Mine Sentence Examples
Mine will be taught to mind.
It was a gold mine, wasn't it?
So I say the horses and chickens are mine and Alex says the other animals are his.
You may bring mine with you.
Then I will take his soft chubby hand in mine, and go out in the bright sunshine with him.Advertisement
Mine is a very brutal world, he said.
Let him have mine, he has a long way to go!
It's your money, not mine.
You're mine either way.
You're no brother of mine, Darian.Advertisement
Which one is mine?
The mine sits on a few hundred acres old man Dawkins owned.
Whose goals are we talking about here, mine or yours?
Dean had no stomach for going any deeper than necessary and the water from the mine seepage was getting deeper.
Then I'll get mine fixed.Advertisement
You were mine the night I let you drink from me.
I held both her hands in mine.
I don't even know when mine is.
It sounds like the Lucky Pup Mine is at the bottom of the whole business.
As strong as I am, mine won't be enough.Advertisement
I see your thoughts like mine.
Here, have a sip of mine.
I thought I was marrying a man who had chosen a lifestyle compatible with mine.
I don't mind trying to make your day as good as you make mine.
Here the long, sunny days were mine, and all thoughts of work and college and the noisy city were thrust into the background.Advertisement
It is a rare privilege to watch the birth, growth, and first feeble struggles of a living mind; this privilege is mine; and moreover, it is given me to rouse and guide this bright intelligence.
It's Howie's head so it's his choice but the machines, are mine exclusively.
The honor is mine.
What was once mine is now ours.
Humphries is out of the system, according to a friend of mine.
Which one of you is mine?
Don't make no difference in a mine.
It was found in a mine.
But if he planted a bottle in Billy's vehicle after the accident, it's his word against mine the alcohol wasn't there at the time of the accident.
What's mine is yours.
You think the boy might not be mine?
No. There are homes in the area far less secure than mine.
I only see other people's fates, not mine.
The ones where you tell me you're mine.
David is going to find out who the guy in the mine is.
It could be a gold mine.
Joseph asked Fred for a marker and cardboard and began making "No Trespassing" signs, signifying he planned a visit to the mine later.
In 1895 the British Aluminium Company was founded to mine bauxite and manufacture alumina in Ireland, to prepare the necessary electrodes at Greenock, to reduce the aluminium by the aid of water-power at the Falls of Foyers, and to refine and work up the metal into marketable shapes at the old Milton factory of the Cowles Syndicate, remodelled to suit modern requirements.
Dean considered his poking options as he used half a cake of soap to scrub away the stink of the mine.
What's so valuable about the Lucky Pup Mine?
Twenty-four hours after his hour-long downhill hike from the mine, Dean's stilts felt like he'd run a barefoot marathon on cobblestoned streets.
After all, someone tried to get us lost in that mine and sabotaged our Jeep.
Cynthia Dean, in hoping for further confirmation that the bones had been switched, tried to contact the parents of Caleb Jones, Martha's friend who was with her in the mine.
Let's say the mine was closed up for years and only recently broken into.
He has a key to the mine gate.
The mine was sealed up for years.
Tomorrow, she's mine, Memon ordered, and rose.
In many instances, indeed, profits are more or less uncertain during the whole life of the mine, and it is evident that the value of the mining property must be more or less speculative.
The mine workings may also be flooded Flooding of by large bodies of underground water.
The right to mine for rubies by European methods and to levy royalties from persons working by native methods was leased to the Burma Ruby Mines Company, Limited, in 1889, and the lease was renewed in 1896 for 14 years at a rent of Rs.3,15,000 a year plus a share of the profits.
This waste, however, is decreasing, the coal abandoned in the mine having averaged, in the beginning of mining, two or three times the amount taken out; and the chief part of the remaining waste is in imperfect combustion in furnaces and fire-boxes.
Under the civil code of 1897 the earnings of a wife are her separate property, and it is provided that "no woman, nor any boy under age of twelve years, shall be employed to work or labour in or about any mine in this state."
