Analysis of A Lesson Before Dying Essay -- Ernest J. Gaines

Grant Wiggins is the narrator of the novel. He was born in the plantation just outside of Bayonne, Louisiana. He lived there until he went away to college, and when he went back home, he was detached from the people in the town because of his education and different religious beliefs. He is easily angered and often very selfish. This is seen in the way that he acts towards Vivian. He consistently does not give her the attention or respect that she deserves. He refers to her children as simply, â€Å"the babies,† and only cares about the names of his and Vivian’s future children. Grant goes from shallow and selfish at the beginning of the story, to caring and loving at the end. Jefferson is an honest, young black man with below-average intelligence. After being called a hog by his lawyer, he loses all self-respect, and feels as if he is really no better than a hog. He becomes sullen and angry after being sentenced to death. The visits that Grant pays Jefferson eventually revive him out of his emotional slumber, and he begins to see himself as a human being again. Ultimately, he serves as Grants teacher, as he shows him how to be loyal and how to love. Tante Lou is Grant’s extremely religious and aunt. She is very persistent, and does not stop begging Henri Pichot until he agrees to talk to the sheriff about her and Grant visiting Jefferson. Tante Lou’s faith allows her to believe that Jefferson will die as a man. Without this faith, Grant, at first, does not believe in Jefferson. Despite her social status because of her skin, she and Miss Emma dress with dignity, and demand respect from all who will give it to them. Minor Characters Miss Emma is Jefferson’s godmother. She loves her godson Jefferson, and shows this through all of... ...ed by Grant on his drive to Bayonne. â€Å"I want you to show them the difference between what they think you are and what you can be.† This is a quote from Grant to Jefferson. Grant tries to instill on Jefferson the significance of his death. He wanted Jefferson to be an example of the strength of black people as a whole. â€Å"To show too much intelligence would have been an insult to them. To show a lack of intelligence would have been a greater insult to me.† This is a quotation of Grant’s thoughts. He was talking to the sheriff, and did not know how to act. He is more educated than the sheriff, but since he is black, he cannot show it. â€Å"Manners if for the living.† This quote is from Jefferson to Grant. Jefferson said this to Grant after insulting Vivian. It shows his lack of love for life. At this point of the story, he was sad and lonely and did not want to live.

Use of Conventions in Literary Works Such as Shakespeares Hamlet :: Props Hamlet Tragic Tragedy Analysis

Conventions are commonly known as a customary feature of a literary work such as the use of a chorus in Greek tragedy or an explicit moral in a fable. They are found in stories, plays, essays, poetry, and movies. Conventions are found frequently in Shakespeare’s Hamlet, Taming of the Shrew, and Othello. They are also detected in D. H. Lawrence’s The Horse Dealer’s Daughter and The Rocking Horse Winner, and lastly in Henrik Ibsen’s A Doll House. These literary devices all grasp the same conventional concept. The use of a prop in a literary work is a perfect example of a convention—each prop is used to show a significant idea in its respective literary work. William Shakespeare was an English playwright and poet. He was recognized in much of the world as the greatest of all dramatists. In Hamlet, Shakespeare provides the first prop as letters. Ophelia proclaims, â€Å"My lord, I have remembrances of yours, That I have longed long to redeliver; I pray you, now receive them† (III.I.93-95). In this citation, Ophelia gives Hamlet the letters (â€Å"them†) of poetry he has written to her. With this action, she manages to devalue Hamlet, bring forth a feeling of worthlessness and unimportance. Another significant prop in Hamlet is the fencing sword. Fencing was a common, competitive and recreational sport practiced in the Middle Ages. The sword was usually tipped with foil to prevent injury. In act V, Hamlet and Leartes engage in a game of fencing. Leartes deceives Hamlet and â€Å"unbates† his sword. The unbated sword is soaked in poison and the opponents bleed on both sides (V.II.271-273). This occurrence signifies the revenge each son is instilled with. Hamlet is mislead by his long-lived acquaintance. Deception and revenge brought him to his final resting place Also in act V, Hamlet and Horatio watch two clowns while they dig a grave. While the clowns dig, they come across a skull. Hamlet pronounces, â€Å"This might be the pate of a politician, which this ass now o’er reaches; one that would circumvent God, might it not?† (V.I.66-67). This skull resembled Hamlet’s jester who has passed away over 20 years ago. The skull represented the dead smell in Denmark. This is a turning point in the drama. Everything around Hamlet was falling; first his father, the incest of marriage, and his fair Ophelia. The props so far have lead up to the dramatic end of the play.

