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Posts by derrickman

Showing 1334 results below:

Author Message
Topic: Cwmystwyth: Underground access
derrickman

Forum: Mid Wales   Posted: 03/11/2009 23:11:35   Subject: Cwmystwyth: Underground access
well, quite so.

I quite enjoy letting ttxela drag me along to Godstone or Masson occasionally, but there's rugby to be watched and occasionally played, banjos to play, grasstrack racing to
Topic: St Day, Geothermal Energy.
derrickman

Forum: South West England   Posted: 03/11/2009 22:54:05   Subject: St Day, Geothermal Energy.
the main thing I remember was his girlfriend calling him on the phone, she was trying to make the usual late-night, I-love-you-do-you-love-me sort of call, and he had a roomful of laughing, farting d
Topic: Cwmystwyth: Underground access
derrickman

Forum: Mid Wales   Posted: 03/11/2009 22:21:30   Subject: Cwmystwyth: Underground access
[quote="Wyn"]Derrickman wrote
[quote]the crux of the matter is, that this is an ambitious project involving a very large abandoned mine. It is very different from the narrow limestone workings at
Topic: Cwmystwyth: Underground access
derrickman

Forum: Mid Wales   Posted: 03/11/2009 21:26:43   Subject: Cwmystwyth: Underground access
I have no information about the water content at Cwmystwyth, but I would certainly agree with the comments about ochre, leachate from tips and water pH.

sounds as though the problem is know
Topic: Cwmystwyth: Underground access
derrickman

Forum: Mid Wales   Posted: 03/11/2009 19:47:08   Subject: Cwmystwyth: Underground access
I did say that I wouldn't take any further part in this thread, but under the circumstances..... that's not quite correct. There are a fair number of people on here with considerable professional expe
Topic: What caused the Iron Age?
derrickman

Forum: General Chat   Posted: 02/11/2009 23:46:16   Subject: What caused the Iron Age?
I would guess it was the availability of metal tools ( like bronze axes ) which made it possible to dig ore and cut timber for smelting?
Topic: Cwmorthin - Adits
derrickman

Forum: North Wales   Posted: 01/11/2009 20:37:28   Subject: Cwmorthin - Adits
depending on the exact composition of the broken waste, fines and blocks, it may form a localised concreted mass which shows considerable structural strength

timbers are usually difficult
Topic: Cwmorthin - Adits
derrickman

Forum: North Wales   Posted: 01/11/2009 18:18:53   Subject: Cwmorthin floor 2 collapse
depth of overburden is only part of the question, anyway.

Classic rock mechanics design relies on calculating the actual volume supported by a given structure, defined by ( among other thi
Topic: Cwmorthin - Adits
derrickman

Forum: North Wales   Posted: 01/11/2009 12:08:21   Subject: Cwmorthin floor 2 collapse
there is a set of Support Rules at Combe Down for doing exactly this. The early supports were timber, then various developments in the nature and concept of the project led to steel. Some timber props
Topic: Blaenau Ffestiniog regeneration
derrickman

Forum: North Wales   Posted: 01/11/2009 07:08:36   Subject: Blaenau Ffestiniog regeneration
depends.. is the purpose to actually 'regenerate', in the sense of providing something new, or simply to prop up some parts of a basically under-performing local structure for a while?
Topic: Cwmorthin - Adits
derrickman

Forum: North Wales   Posted: 01/11/2009 07:05:55   Subject: Cwmorthin floor 2 collapse
I would reckon 5 years in a wet environment was quite a good life for untreated timber props.