Kant further insisted that this apperception, " I think," is an act of spontaneity, distinct from sense, necessary to regarding all my ideas as mine, and to combining them in a synthetic unity of apperception; which act Fichte afterwards developed into an active construction of all knowledge, requiring will directed to the end of duty.
But indirect experience includes all fact that is constructed from the basis of the ` this ' and the ` mine.'
To the same king is attributed the discovery of the inexhaustible salt mine called Chang-gitsa'wa (Byang-gi-tsa'wa =" northern salt "), which still supplies the greater portion of Tibet.
An exceptionally rich copper mine exists at Arghana Maden, but it is very imperfectly worked; galena mineral oil and silicious sand are also found.
It is a vast mine of experimental observation on the symptoms of poisoning of all kinds, on the appearances which poisons leave in the dead body, on their physiological action, and on the means of detecting them.
When, in the course of centuries, the exhaustion of richer ores shall have forced us to mine, crush and concentrate mechanically or by magnetism the ores which contain only 2 or 3% of iron, then the cost of iron in the ore, measured in terms of the energy needed to mine and concentrate it, will be comparable with the actual cost of the copper in the ore of the copper-mines of to-day.
I want a fwower on mine.
You really are mine.
I'd have been shocked if he didn't take his sweet time going up to the mine.
First off, I'm going to find out who owns that mine.
One of the ladies who worked at the courthouse made an offhand comment about the popular Lucky Pup Mine.
Mr. Dean here, part time detective and sheriff candidate, tracked down a hot lead on some bones—maybe a long dead villain—up at The Lucky Pup mine.
I own The Lucky Pup mine.
Let's hear your reasoning—then I'll tell you mine.
They were too busy distrusting one another and, for whatever reason, trying to con the other out of the mine.
He might not have known whose trail out of the tunnel he was sabotaging—just some trespasser in his precious mine.
Dawkins owns that mine!
Just like we were skirting the trespass law by poking around the mine.
The time frame was right for it to be the body of Senior Dawkins's mine manager, slain there in 1961.
It was the first real words the two had exchanged since their meeting at the mine.
Or whoever's ass ends up owning the mine, Dean thought, but he simply waved away the apology.
We had no business up at the mine.
If there were remains of a man in that mine, I would think you'd want to know who he was.
In the eyes of the Deans, it was looking more and more as if person or persons unknown did in fact take the original bones and switch them for the theatrical imitations Fitzgerald dragged out of The Lucky Pup mine.
At least Dean had refrained from disclosing the tie to the Dawkinses—Josh, the missing mine manager—nor had he mentioned he knew the name of the Dawkinses' stepmother.
It wouldn't be very smart to leave the body in your own mine property.
But he's far too young to have had any involvement with the Dawkinses, the mine, or the skeleton.
Someone had a campfire and it looked as if the door on the mine was used for fire wood.
Or, sweet Edith wasn't so sweet and bashed Josh's head in and left him in the mine.
A little girl—a sort-of ward of ours—had an interest in the Lucky Pup Mine.
I guess he had some bucks at one time—back when he bought all this land—but his bank account never held a candle to mine.
Did Paul ever talk about working a mine up there?
What are the odds of her meeting this guy and being the daughter of his mine manager from twenty years earlier and a thousand miles away?
Long pants or grubby clothes weren't necessary, as Dean had no intention of entering the mine.
More importantly, Dean now realized that the only real evidence that the remains from the mine were human had disappeared.
There's a woman whose husband owned the land where the mine is located and she may know something helpful, Dean told her.
They'd been in the mine for forty years.
They drove south from town and in less than a quarter mile, turned right onto what was locally known as the Camp Bird Mine Road.
After what seemed even longer than the Dean's first trip to the mine just two days earlier, they emerged into the basin where the valley floor was a sea of wildflowers.
Is someone in the mine, do you suppose?
Do you think it was he who shot at us up at the mine?
Most of 'em worked the Idarado Mine.
The tracks of the vehicle that preceded him were clear in the dust of the turnoff, and he knew he'd guessed correctly as he neared the now-familiar meadow below the mine.