Essay --

Through the ages of United States, school dropout rate has been startling. Although. Historically, high school dropout rates have been steadily declining over past decades. 11.2% high school students dropout in 1994 which is 5.8% less in comparison to 17% dropout in 1970 (Debra Marguerite). Nevertheless, according to data in 2009, one- third of high school students nationwide do not successfully achieve a high school diploma and 1.2 million youths drop out each year-which translates into on dropout every 26 seconds (Enelida, 2010). Dropouts come disproportionately from low-income and minority families. Based on previous study, students from low-income families are substantial likely to leave school prematurely than their peers who is from higher-income family. In some communities, Africa American and Latino made up to 50% of the total dropout number. In fact, in 1970, 17% dropout rate did not constitute a social problem. It was relatively easier for those who dropout to seek adequate paid employment. In today’s social context, the consequences of leaving school without a diploma are more costly (Marguerite). Due to technology advancement, traditional goods-producing economy has transformed to a more service orientated economy. As the result, labor market for blue collar occupations has been shrinking in recent years. Based on Census 2000 data, a suburb of southeast Los Angeles County, California, where dropout rate was nearly 50%, 28% of its inhabitants are impoverished, which is twice the state average of 14%. Even before the financial crisis, nearly half of dropouts were unable to seek paid employment during an entire year. In additional to financial difficulties, high school dropouts are trend to become involved with justice ... ...t dropouts used to describe school life. The school was located in major drug-traffic area of a low income community which is literally one step away for those youth to go on street, engage gang activity and use drug. None of the teachers at Rosa Parks School were a part of the community in which they taught (Ferguson). The sad, shock stories school adults told were based on prejudiced judgment associated with children’s behavior at school, children’s failure as largely the consequence of their attitudes and behaviors as well as those of their families (Ferguson). Families of at-risk children are asserted as lack parental skills; they do not give their children the kind of support that would build â€Å"self-esteem† necessary for school achievement (Ferguson). Faculty should communicate and spend quality time with parents; it helps both sides to understand.

Literature of Knowledge Essay

First printed in The North Briton Review, August, 1848, as part of a review of The Works of Alexander Pope, ed. W. Roscoe, 1847. What is it that we mean by literature? Popularly, and amongst the thoughtless, it is held to include everything that is printed in a book. Little logic is required to disturb that definition. The most thoughtless person is easily made aware that in the idea of literature one essential element is, ? some relation to a general and common interest of man, so that what applies only to a local or professional or merely personal interest, even though presenting itself in the shape of a book, will not belong to literature. So far the definition is easily narrowed; and it is as easily expanded. For not only is much that takes a station in books not literature, but, inversely, much that really is literature never reaches a station in books. The weekly sermons of Christendom, that vast pulpit literature which acts so extensively upon the popular mind? to warn, to uphold, to renew, to comfort, to alarm? does not attain the sanctuary of libraries In the ten-thousandth part of its extent. The drama as for instance the finest of Shakespeare’s plays in England and all leading Athenian plays in the noontide of the Attic stage, operated as a literature on the public mind, and were (according to the strictest letter of that term) published through the audiences that witnessed their representation, some time before they were published as things to be read: and they were published in this scenical mode of publication with much more effect than they could have had as books during ages of costly copying or of costly printing. Books, therefore, do not suggest an idea co-extensive and interchangeable with the idea of literature, since much literature, scenic, forensic, or didactic (as from lectures and public orators), may never come into books, and much that does come into books may connect itself with no literary interest. But a far more important correction, applicable to the common vague idea of literature, is to be sought, not so much in a better definition of literature, as in a sharper distinction of the two functions which it fulfils. In that great social organ which, collectively, we call  literature, there may be distinguished two separate offices, that may blend and often do so, but capable, severally, of a severe insulation, and naturally fitted for reciprocal repulsion. There is, first, the literature of knowledge, and secondly, the literature of power. The function of the first is to teach; the function of the second is to move: the first is a rudder; the second an oar or a sail. The first speaks to the mere discursive understanding; the second speaks ultimately, it may happen, to the higher understanding, or reason, but always through affections of pleasure and sympathy. Remotely it may travel towards an object seated in what Lord Bacon calls dry light; but proximately it does and must operate? else it ceases to be a literature of power-on and through that humid light which clothes itself in the mists and glittering iris of human passions, desires, and genial emotions. Men have so little reflected on the higher functions of literature as to find it a paradox if one should describe it as a mean or subordinate purpose of books to give information. But this is a paradox only in the sense which makes it honorable to be paradoxical. Whenever we talk in ordinary language of seeking information or gaining knowledge, we understand the words as connected with something of absolute novelty. But it is the grandeur of all truth which can occupy a very high place in human interests that it is never absolutely novel to the meanest of minds: it exists eternally, by way of germ or latent principle, in the lowest as in the highest, needing to be developed but never to be planted. To be capable of transplantation is the immediate criterion of a truth that ranges on a lower scale. Besides