I've just been looking at this article about Prediction of rotary drilling penetration rate in iron ore oxides using rock engineering system and thought some might be interested in it.
Prediction of the drilling penetration rate is one of the important parameters in mining operations. This parameter has a direct impact on the mine planning and cost of mining operations.
Mining used to be the main industry many years ago down here, Pete. There's disused tin mines all over Cornwall. And dangerous shafts now made safe and blocked up. I believe a few are still open in the Redruth area for visitors to experience what it must have been like. All part of the Cornish history now long gone.
Julian gave an exclamation and nudged George.
"See that? It's the black Bentley again. KMF 102!"
The results show that the percentage of magnetite has an influence on the seismic and geomechanical parameters. Among of these parameters, the uniaxial compressive strength, porosity and P and S wave velocities have a liner relation with the percentage of magnetite.
I'm hoping that the mighty John Pickup will put that into layman's terms for us.
I know he's on holiday, but John always knows that he is still on call, even in his luxury padded cell!!
" A kind heart always brings its own reward," said Mrs. Lee.
- The Christmas Tree Aeroplane - Society Member
In the 1970s tv series The Goodies, on one occasion, when Tim, Graeme and Bill were prospecting in Cornwall, they found a cream mine followed by a scone and jam mine.
Does anybody else remember this particular episode?
The article is a bit too technical for me, Pete, but large drilling machines are fascinating to watch. A few years ago I enjoyed a television programme about Crossrail (the new railway line being constructed in London, the central section of which is underground). It was amazing to see the massive tunnel-boring machines in action, particularly watching them assemble the tunnel walls (using curved pieces of reinforced concrete) while in the process of drilling. They may have been boring machines, but they were anything but boring in my opinion! There's a short clip here showing them at work:
My children and I have twice visited the ancient copper mines on the Great Orme in Llandudno. The Great Orme is an extremely Blytonesque place and I couldn't stop thinking of The Island of Adventure, especially when we got to hold a copper nugget.
"Heyho for a starry night and a heathery bed!" - Jack, The Secret Island.
"There is no bond like the bond of having read and liked the same books."
- E. Nesbit, The Wonderful Garden.
A very interesting topic, Pete. You're quite right, the percentage of magnetite has a significant effect, especially on the porosity.
You failed to mention the water table which led to a loss of equipment in Chalfont St Peter after a flash flood in 1967, sadly never to be recovered.
What a pity we can't analyse Jack's nugget.
Barnard wrote: ↑02 Sep 2021, 18:51
In the 1970s tv series The Goodies, on one occasion, when Tim, Graeme and Bill were prospecting in Cornwall, they found a cream mine followed by a scone and jam mine.
Does anybody else remember this particular episode?
The Bunfight at the OK Tearoom. Possibly the finest half-hour of comedy, ever, in the world. I think so anyway.
Anita Bensoussane wrote: ↑02 Sep 2021, 21:23
My children and I have twice visited the ancient copper mines on the Great Orme in Llandudno. The Great Orme is an extremely Blytonesque place and I couldn't stop thinking of The Island of Adventure, especially when we got to hold a copper nugget.
I've been there too - though I forgot to think about Enid Blyton when I was there. What surprised me was how safe they said it was. All they did was dig out the tunnels, no pit props or anything, but there were no rock falls. (The guide said that as an archeologist, they rather hoped there would be a body found under a rockfall. Not because they wish ill on any 3,000 year old miner, but because they have no idea who these people were or what they looked like or what they wore. They used to cremate their dead, no helpful burial mounds.)
John Pickup wrote: ↑02 Sep 2021, 21:51
A very interesting topic, Pete. You're quite right, the percentage of magnetite has a significant effect, especially on the porosity.
How right you are (as usual) John.
It was thrilling to learn too in the article that:
Some of effective parameters on rock drillability are investigated in the models as well as some of them have been modified. These models may be inferred from either one or more than one production sites, or from small experimental in laboratory. Themodels may not work in all situations and cannot be able to recognize and consider effective parameters on rock drillability.
On a more mundane note, can anyone remember what happened to Jack's Nougat, sorry Nugget!!??
" A kind heart always brings its own reward," said Mrs. Lee.
- The Christmas Tree Aeroplane - Society Member
Underground mining has also other undesired effects after its exploit - in the Ruhr area where coal was mined underground they have to invest hundreds of million Euros per year to keep water out of the mines to avoid a collaps of the system. Still parts of the area are collapsing causing severe damage of the buildings on the ground.