His wife motioned toward the mine entrance out of sight in the rocks and trees.
He wanted us to go into the mine with him but when he saw you coming he went up alone.
You have a list of enemies longer than mine, and he's obligated to protect you.
If you can't do what I did in a week, he's mine.
The girl is mine.
And this is mine?
You must miss your home as I do mine.
Whoever you don't want is mine.
You're mine, like any of my possessions.
Mary & Joe Foreman were friends of mine.
It's a habit of mine, you know - watching after you.
Except that you're here to take something of mine.
Mine is just as old.
Other localities which have yielded the mineral in large amount are the Alibert mine in Irkutsk, Siberia and the Borrowdale mine in Cumberland.
Gold, silver and copper ores, have been found in the state, and attempts have been made to mine them, without much success.
Employers of workmen in a clay or coal mine, stone quarry, or on a steam or street railway are liable for damage in case of an injury to any of their workmen where such injury is caused by the negligence of the employer or of any servant or employee of the employer.
In October Lee attempted a third Bull Run campaign on the same lines as the second, but Meade's steadiness foiled him, and he retired to the Rapidan again, where he in turn repulsed Meade's attempt to surprise him (Mine Run, November 26-28, 1863).
On the 30th of July the Federal engineers exploded a mine under the hostile works, and Burnside's corps rushed to the assault.
In this part of the township a copper mine was worked between 1705 and 1745, and smelting and refining works were built in 1721.
In 1773 the mine was leased by the General Court and was fitted up as a public gaol and workhouse (called Newgate Prison), the prisoners being employed in mining.
Another old mine, discovered in 1853, is the New Idria located another 100 to.
An instance of transposition of words in part is in Shelley's "Invocation to Misery," 1.27, "And mine arm shall be thy pillow," where the 1st ed.
The United States mine nearly all of their iron ores, Austria-Hungary, Russia and France mine the greater part of theirs, but none of these countries exports much ore.
Belgium imports nearly all of its ore, while Sweden and Spain export most of the ore which they mine.
This work is a mine of varied exegetical and philological details.
The Levant mine is the chief, the workings extending beneath the sea.
But towards the close of 1870 stones were found at Jagersfontein and at Dutoitspan, far from the Vaal river, and led to a second great rush of prospectors, especially to Dutoitspan, and in 1871 to what is now the Kimberley mine in the neighbourhood of the latter.
It's private land, not national forest or park lands, and even though you or the Dawkinses own all this, it's not posted, except for the mine tunnel.
The mine was sealed, a new metal door and padlock in place where the gaping opening had welcomed the Deans two days before.
It was a mine portal, smaller than the main entrance to the Lucky Pup.
Not one of the threesome had a desire to enter the mine via this newfound entrance, but each cautiously examined the portal.
The portal was smaller and dryer than the main mine entrance and seemed to lead downward from this elevated location.
After they were settled in the vehicle and on their way back to town, Jennifer Radisson brought up the more mundane subjects of the mine and her litigation.
We based the age on when the ownership of the mine changed hands and when it was last worked.
The Lucky Pup has apparently been sealed up for the last forty years until someone—kids, we think—broke into the mine this spring.
He filled Fred in on meeting Jennifer Radisson, their afternoon trip to the mine, and the discovery of a back entrance.
And don't you dare go in that mine!
He gave only a glance up the path to the mine before returning to his Jeep.
He wiped his prints and replaced it, wondering if Joseph or Ginger Dawkins was responsible for the gunshot at the mine.
Besides, it's her word against mine.
That supports the suspicion that Billy and some of his friends were the ones who broke into the mine and first discovered the bones.
I suppose it's an offer on the mine.
A man named Dawkins bought the mine from the Rowland estate.
Then why would the heirs think the mine was so valuable to go to court over it?
The mine's like a thousand other holes in the ground—it's outlived its time.
I understand from Dawkins' son his old man was paying Josh pretty well to be his mine manager—up until August of 1961 when Josh disappeared.