which, there is a rarer thing than truth, namely, power, or deep sympathy with truth. What is the effect, for instance, upon society, of children? By the pity, by the tenderness, and by the peculiar modes of admiration, which connect themselves with the helplessness, with the innocence, and with the simplicity of children, not only are the primal affections strengthened and continually renewed, but the qualities which are dearest in the sight of heaven-the frailty, for instance, which appeals to forbearance, the innocence which symbolizes the heavenly, and the simplicity which is most alien from the worldly-are kept up in perpetual remembrance, and their ideals are continually refreshed. A purpose of the same nature is answered by the higher literature, viz. , the literature of power. What do you learn from Paradise Lost? Nothing at all. What do you learn from a cookery-book? Something new, something that you did not know before, in every paragraph. But would you therefore put the wretched cookery-book on a higher level of estimation than the divine poem? What you owe to Milton is not any knowledge, of which a million separate items are still but a million of advancing steps on the same earthly level; what you owe is power, that is, exercise and expansion to your own latent capacity of sympathy with the infinite, where every pulse and each separate influx is a step upwards, a step ascending as upon a Jacob’s ladders from earth to mysterious altitudes above the earth. All the steps of knowledge, from first to last, carry you further on the same plane, but could never raise you one foot above your ancient level of earth; whereas the very first step in power is a flight, is an ascending movement into another element where earth is forgotten. Were it not that human sensibilities are ventilated and continually called out into exercise by the great phenomena of infancy, or of real life as it moves through chance and change, or of literature as it recombines these elements in the mimicries of poetry, romance, etc., it is certain that, like any animal power or muscular energy falling into disuse, all such sensibilities would gradually droop and dwindle. It is in relation to these great moral capacities of man that the literature of power, as contradistinguished from that of knowledge, lives and has its field of action. It is concerned with what is highest in man; for the Scriptures themselves never condescended to deal by suggestion or cooperation with the mere discursive understanding: when speaking of man in his intellectual capacity, the Scriptures speak not of the understanding, but of â€Å"the understanding heart, â€Å"?  making the heart, i. e. , the great intuitive (or non-discursive) organ, to be the interchangeable formula for man in his highest state of capacity for the infinite. Tragedy, romance, fairy tale, or epopee, all alike restore to man’s mind the ideals of justice, of hope, of truth, of mercy, of retribution, which else (left to the support of daily life in its realities) would languish for want of sufficient illustration. What is meant, for instance, by poetic justice? ?It does not mean a justice that differs by its object from the ordinary justice of human jurisprudence; for then it must be confessedly a very bad kind of justice; but it means a justice that differs, from common forensic justice by the degree in which it attains its object, a justice that is more omnipotent over its own ends, as dealing? not with the refractory elements of earthly life, but with the elements of its own creation, and with materials flexible to its own purest preconceptions. It is certain that, were it not for the Literature of Power, these ideals would often remain amongst us as mere arid notional forms; whereas, by the creative forces of man put forth in literature, they gain a vernal life of restoration, and germinate into vital activities. The commonest novel, by moving in alliance with human fears and hopes, with human instincts of wrong and right, sustains and quickens those affections. Calling them into action, it rescues them. from torpor. And hence the preeminency, over all authors that merely teach of the meanest that moves, or that teaches, if at all, indirectly by moving. The very highest work that has ever existed in the literature of Knowledge is but a provisional work: a book upon trial and sufferance, and quamdiu bene se gesserit. Let its teaching be even partially revised, let it be but expanded, ? nay, even let its teaching be but placed in a better order, ? and instantly it is superseded. Whereas the feeblest works in the Literature of Power, surviving at all, survive as finished and unalterable amongst men. For instance, the Principia of Sir Isaac Newton was a book militant on earth from the first. In all stages of its progress it would have to fight for its existence: 1st as regards absolute truth; idly, when that combat was over, as regards its form or mode of presenting the truth. And as soon as a La Place, or anybody else, builds higher upon the foundations laid by this book, effectually he throws it out of the sunshine into decay and darkness; by weapons won from this book he superannuates and destroys this book, so that soon the name of Newton remains as a mere nominis umbra,† but his book, as a living power, has transmigrated into other forms. Now, on the contrary, the iliad, the Prometheus of Aeschylus, the Othello or King Lear, the Hamlet or Macbeth, and the Paradise Lost are not militant but triumphant forever as long as the languages exist in which they speak or can be taught to speak. They never can transmigrate into new incarnations. To reproduce these in new forms, or variations, even if in some things they should be improved, would be to plagiarize. A good steam engine is properly superseded by a better. But one lovely pastoral valley is not superseded by another, nor a statue of Praxiteles by a statue of Michael Angelo. These things are separated not by  imparity, but by disparity. They are not thought of as unequal under the same standard, but as different in kind, and, if otherwise equal, as equal under a different standard. Human works of immortal beauty and works of nature in one respect stand on the same footing: they never absolutely repeat each other, never approach so near as not to differ; and they differ not as better and worse, or simply by more and less: they differ by undecipherable and incommunicable differences, that cannot be caught by mimicries, that cannot be reflected in the mirror of copies, that cannot become ponderable in the scales of vulgar comparison.