The ones at Combe Down are around that age, or less in some cases, and they are visibly life-e
Topic: St Day, Geothermal Energy.
derrickman

Forum: South West England   Posted: 31/10/2009 22:43:56   Subject: St Day, Geothermal Energy.
Kenting Drilling, ah yes, the first step to my screen name... it's sometimes said that I'm a cynical soul, usually by people who know me quite well, but I would have to feel that if there was anything
Topic: Forgotten heroes
derrickman

Forum: South West England   Posted: 31/10/2009 07:47:49   Subject: Forgotten heroes
[mod]Sections of deleted quoted message removed[/mod]

ICLOK has covered the real point - over-romanticisation of a hard trade by people with little or no first-hand experience of it - very
Topic: Forgotten heroes
derrickman

Forum: South West England   Posted: 30/10/2009 22:11:59   Subject: Forgotten heroes
[mod]This message has been deleted because of a complaint that it quoted from (and displayed) a private message. Private messages are private, and are not to be quoted publically without permission of
Topic: LTD vs LLP
derrickman

Forum: South West England   Posted: 30/10/2009 12:37:23   Subject: LTD vs LLP
I can't comment on the operation of the motor trade, but I have always felt there was a definite value in keeping my business and personal affairs separate.

I have once been able to walk aw
Topic: Blaenau Ffestiniog regeneration
derrickman

Forum: North Wales   Posted: 30/10/2009 11:13:40   Subject: Blaenau Ffestiniog regeneration
well, quite.

It might be just me, and I don't know Ffestiniog, but I would rather guess that if you spread £4.5m among local businesses in the form of orders, or grants for new machinery,
Topic: Blaenau Ffestiniog regeneration
derrickman

Forum: North Wales   Posted: 30/10/2009 10:41:07   Subject: Blaenau Ffestiniog regeneration
because they are politically-appointed placemen who only have so much money, and no real ideas......
Topic: LTD vs LLP
derrickman

Forum: South West England   Posted: 30/10/2009 07:49:10   Subject: LTD vs LLP
well, yes... I sometimes think they generate more jobs for themselves than anyone they actually help, but there's a lot of specialist advice available free, and there are some valuable benefits in ter
Topic: LTD vs LLP
derrickman

Forum: South West England   Posted: 29/10/2009 23:01:40   Subject: LTD vs LLP
you really need to get specialist advice at this point. See an accountant specialising in this field. He will need to see your business plan.
Topic: LTD vs LLP
derrickman

Forum: South West England   Posted: 29/10/2009 22:02:33   Subject: LTD vs LLP
I didn't mention the Co limited by guarantee, because (a) I have no experience of it , and (b) I had inferred from posts elsewhere, that the question was probably about a small mining venture.
Topic: Camera insurance
derrickman

Forum: General Chat   Posted: 29/10/2009 16:05:34   Subject: Camera insurance
http://www.portreathslsc.co.uk/43_3113.php

try these folks, seems they have a surf webcam, so they might have what you are looking for
Topic: Camera insurance
derrickman

Forum: General Chat   Posted: 29/10/2009 09:30:59   Subject: Camera insurance
Peli cases are great, but he tend to be both expensive and bulky, so it's a matter of taking a view on the value of what you intend to take down.

I do a fair amount of record photography at
Topic: Harriet shaft Dolcoath
derrickman

Forum: South West England   Posted: 28/10/2009 21:24:45   Subject: Harriet shaft Dolcoath
ok got it.

must admit I hadn't looked at the new website closely
Topic: Harriet shaft Dolcoath
derrickman

Forum: South West England   Posted: 28/10/2009 19:35:10   Subject: Harriet shaft Dolcoath
Trafigura Beheer? ok that makes all kinds of sense, [i]their[/i] level of cashflow, and profit, means South Crofty are just a second-tier tax loss.

see what you miss, getting information se
Topic: Harriet shaft Dolcoath
derrickman

Forum: South West England   Posted: 28/10/2009 18:40:20   Subject: Harriet shaft Dolcoath
I would say that the commercial aspects of WUM ( the South Crofty one, that is ) are very much the heart of the matter.

the question is, who is the financial backer?