Josh salted that mine and strung along the owner just enough to get a salary out of him.
Dawkins, Sr. had never hired another mine manager after Josh and never so much as mentioned the Lucky Pup after that time—to his sons or his wife.
Either one of them might have stolen the bony digit from Cynthia's jewelry case and fired a gun at the Lucky Pup Mine.
But the mine has a second entrance.
He rose to leave and then added, Whatever the age of that skeleton, the facts still remain that someone swapped the bones, someone stole the finger and 'metalman29' was offering an inflated price for the mine.
Then he added, You might have better luck learning who's been trying to buy the worthless mine and who at Bird Song swiped the itsy-bitsy bone you found.
They moved on to anyone involved with the mine property.
There's a chance the offer for the mine was completely innocent—simply someone who was legitimately interested in The Lucky Pup and then changed his mind.
Eyes widened when she learned someone had pilfered the small finger bone from Cynthia's bureau and she shivered when told the Deans had been followed into the mine.
She turned to the right, up the unpaved Camp Bird Mine Road.
It would end where it began—at the Lucky Pup Mine.
By that time, the mine was open anyway, so going in there wasn't breaking and entering.
Weren't you afraid Billy would know what he saw wasn't the fake bones Fitzgerald brought out of the mine?
We marked the way out of the mine but then he showed us he'd picked up our markings.
It was safer to leave him in the mine.
Why go back into the mine after all these years and take the chance of swapping the bones and getting caught?
Fred O'Connor seemed a tad put out that he'd been absent from the final confrontation in the Lucky Pup Mine until Dean reminded him that without his Internet connection and library research, Martha's bones would still be without identity.
When told of the happenings at her mine, she said she would consider changing its name—it hadn't been "lucky" for anyone.
No one hurts what's mine.
Mine are on the way.
I want to explore mine first!
His father may have betrayed mine, but he has been loyal for all these years we've been exiled.
I must protect them and ensure their honor and mine remains intact.
Mansr closed the door as another mine exploded and guided the spacecraft farther off the ground.
I thought they might be auburn, like mine.
You and Mrs. Dean are sort of like pals of mine, you know?
If she lives on in my sister's mind one way, and in mine another, what's the harm in that?
They say a blast at the Wanaka mine killed two.
She'll think the child is mine!
I don't know if she is aware of our arrangement as few words ever pass between us, but her quarters are far from mine and we will be ever so quiet in our love.
At least it looks like mine.
You see, when you die, you have your heaven and I have mine.
He said, "They are mine, they are personal and I will choose with whom to share them."
Emily would reprimand him, "No brother of mine will act like a savage."
Show me yours and I'll show you mine.
Ah, but you see, she is the one who stole mine.
Or you can merge it with mine, I don't care.
Maybe you should borrow mine.
It wouldn't physically be mine, but there's more to being a father than the time it takes to plant the seed.
I can't wait to make you mine - completely.
I've already warned him that you're still mine, and I have no intention of doing anything more than lending you to him.
No one threatens what's mine.
The decision was made at levels higher than mine that we are sending in everything we have in three days.
What your grandfather planned with mine so long ago is about to happen.
The underworld is mine.
Maybe. In any case, whatever you felt for Jade, you have to figure out how to get over it. You have your mate. I've been waiting for mine for a lifetime.
You buy assassinations from my death-dealers. Maybe your definition of evil is different than mine.
Mine is the most obvious choice.
Take mine, send everyone else back.
Take. Mine. Be done with this nonsense. Leave my mate and my hatchling alone!
You'll take mine, Death, if you take anyone's.
I had to pass Ivy and Lara's room to get to mine from the bathroom.
I never used powder or cover-up because there wasn't any for someone with skin as pale as mine.
Lastly, I examined a brown freckle of mine near my left ear.
I wish mine had as few scratches.
It's Norfolk's case—not Parkside's or mine.
I mean, if a fabulous body like mine can't get you going, maybe....
That was his idea, not mine.