Greenhouse Gases

We know electricity is a form of energy and energy is the ability to perform work or make things happen, we also know there are several sources of energy and â€Å"wind† happens to be one of those sources. Since â€Å"wind† is simply air in motion, what then is â€Å"wind energy† and how can we generate electricity from it? Well, based on my research, wind energy is the result of the sun’s energy interacting with the earth’s surfaces. It is also an ideal renewable energy source that is infinitely sustainable; pollution free; doesn’t use fuel; and doesn’t produce greenhouse gases, toxic or radioactive waste.This type of energy is considered a green power technology because it has minor impacts on the environment. When using wind to generate electricity we use machines known as turbines and this turbines use blades that are connected to a drive shaft to collect the winds’ kinetic energy which creates a lift that causes them to tur n and then produces electricity using an electric generator. Okay now we know basics, how does this energy source reduce greenhouse gases? First of all, what are these â€Å"greenhouse gases†?Greenhouse gases are gases in an atmosphere that absorb and emit radiation within the thermal infrared range . The primary greenhouse gases in the Earth's atmosphere are water vapor, carbon dioxide (the principal greenhouse gas), methane, nitrous oxide, and ozone. From definition, we know that generating electricity for wind does not produce any of these GHG. Before analyzing how efficient wind energy is in reducing GHG, let us consider some other sources of energy. These other sources include: hydropower (water), solar (sun), geothermal (heat) and nuclear.

Sub Level Caving

Sublevel caving techniqueSimplicity and low cost are the essence SUBLEVEL CAVING TECHNIQUE SIMPLICITY AND LOW COST ARE THE ESSENCE Author: Partha Das Sharma, B. Tech(Hons. ) in Mining Engineering, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/ 1. Introduction – Sublevel caving is usually carried out when mining of the orebody through an open pit method is no longer economically feasible. Mining now proceeds underground, underneath the open pit. At first, both a raise and a network of tunnels are made.At different sublevels, jumbos are used for long hole drilling, drilling directly upwards into the roof. These holes are then charged with explosives and blasted. As the roofs cave in, the rock from the ground surface will cave in to the underground as well. Scoop trams or Load Haul Dump (LHD) vehicles transport the muck, loosened rocks, to an ore pass where the rocks are lifted to the surface. Drilling and blasting takes place at differ ent underground levels of the mine at the same time.As the blasted rock, muck, is continuously transported to the ore pass, more blasting will encourage the roof to cave in to the void and further into the drift. This is repeated until blasting, caving and transporting depletes the entire orebody. 2. Modern day Sublevel caving – The sublevel caving technique, as the method is applied today, the whole quantity of ore between the different sublevels is broken using ——————————————————————————————————Author: Partha Das Sharma, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/ 1Sublevel caving techniqueSimplicity and low cost are the essence controlled drilling and blasting. Sublevel caving is in many respe cts simple. It can be used in orebodies with very different properties and it is easy to mechanize. In sublevel caving, ore is developed from a series of sublevels spaced at regular intervals throughout the orebody. Mining begins at the top of the orebody. A series of ring patterns is drilled and blasted from each sublevel. Broken ore is mucked out after each blast and the overlying waste rock caves on top of the broken ore. This technique is inexpensive, highly mechanized and yields a large amount of muck.It is normally used in massive, steeply-dipping orebodies with considerable strike length. Since dilution and low recoveries are unavoidable, sublevel caving is used to mine lowgrade, low-value ore-bodies. However, studies are going on in various levels to eliminate the shortcoming of the system. The designs which are used and the measures which can be taken to eliminate the disadvantages are less understood. Possibly the modern version of the method was developed in the iron mine s of Sweden. Over the past few years, the scale of sublevel caving has increased markedly with LKAB being a leader in this regard.Today, with the continuing push to increase mining scale, a fundamental question is whether the gravity flow principles which served as the design basis for the small-scale sublevel caving mine designs of the past can be applied at much larger scales or whether some other approach is required. In fact, in design and operating practices, sublevel caving is among the most advanced of all mining methods. Sound engineering is indispensable to its conduct. The reason is related to the complexity of the caving action and the necessity of controlling it. The increased sublevel interval requires diligence in drilling, loading and blasting practices.The advent of improved drilling technology has made increased sublevel intervals possible in the sublevel cave mine. Hydraulic tube rod drill rigs have made long ——————— ———————————————————————————- 2 Author: Partha Das Sharma, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/ Sublevel caving techniqueSimplicity and low cost are the essence up-holes accurate with less than 2% deviation. Apart, blasting pattern used has also plays very important