
Of course, if you happen to have some 10% HCl in your pocket... Cool

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tiger99

Joined: 07/03/2008
Location: Harrow Weald

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Hendre Spar Mine
Posted: 14/01/2019 18:21:13
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In addition to all the above, calcite is what limestone or chalk consist of, except that it is in crystalline form and probably much purer. The bulk materials are sedimentary deposits of tiny crystals, oriented at random, so you don't get the optical properties. Chalk is fairly pure sometimes, limestone is usually not.

For some reason it was needed during the Napoleonic War, and for that reason a seemingly totally uneconomic deposit was mined at Menstrie.

https://en.wikipedia.org/wiki/Menstrie#Industry_and_population

I would like to know why.

It is not commonly available in vast quantities and I expect that in many of the uses described above, e.g. as quoted by Morlock, limestone, readily available in bulk as we know, has been mis-described as calcite. Technically it is correct, limestone is largely calcite, but it conveys the wrong impression.
IP: 80.4.246.203
Dirtdigger

Joined: 04/11/2018

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Hendre Spar Mine
Posted: 18/01/2019 18:12:41
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Hi all , doe's anyone know what is down the worm hole with the fire hose ? How long a rope ect ? Blink cheers IP: 188.29.165.89
caver1

Joined: 28/02/2016

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Hendre Spar Mine
Posted: 18/01/2019 19:11:44
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4 fixed bolts, 27m rope, to a short stope with an incline heading to surface (blocked) and down to water (flooded). Likely to flood in a normal winter... IP: 51.9.119.51
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