I thought your children would be mine – or was it only me who wanted that so badly?
We're back to yours and mine again.
She can put a bed in one of the other bedrooms and I'll sleep in mine.
And the money is ours, not mine.
Why didn't you answer mine?
I left mine in the truck on the charger last night.
It was your decision to go, not mine.
This is where I prayed you'd be mine — when I was only sixteen.
I'll make it mine.
That's the way it feels ... like this baby is mine alone.
Mine made me what I am, Jenn.
My uncle - -his most trusted advisor - -is now mine, a man I trust but do not like.
Whatever you plan for him, plan for me before it's too late for your people or mine.
Tiyan is mine, Hilden.
Tiyan will be mine.
Tiyan wouldn't be mine without you.
The owners said there were wild plum and cherry trees, all kinds of nuts and berries - a regular gold mine of natural food.
Everything on mine is original - including the paint job.
I only wish to save mine.
This world can be mine.
Can you read mine?
Your problem to solve, not mine.
His mind control attempts against mine, and we had our own agendas.
I created an army of vamps Eden used to overthrow her enemies while I overthrew mine.
It marks you as mine.
Ashley's mine, Jonny said.
In Queensland there is one mine 3156 ft.
The first important mine, the Kapunda, was opened up in 1842.
It is estimated that at one time 2000 tons were produced annually, but the mine was closed ' in 1879.
In 1845 the celebrated Burra Burra mine was discovered.
This mine proved to be very rich, and paid £800,000 in dividends to the original owners.
For the period of thirty years during which the mine was worked the production of ore amounted to 234,648 tons, equal to 51,622 tons of copper, valued at £4,749,924.
The more important mines are those of Cobar, where the Great Cobar mine produces annually nearly 4000 tons of refined copper.
In New South Wales the principal centre of this industry is Hillgrove, near Armidale, where Other the Eleanora Mine, one of the richest in the state, is minerals.
The principal mine in New South Wales is situated at Kingsgate, in the New England district, where the mineral is generally associated with molybdenum and gold.
In 1826 the idea occurred to him of attacking this problem by means of pendulum experiments at the top and bottom of a deep mine.
His first attempt, made in the same year, at the Dolcoath mine in Cornwall, failed in consequence of an accident to one of the pendulums; a second attempt in 1828 was defeated by a flooding of the mine, and many years elapsed before another opportunity presented itself.
Important deposits of sulphur are worked at several localities in Japan, especially at the Kosaka mine in the province of Rikuchiu, and at Yatsukoda-yama, in the province of Mutsu.
This was followed by a reaction and a general collapse of inflated values until 1873, when the discovery of the Great Bonanza mine brought about a revival of industry and of speculation.
A second period of decline followed the working out of this mine and lasted until 1900, when the discovery of a new mineral belt in southern Nevada brought renewed prosperity.
On graduating in 1895 he worked for a time at a California mine to get experience.
Probably the earliest large find was a 17-lb nugget on the Reed Plantation in Cabarrus county in 1799; in the same mine a 28-lb nugget, probably the largest found in eastern United States, was discovered in 1803.
In 1902 the value of the gold and silver product combined was $71,287, and in 1908, when the Iola mine 6 m.
Here, as in the neighbouring Darab district, villages situated in the hills are called madan (mine), and some travellers have in their itineraries indicated a mine in localities where there is none.
One of these, the Morro Velho mine, belonging to an English company, is not only the deepest gold-mine in existence (over 2000 ft.), but it has been worked since 1725, and since 1835 by its present owners.
On this method the sacred writings are regarded as an inexhaustible mine of philosophical and dogmatic wisdom; in reality the exegete reads his own ideas into any passage he chooses.
South-eastern Sicily, ever since P. Orsi excavated the Sicel cemetery near Lentini in 1877, has proved a mine of early remains, among which appear in regular succession Aegean fabrics and motives of decoration from the period of the second stratum at Hissarlik.
In 1541 the richest mine was hopelessly flooded; in the insurrection of Bohemia against Ferdinand I.