role.Proper fragmentation and blasting efficiency is evaluated by measuring the percentage of muck which is able to pass the designated blast size. 3. Description of sublevel caving method – An underground mining method used in large, steeply dipping orebodies where the wall rock is of an incompetent nature. Parallel drives are developed in the ore on equally spaced levels. The ore is then drilled and blasted using longholes between levels, often in a circular or fan pattern, on retreat. The weight of the rock is used to assist breakage. The upper levels are mined ahead of lower levels.Broken ore is extracted from the drive before the next blast takes place. The wall rock caves in when the ore is extracted. As discussed, in sublevel caving, the hanging wall is allowed to cave in as the ore is drilled, blasted and removed. The wall caving is induced by mining the ore in controlled sequence, usually from hanging wall to footwall and from top to bottom. Sublevel caving is often used in conjunction with surface mining. Sublevel caving extracts the ore via sublevels, which are developed in the orebody at regular vertical spacing. Each sublevel features systematic layout with parallel drifts, along or across the orebody.In the wide orebody, sublevel drifts start from the footwall drive, to continue across, reaching the hanging wall. In the orebody lesser width, sublevel drifts are branched off in both directions, from a centre crosscut drive. ——à ¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Author: Partha Das Sharma, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/ 3 Sublevel caving techniqueSimplicity and low cost are the essence Development volume to prepare sublevel caving is extensive, compared to other mining methods.However, development is mainly drifting to prepare sublevels. Drifting is a simple and routine job for the mechanised mine. Development of sublevels is done efficiently, in an environment of multiple faces on one sublevel available to drill rigs and loaders. A ramp connection is needed to connect different sublevels, and communicate with main transport routes. Ore passes are also required, at strategically locations along sublevels, for LHD-loaders to dump ore from sublevels, to be collected and transported on the haulage level below. —————————————————————————– ————————Author: Partha Das Sharma, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/ 4 Sublevel caving techniqueSimplicity and low cost are the essence Longhole rigs drill the ore section above the drift, in a fan spread pattern. Longhole drilling is a procedure which is done independent of other jobs, often well ahead of charging. Thus, drilling and charging-blasting longholes can be timed to suit the mine’s production schedules.Blasting on each sublevel starts at the hanging wall, mining then retreats toward the footwall. Miners aim the cave to follow an approximately straight front, and adjacent d rifts mined at similar pace. A section through the cave to show upper sublevels one step ahead of sublevels underneath. Blasting the longhole fan breaks the ore volume covered by the fan-pattern. As the cave is filled with fractured rock, most of the fresh ore remains in the cave, while some caves into the drift opening. Mucking out with LHD-loaders creates a cave pattern of ore and waste from above.Loading continues until the operator decides that waste dilution is too high, and stops the mucking, and transfers to a nearby drift heading with a fresh cave. In the meantime, the empty heading is occupied by the charging team, to charge next ring of longholes. Ore handling involves mucking out at the cave, transport on sublevels and dumping into ore passes. Waste dilution and ore losses are drawbacks for sublevel caving. Waste dilution varies between 15 and 40%, ore losses from 15 % to 25 %, depending on local conditions. Dilution is of less influence for orebodies with diffuse boundar ies, where the host rock contains low grades minerals.Parameters directly influence flow behaviour have been found to include the geometry of the extraction layout and drives, sublevel height, blast ring design, material characteristics of the blasted and waste material, and draw control methodology. In most of the sublevel caving system blasting parameters dominate in association with recovery when compared to drawpoint and geological parameters. Generally, sublevel caving method employs use of fan drilling using long and smalldiameter holes, between sublevels or drill drifts to undercut and blast the ore-zone. An initial slot is developed at the wallrock, and vertical uphole fans are rilled in a diamond pattern from sublevel in sequence. Generally, eight holes, inclined 80 to 85 degrees toward the slot, are drilled. Hole diameter average 51 mm, Burden and Spacing vary from 1. 2 to 1. 8 m and 1. 5 to 1. 8 m respectively. Blasting is performed against broken waste rock as wall rock caves. Generally, specific-charge range from 0. 3 to 0. 4 kg/ton. 4. Below are some salient features of Sublevel caving technique: Application * Weak walls and strong ore preferred though weak ore can be mined too. * Steep dip: A vertical dip is best, while dip>60 is fine too.Possibility of loss of ore in non-vertical steep dips Considerable loss of reserves in flat dips * Preferably, the ore and the rock should be easily separable * Surface should be amenable to caving (not an inhabited or the watershed area etc) ——————————————————————————————————Author: Partha Das Sharma, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/ 5 Sublevel caving techniqueSimplicity and low cost are the essence Development * Signif icant. Almost 20% of the ore is mine during development * Sublevels are established generally at 7. -12. 