An unlisted
Topic: LTD vs LLP
derrickman

Forum: South West England   Posted: 28/10/2009 15:31:28   Subject: LTD vs LLP
the two alternatives are different , depending on the nature of the business. The legal status of a Partner and a Director are somewhat different.

the crucial difference is that a PLC ( as
Topic: Harriet shaft Dolcoath
derrickman

Forum: South West England   Posted: 28/10/2009 14:50:58   Subject: Harriet shaft Dolcoath
[quote="Cornish Pixie"]Wrong again Derrickman. I am not a Cornishman, but a Cornishwoman, and my avatar is not a pixie, but a medieval miner that appears on a sign in Kutna Hora, Czech Republic.
Topic: Harriet shaft Dolcoath
derrickman

Forum: South West England   Posted: 28/10/2009 14:48:37   Subject: Harriet shaft Dolcoath
this overlaps with the recent posting by minegeo regarding production in the latter days of the previous Crofty, lode structures in the area and deep drilling techniques.

very interesting t
Topic: Harriet shaft Dolcoath
derrickman

Forum: South West England   Posted: 28/10/2009 13:07:35   Subject: Harriet shaft Dolcoath
It's a matter of perspective. You could go back to the thread about the BBC's 'tin men' programme, and find a different one.


I don't doubt that someone who proclaims himself to be a
Topic: Harriet shaft Dolcoath
derrickman

Forum: South West England   Posted: 28/10/2009 10:45:02   Subject: Harriet shaft Dolcoath
see post above... I've long since felt that the old Crofty management knew much more about Dolcoath than they were prepared to let on.

I worked at Foraky in the early 80s, there were at tha
Topic: Harriet shaft Dolcoath
derrickman

Forum: South West England   Posted: 28/10/2009 08:58:37   Subject: Harriet shaft Dolcoath
commercial mining companies almost never 'explore' old workings. To know they are there, and give them a wide berth - 'wide' as defined by the various legislation plus any design detail that can be ex
Topic: A Fabulous piece of casting at Penrhyn
derrickman

Forum: North Wales   Posted: 27/10/2009 20:55:03   Subject: A Fabulous piece of casting at Penrhyn
ground freezing has always been something of a last resort.

the Selby coalfields, Boulby shafts and Sherburn-in-Elmet drift were design solutions for the specific purpose of penetrating the
Topic: A Fabulous piece of casting at Penrhyn
derrickman

Forum: North Wales   Posted: 27/10/2009 19:23:22   Subject: A Fabulous piece of casting at Penrhyn
depends on the job.

disregarding special cases like wedgeblock shields which have no tailskin, or articulated and TBM shields which are a different kettle of fish, a generic Greathead hand-
Topic: A Fabulous piece of casting at Penrhyn
derrickman

Forum: North Wales   Posted: 27/10/2009 18:42:49   Subject: A Fabulous piece of casting at Penrhyn
[quote="Morlock"]Interesting, I assume the shield was normal circular and a bit larger than the lining?[/quote]

it would have been a conventional Greathead shield, like this http://www.subb
Topic: A Fabulous piece of casting at Penrhyn
derrickman

Forum: North Wales   Posted: 27/10/2009 17:09:08   Subject: A Fabulous piece of casting at Penrhyn
[quote="Morlock"][quote="derrickman"]
the only way I can see this was done, would be for the main moulds to have been substantially made, then fitted exactly after the junction, modified as requi
Topic: A Fabulous piece of casting at Penrhyn
derrickman

Forum: North Wales   Posted: 27/10/2009 16:12:55   Subject: A Fabulous piece of casting at Penrhyn
I did a job in the early 80s, a tunnel connection in the Warrington area ( part of the Vyrnwy aqueduct upgrading, as it happens )

the reception shaft consisted of a wrought-iron shaft sunk
Topic: Graffiti removal / digital manipulation of images?
derrickman

Forum: Underground Photography & Video   Posted: 27/10/2009 14:33:28   Subject: Graffiti removal / digital manipulation of images?
graffiti can be history.