The mines were abandoned at the end of the 18th century; one mine was again opened by the government in 1874, but the work was discontinued in 1903.
The hill is worked like a mine; pieces cut from it are carved by artists in Cardona into images, crucifixes and many articles of an ornamental kind.
The displeasure of the master sometimes dismissed his domestics to the more oppressive labours of the mill or the mine.
The planters and mine proprietors cried out against this as a national calamity.
Babingtonite is found as small black crystals on felspar in the granite of Baveno in Italy, and in the Haytor iron mine in Devonshire.
The " Cobre " mine is only the most famous and productive of various copper properties.
All these commodities are exported in considerable quantities, besides bitumen, which is obtained from a mine worked by a French III.
The original discoverer of a mine is entitled to a certain indemnity for " right of discovery " to be paid by the concessionaire of that mine, should the discoverer be unable to work it.
On the promulgation of the firman for the exploitation of a mine, a fee of £T50 to fTioo becomes payable.
The fixed rent is pp piastres per jerib (about 10,000 square metres), to he paid whether the mine is worked or not.
The proportional rents are fixed by the Mines Administration according to the wealth, area and facility of working of the mine, and are inserted in the imperial firman governing the mine, and must be paid before the minerals are exported.
The working of the mine must begin within two years of the date of the delivery of the mine to the concessionaire.
Should a mine-owner, in the course of developing his mine, damage the mine of a neighbouring owner, he must pay him an agreed indemnity.
No part of the subterranean working of a mine may be abandoned without official permission obtained according to formalities specified in the law.
Owners of the land in which a mine is located have a prior right to work such mine under imperial firman, on the obtention of which a duty of £T4 is payable; if they do not work it the concession may be granted to others, on payment of a certain compensation to the landowner.
The research of a mine in no way impairs the rights of ownership of the land in which the mine is located.
In the Inikurti mine, Nellore, "books" of mica measuring 10 ft.
Attempts to mine the copper followed, and the prospectors and hunters who penetrated northward sent to the Cape reports of the existence of a great river whose waters always flowed.
The Ypanema mine and ironworks, near Sorocaba, Sao Paulo, which belong to the national government, have been in operation since 1810, and small charcoal forges were in operation in colonial times and supplied the mines with a considerable part of the iron needed by them.
Bituminous coal of an inferior quality is mined to a limited extent in Rio Grande do Sul, and another mine has been opened in Santa Catharina.
He published first a collection of Dissertations sur l'histoire civile et ecclesiastique de Paris (3 vols., 1739-1743), then an Histoire de la ville et de tout le diocese de Paris (15 vols., 1745-1760), which is a mine of information, mostly taken from the original sources.
The Allies very properly insisted that the fleet must be surrendered into their hands, but before this could take place a deplorable incident occurred in Pola harbour, the " Viribus Unitis " being blown up by an Italian mine, with a Yugoslav admiral and crew on board.
The north-west chamber communicated with a large irregular chamber into which the plunderer's mine opened.
Near Pietersburg in the Zoutpansberg is the Eersteling, the first mine worked in the Transvaal.
The ground was discovered to be diamondiferous in 1897, but it was not until 1903, when mining began on the Premier mine, situated 20 m.
The site of the Premier mine had been recognized as diamond-bearing in March 1898.
On the 27th of January 1905, the largest diamond in the world, weighing 30254 carats, over 12 lb avoirdupois, was found in the mine and named the Cullinan.
In 1887 coal was found at Boksburg in the East Rand, and a mine was at once started.
In 1883 the discovery of Moodie's Reef near the Kaap Valley led to a considerable influx of diggers and prospectors from the colonies and Europe, and by 1884 the Sheba Mine had been opened up, and Barberton, with a population of 5000 inhabitants, sprung into existence.
When work restarted after the war, the mine owners offered the Kaffir workmen little more than half the wages paid in 1898; but this effort at economy was abandoned, and the old rates of pay were restored in January 1903.
The consequent small gold output meant a serious decrease of revenue, which was not compensated for by the heavy tax levied on the output of the Premier diamond mine, where operations began in 1903.