2 m vertical intervals and about 10. 7 m horizontal intervals The vertical interval is dependent on the drilling accuracy and the dip of the orebody The horizontal and vertical spacings affect the eccentricity of the cave * The size and shape of the production drift affects the draw Drift should be as wide as possible Should give good support to the back and the brows If the back is arched, the draw is mostly at the center and none on the sides If the back has to be arched for ground support, the drifts should be closer Ore remnants left behind (due to being out of reach of LHD’s) increase with height.Therefore, drift height should be as small as possible (usually about 3-3. 2 m). * Slot raises are driven at the hanging wall end of the production drift all the way up to the next level * Haulage levels driven in waste In wide orebodies, transverse layouts may be used (ore w idths should be > 12-15 m) Here, the production drifts are perpendicular to the strike Recovery better than longitudinal layouts Haulage drift in waste (footwall), about 9 m from ore contact. This distance is maintained so that blasting does not occur too close to it.Diamond drilling is done to obtain ore boundaries so that the haulage drift is neither too close nor too far away. o o * Ramps may be driven at 15 -18 , to production levels to provide access * Long, fan holes drilled 70-80 degrees forward (about 8 holes Production totaling 100 m in a ring) * Side holes, if drilled, should be steeper than 70 degree Side holes reduce length of holes driven up from the level below If flat holes drilled to the sides, however, the blasted material from the side holes cannot be extracted from the working level.Therefore, the neighboring fan hole blasted material does not get enough room to expand * Brows should be supported if necessary If brows collapse, ore floods the drift and covers some rings Also, the loader has problems loading as the ore does not stack high If brows are uneven, the ore funnels down the high spots ——————————————————————————————————- 6 Author: Partha Das Sharma, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/Sublevel caving techniqueSimplicity and low cost are the essence If sloughing or high brows are noticed from development, it may be decided to blast more than 2 rings just to advance through the area * If drilling is not accurate, a bridge/arch may be left in the stope Re-slotting may become necessary * Powder factor high as blasting is always against blasted muck (almost twice that of blasting against an open face) * LHD’s used for mucking * Good ventilation necessary as all working faces are dead ends * Productivity is quite high (about 36 ton/miner-shift) Comments * High dilution from caved waste.Ore losses occur as well since not all mined ore can be recovered. * Ore/waste flow cannot be predicted accurately prior to mining. * Probably the most economical when mining in weak strata * Development openings are not kept open for the entire life of mine. Once a level is extracted, the development openings are consumed. * Safe, since all mining activities are in small, protected openings. * High degree of mechanization possible. 5. Discussion on ore flow, drilling and blasting for efficient workings: * Fragmentation is of key importance to sublevel cave stope.Proper fragmentation of the ore column resulted in improved efficiency for the other mine operations and was critical to recovery. * Underground observations indicate that the draw-points must be wide enough to account for inconsistent blast results and provide regular flow. * The dr aw-point width determines the width and flow strength of the central channel which is important to achieving high recovery of the ring. * The middle holes of the ring are fired first and can make first use of the swell volume offered by the underlying sublevel drift. * The central holes are drilled subvertical, fairly parallel, and relatively close to one another.The result is a relatively high and uniform specific charge compared to the other holes in the round. Thus, one would expect the best, most uniform fragmentation. * The ore material in the central part of the round can make the best use of the effect of gravity in directing it to the drawpoint. * All of the material in the fan is drilled and blasted. * Because of the fan geometry, the amount of explosive/unit volume and hence the fragmentation varies throughout the fan. * The ore material in the centre part of the fan and the lower part of the fan has a much higher specific charge than that at the boundaries of the ring. Fu rthermore, the â€Å"cave† which lies in front of the blasted slice is an eclectic mixture of waste rock and ore remnants. * Its mobility varies with location and with time (it changes with the extraction geometry). ——————————————————————————————————Author: Partha Das Sharma, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/ 7 Sublevel caving techniqueSimplicity and low cost are the essence * Finally, most rock materials upon being blasted would like to bulk (swell) of the order of 50%. In sublevel caving, it is the sublevel drift located at the bottom end of the fan which is the primary provider of swell space for the ore in the ring. * It has been observed that, increased amounts of oversize in the r ing decreases recovery, proving the importance of proper fragmentation for sublevel cave operation. * Recoveries could be less than 60% if the ring is composed of 30% oversize. The oversize in the draw-point reduces the mobility of the ore, thus preventing high recovery. * Effective blast patterns also take into consideration the amount of benching. High powder factors are also required to reduce benching but may create excessive blast damage and over-break. * Practical solutions, such as, the blast pattern, blasthole size, primer sequencing, powder factor and degree of fragmentation are to be considered in order to be efficient. 