I was at El Djem in Tunisia last year. The amphitheatre there is heavily marked with graffiti, from which you can see that it has been a target for essentially simi
Topic: Harriet shaft Dolcoath
derrickman

Forum: South West England   Posted: 27/10/2009 14:24:13   Subject: Harriet shaft Dolcoath
batting this about in the pub the other evening, consensus among several people here on the Combe Down site who worked at Crofty at various times, is that there is no worthwhile access to any part of
Topic: South Crofty - Owners expect 80 years of mining.
derrickman

Forum: South West England   Posted: 27/10/2009 14:14:57   Subject: South Crofty - Owners expect 80 years of mining.
this is where we come back to the much-aired topic on here, about various people taking professional vs amateur viewpoints.

Mark Twains' proverbial "hole in the ground, owned by a liar" ref
Topic: Bwlch y Plwm? - or somewhere else?
derrickman

Forum: North Wales   Posted: 23/10/2009 12:06:28   Subject: Bwlch y Plwm? - or somewhere else?
love the cars......
Topic: Bad air detection
derrickman

Forum: General Chat   Posted: 21/10/2009 15:51:53   Subject: Bad air detection
I'd be curious to know when they were last manufactured.

J Murphy and Sons certainly had a large stock of them when I was working for them in the late 80s, they were usually used in conjun
Topic: Archaeology project on Alston moor
derrickman

Forum: North West England   Posted: 21/10/2009 12:46:04   Subject: Archaeology project on Alston moor
I think the only reason it has provoked such a reaction, is that there are plenty of people on this forum who are well aware that the subject has been well covered not so long ago, by others.
Topic: Bad air detection
derrickman

Forum: General Chat   Posted: 21/10/2009 12:40:49   Subject: Bad air detection
the QRAE one is very good. I didn't mention it because last time I bought them, they were £400-plus.

def agree about not using single-gas ones
Topic: Bad air detection
derrickman

Forum: General Chat   Posted: 21/10/2009 11:24:54   Subject: Bad air detection
[quote="rikj"][quote="tomh"]As im in Cornwall i understand oxygen deficiency is the main one to look out for. I looked at some of the products mentioned and they are probably overkill for what i need.
Topic: Bad air detection
derrickman

Forum: General Chat   Posted: 21/10/2009 10:02:45   Subject: Bad air detection
something like the Crowcon Gasman

this will still cost you about £290, require calibration and can be ruined in a moment by getting it wet.

the simplest and cheapest one is the f
Topic: Bad air detection
derrickman

Forum: General Chat   Posted: 21/10/2009 08:56:24   Subject: Bad air detection
I deliberately didn't mention the Crowcon 'gasman' for that reason - it's a one-gas unit which is widely used in refineries and chemical plants in particular.

Then again, all electronic uni
Topic: Archaeology project on Alston moor
derrickman

Forum: North West England   Posted: 21/10/2009 08:46:48   Subject: Archaeology project on Alston moor
I don't have any experience to speak of, of KAP. The impression I have of it, is as a method of doing a certain amount very cheaply, but that may just be because I haven't seen enough of it to know ot
Topic: Bad air detection
derrickman

Forum: General Chat   Posted: 20/10/2009 20:40:33   Subject: Bad air detection
atmospheric monitoring is compulsory under MASHAM regs.

ironstone mines suffer from oxygen depletion due to ores oxidising, so do sulphide ore-bodies ( eg Wheal Jane, where a fatal suffocat
Topic: Bad air detection
derrickman

Forum: General Chat   Posted: 20/10/2009 20:12:26   Subject: Bad air detection
good question.

I use a gas detector, but I have one on my desk, and can borrow it whenever I want, which most people don't. The Crowcon Triple plus is a very common one http://www.crowcon.c
Topic: Archaeology project on Alston moor
derrickman

Forum: North West England   Posted: 20/10/2009 15:51:42   Subject: Archaeology project on Alston moor
but that isn't why he is on the box, is it? He is being a straight man for someone whose main claim to historic scholarship is being on Black Adder, after all :lol:

Same goes for his rotu
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