In England an outbreak at the Dolcoath mine, Cornwall, in 1902, led to an investigation for the home office by Dr Haldane F.R.S.
Thirty miles east by north of Pretoria is the Premier Diamond mine.
Finally, under the heads of administration, mine valuation, mining education, accidents, hygiene and mining law, will be discussed matters having important bearing on mining operations.
Conditions affecting the cost of opening, developing and working the mine or determining the methods to be adopted.
The mistake is often made of sinking large and expensive shafts, or driving costly tunnels, before it is fully proved that the deposit can be worked on a scale to warrant such developments, and, indeed, too often before it is known that the deposit can be worked at all; and in too many cases large amounts of money are thus unnecessarily lost by over-sanguine mine managers.
As soon as it appears reasonably certain that the property is workable the mine will be opened by one or more shafts, drifts or tunnels, and the underground passages for active mining operations will be started.
Either may be used for drainage of the mine workings, in which case it becomes an adit.
A mine should always be opened by drift or entry if practicable, as thereby the expense of hoisting and pumping is avoided.
When, however, the deposit lies below the surface the mine must be opened by a shaft.
As the mine is opened the deposit is subdivided into blocks of convenient size by parallel passages, which form later the main haulage roads, and by transverse openings for ventilation.
A mine, however, may be over-developed, which results in loss of interest on the capital unnecessarily locked up for years by excessive development, and involves additional cost for the maintenance of such openings until they are needed for active mining operations.
When the development of a mine has advanced sufficiently the operation of working or extracting the mineral begins.
The safety of the men must be one of the first considerations of the mine operator.
In most civilized countries the safety of mine workers is guarded by stringent laws and enforced by the careful supervision of mine inspectors on behalf of the government.
While it is always desirable to provide large working-places, the size of the working-place is limited by the thickness and Size of strength of the overlying beds forming the roof Working- or hanging wall of the mine.
A similar sacrifice in the shape of pillars is often necessary to support the surface, either to avoid injury to valuable structures or to prevent a flooding of the mine.
It is not desirable to leave large areas standing upon pillars in the mine, and as soon as the work on any level is completed the pillar below should be mined out as far as is safe, and the abandoned portion of the mine allowed to cave in and lessen the weight on the pillars elsewhere.
The cost of filling has been greatly reduced by the system of flushing culm, sand, gravel and similar material, through pipes leading from the surface into mine workings.
The excavated material is brought to the hoisting shaft, or sometimes directly to the surface, in small mine cars, moved by men or by animals, or by locomotives or wire-rope haulage.
The size, shape and design of the cars depend on the size of the mine passage and of the hoisting compartments of the shafts; on whether the cars are to be trammed by hand or hauled in trains; whether they are loaded by shovel or by gravity from a chute; and whether they are to be hoisted to the surface or used only for underground transport.
Mine cars are sometimes run long distances, singly or in trains, over roads which are given sufficient grade to impart considerable speed by gravity, say from I to 21%.
By using compressed air vitiation of the mine air is avoided, as well as all danger of fire or explosion of gas.
When the mine is worked through shafts, hoisting plant must be installed for raising the ore and handling men and supplies.
This is important in mine hoisting,.
A frame of wood or steel, erected at the shaft mouth, and rarely employed except for deep shafts of small cross-section or when the mine cars (tubs) are small, as in many parts of Europe.
To mine ore or coal at minimum cost it is necessary to work the mine plant at nearly or quite its full capacity and to avoid interruption and delays.
For short periods the mineral may remain in the mine cars, or may be loaded into railway wagons held at the mine for this purpose.
Cars, however, are too valuable to be used in this way for more than a few hours, and it is usual to erect large storage bins at the mine, at concentration works and metallurgical establishments, in which the mineral may be stored, permitting cars, wagons and vessels to be quickly emptied or loaded.
In driving mine passages thatj are to be used for drainage, care is taken to maintain sufficient gradient.