6. Design parameters and some preliminary design rules – Design parameters in sublevel caving are largely a function of caving mechanics, the branch of rock mechanics related to the breakage and collapse of consolidated materials in place and their flow downward by gravity.Although, the ore has to be drilled and blasted, the overlying rock comprising capping or hanging wall is undercut and caves. Extremely careful controls must be exercised in drawing the ore to avoid excessive dilution. Draw control is the practice of regulating the withdrawal of ore in the sublevel crosscuts so as to optimize the economics of draw. Preliminary design rules: * Sublevel drift size (width (Wd) and height (Hd): determined based on equipment. * Sublevel interval (HS): the theoretical maximum value is based on the ability to drill long, straight holes.This, in turn, is based on the hole diameter (D). The actual limit is based on recovery and dilution considerations which are due to managing ore/waste pulsation. * Hole diameter (D): based on the available drilling equipment and the ability to charge long holes. * Spacing of the sublevel drifts (Sd): Sd = (2. 4 to 2. 7) Wd * Ring spacing (Burden B): Based upon the damage radius (Rd): B = 2 Rd Where: Rd/rh = 20 ( Peexp/PeANFO)? ( 2. 65/? rock)? ? Rd = damage radius (m); rh = hole radius (m); Peexp = e xplosion pressure for the explosive; PeANFO = explosion pressure for ANFO = 1600 MPa; ? ock = rock density (g/cm3); 2. 65 = density of typical rock (g/cm3). * Hole toe spacing (ST): based upon the burden ST = 1. 3 B. * Spacing for parallel holes (SP): based upon the burden SP = B. * Front inclination: 70–80 degrees (forward). Example: If it is assumed that: D = 115 mm; Drift dimensions: 7 m wide by 5 m high; Explosive: emulsion (Pe Exp = 3900 MPa); Rock density = 4. 6 g/cm3; Sublevel interval: 25 m based on drilling ability and control of pulsation. ——————————————————————————————————Author: Partha Das Sharma, E. ail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/ 8 Sublevel caving techniqueSimplicity and low cost are the essence One finds that the remaining dimensions are: Sublevel drift spacing: 17–19 m; Burden: 2. 7 m; Toe spacing (fanned): 3. 5 m; Toe spacing (parallel): 3 m; Front inclination: 80 degree selected. 7. Experience from LKAB, Sweden – Sub-level caving (SLC) is an important mass mining method, used at LKAB. The caved rock or debris at the SLC interface reduces the fragmentation and the swelling of the blasted ring and it dissipates the explosive energy.These phenomena may immobilize the blasted ring, causing ore losses. There are two major factors that influence the mobilization of the blasted ring, fragmentation and swelling of the blasted material. The caving process is influenced by also the stiffness of the waste rock, which is dependent in some way by the compaction that the blast ring contributes to. By using the acoustic impedance between the blasted material and the confining debris, a relationship for both fragmentation and compaction have been fou nd depending on material, specific charge and physical properties of the debris.Regression analysis has been used for both tasks, where the two statistical hypotheses clearly have good agreement with actual data i. e. the prediction models can forecast both the fragmentation and compaction for this set-up with reasonable accuracy The results can be comparable with confined blasting in large scale, this both that it have representative design parameters that fulfil in many ways the scaling laws and the second is that it can be linked to other comparisons between large-scale and small-scale, where the similarities have been shown.LKAB’s Malmberget – The Malmberget mine consists of about 20 orebodies, of which ten are currently mined. Most of the deposit consists of magnetite ore, but non-magnetic hematite also occurs. The present main level of the Malmberget mine is at a depth of 1000 meters. About 14 Mt of crude ore is extracted from the orebodies each year. Development – The first stage of mining is drift development. A drift is a tunnel that is driven into the rock. Development involves construction of new areas of the mine where ore can be extracted.A development project begins with construction documents prepared by the mine planning department. Each year, the mine planning department orders development work on the basis of the forecast demand for products as well as current knowledge of the status of the orebody. A development drift goes right through the orebody. Drifts are driven with electrichydraulic drill rigs. For each charge, as many as 60 holes are drilled. Each hole is about 5 meters deep. When all the holes are drilled, they are charged with explosives. The charge is blasted at night. The loose ore is then hauled out by a front loader.This procedure is repeated until the entire development drift has been driven. The drifts can be up to 80 meters long. If necessary, the walls and ceiling of the drift are reinforced with rock b olts and/or shotcrete. When development is complete, i. e. , when several drifts have been driven in the same area, the next stage of mining can