As the larger part of the water in a mine comes from the surface, the cost of drainage may be reduced by intercepting this surface water, and collecting it at convenient points in the pump shaft from which it may be raised at less cost than if permitted to go to the bottom.
Mine pumps of ordinary forms may be operated by compressed air, and air-lift pumps have been successfully employed.
Centrifugal pumps, constructed with several stages or sets of vanes, and suitable for high lifts, have been introduced for mine service.
When mine water is acid the working parts of the pump must be lined with or made of bronze or other non-corrosive material; or the acid may be neutralized by adding lime in the sump.
The air of a mine is vitiated by the presence of large numbers of men and animals and of numerous lights, each of which may consume as much air as a number of men.
The ventilation of a mine must in general be produced artificially.
In any case whether natural or artificial means be employed, a mine can only be ventilated properly when it has at least two distinct openings to the surface, one an intake or " downcast," the other a chimney serving as an " upcast."
If the two openings to the mine are at different levels the difference in weight of the inside and outside air due to difference in temperature causes a current, and in the winter months large volumes of air will be circulated through the mine from this cause alone.
In a mine with shafts opening at the same level, natural ventilation once established will be effective during cold weather, as the downcast will have the temperature of the outside air, while the upcast will be filled with the warm air of the mine.
In a mine with two shafts a ventilating current may result from other conditions creating a difference in the temperature of the air in either shaft - for example, the cooling effect of dropping water or the heating effect of steam pipes.
Ventilation may be produced by heating the air of the mine, as for example, by constructing a ventilating furnace at the bottom of an air shaft.
The efficiency of such ventilating furnaces is low, and they cannot safely be used in mines producing fire-damp. They are sometimes the cause of underground fires, and they are always a source of danger when by any chance the ventilating current becomes reversed, in which case the products of combustion, containing large quantities of carbon dioxide, will be drawn into the mine to the serious danger of the men.
The typical mine fan consists of a shaft upon which are mounted a number of vanes enclosed in a casing; the air entering a central side inlet is caught up by the revolving vanes and thrown out at the periphery by the centrifugal force thus generated.
The inlet opening of the pressure fan is in free communication with the outside air, the discharge connecting with the mine air-way; in the more generally used exhaust fan the inlet is connected with the airway, the fan discharging into the atmosphere.
Opposed to the motive force producing the air current is the frictional resistance developed in passing through the mine workings.
A certain pressure of air is required to maintain circulation against the resistance, and for a given volume per minute the smaller and more irregular the mine openings the greater must be the pressure.
The power required to circulate the air through a mine increases as the cube of the velocity of the air current.
To decrease the velocity, when large volumes of air are required, the air passages are made larger, and the mine is divided into sections and the air current subdivided into a corresponding number of independent circuits.
The circulation of air in any given division of the mine is further controlled and its course determined by temporary or permanent partitions, known as brattices, by the erection of stoppings, or by the insertion of doors in the mine passages and by the use of special airways.
So far as possible, vitiated air is led directly to the shaft instead of passing through other workings; for example, mine stables when used are placed near the upcast shaft and ventilated by an independent split of the ventilating current.
The deepest mine in the world is No.
Three other shafts of the Tamarack Company, and three of the neighbouring Calumet and Hecla mine, have depths of between 4000 and 5000 ft.
The Quincy mine, also in Houghton county, has reached a vertical depth of nearly 4000 ft.
This condition manifests itself, for example, in mine pillars which are subjected to a weight beyond the limit of elasticity of the mineral of which they are composed.
Similar swelling ground is not infrequently met with in metal mines, as, for example, in the Phoenix copper mine in Houghton county, Michigan, where the force developed was sufficient to crush the strongest timber that could be used.
In addition mining operations are subject to interruption and added expense from explosions, mine fires, flooding, and the caving-in of the workings.
In the case of a developed mine its life may be predicted in many cases with absolute certainty - as when the extent of the mineral deposit and the volume of mineral can be measured.
In other cases the life of the mine, like the value of the mineral, is more or less uncertain.