begin; namely, production drilling. ——————————————————————————————————Author: Partha Das Sharma, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. ordpress. com/ 9 Sublevel caving techniqueSimplicity and low cost are the essence Production drilling – Slices of ore are drilled up with remote-controlled production drilling rigs. From their control rooms, the operators (drillers) operate several drill rigs out in the production areas via remote control. The rig drills upwards into the ore, forming fan-shaped patterns of holes. There are 10 drill holes in each series. They are no rmally about 40-45 meters deep. The holes are straight, so that subsequent charging with explosive and blasting can be done efficiently.When a pattern of holes has been drilled, the rig is moved back three meters, then drilling of the next pattern begins. About 20 of these patterns will be drilled in an 80-meter drift. Once drilling is completed in the entire drift, the holes can charged with explosive. Blasting – A robot injects explosive into the drill holes in one pattern. The explosive is manufactured by LKAB’s own explosives company. Blasting is done every night. Each round brings down about 10,000 tonnes of ore. When the blast has been ventilated, loading with wheeled loaders can begin.Then, the next pattern is charged, etc. The procedure is repeated until the entire drift has been mined out. 8. Conclusion – Caving methods have become the underground bulk mining methods of choice and expected to continue in the foreseeable future. The growing popularity of caving methods around the world is largely due to the very low production cost and the intrinsic safety associated with this mining approach. It is often the only viable mining method for some of the lower grade massive orebodies that are becoming too deep for open pit mining. Caving of strong rock masses has ecome accepted practice even though there are still some challenges to be resolved. Strategically, most medium and large mining companies are operating or planning to operate a caving mine. Codelco's El Teniente mine in Chile and the LKAB Kiruna Mine in Sweden are among the largest and most famous caving operations in the world. Australia’s leading caving operations include Rio Tinto's Northparkes mines, BHP Billiton Nickel West's Perseverance Mine and Newcrest's Telfer and Ridgeway gold mines. References: * Kvapil, R , â€Å"Subleve l Caving†, Underground Mining Methods Handbook. â€Å"d Edit ion, Vol. 2. , H. L. Hartman, ed. , SME. Littleton, CO, 1992, p. 1789 . * Geddes, P. J. , â€Å"Swedish Drilling and Blasting Practice†, Trans. Int. Min. Metail. , 1 986, Sect. A. , V. 95, p. 204-207. * Alatalo. R. , Heden, H. and Ronnback, L. , ‘large Scale Sublevel Caving in LKAB Malmberget Mine†, Proc. Int. Sym. Large Scale Underground hfining, Nov. 1985, V. 7. Lulea, p. 139- 145. * Baase, R. A. , Diment, W. D. , and Petrina, A. J. , â€Å"Sublevel Caving at Craigmont Mines Ltd. â€Å", Underground Mining Methods Handbook, W. A. Hustrulid, ed.. SME, New York, 1982, p. 898. Chatterjee, P. K. , Just, G. D. , and Ham, G. I.. ‘Sub-level caving simulation of 3000 pillar-recovery operation at Mount Isa mine. Australia†. Tram inst . min. & Met.. Sect. A. , V. 88.. Oct. 1979, p. Al47-Al55. —————————————————————————————â€⠀Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€Ã¢â‚¬â€- 10 Author: Partha Das Sharma, E. mail: [email  protected] com, Blog/Website: http://miningandblasting. wordpress. com/ Sublevel caving techniqueSimplicity and low cost are the essence * Cox, LA. , â€Å"Latest Developments and Draw Control in Sublevel Caving†, Trans.Int. Min Metall. , 1967, V. 76, p. A149-159. * Hustrulid. A. , â€Å"Sublevel Cave Mining at LKAB Kinina Mine†. iNCO presentation Aug. 1995. * Bull, G. and Page, C. H. (2000) Sublevel caving – today’s dependable low-cost ‘ore factory’, in Proceedings MassMin 2000, G. Chitombo (ed), 29 October to 2 November 2000, Brisbane, Australia, Australasian Institute of Mining and Metallurgy, Melbourne, pp. 537–556. * Hustrulid, W. and Kvapil, R. (2008) Sublevel Caving – past and future, in Proceedings 5th International Conference and Exhibition on Mass Mining, MassMin 2008, H. Schunnesson and

Logistics case Essay

Stanley received multiple calls from customers complaining about late shipments for both truck and rail delays. Transportation delays were measured in days, not hours. Railcar delivery windows increased from two to seven days, and overall truckload service levels fell to less than 85 percent on time. Due to rise in price of the transportation cost for MAP the cost of goods sold rose from 11 to 19 percent. The transportation problems led to a demand by MAP’s largest domestic customer. Stanley tells that even a 10 percent increase in inventory levels would reduce return on asset levels from 13.7 percent to 9.1 percent. MAP’s inventory investment is 22 percent of total assets and inventory carrying costs are nearing 27 percent of inventory value, both of which are consistent with manufacturing industry norms. The outbound logistics is an essential primary activity of the value chain no matter what industry. Question 2 Agricultural commodities and products from the Midwest are shipped to locations around the globe. If global demand continues to grow, how will different transportation modes (rail, truck and barge) be affected? How will these changes impact MAP’s current supply chain strategies? Answer: If the global demand continues to grow then there will be a tough time for the agriculture products which is being shipped from the Midwest to all locations around the globe as if there is a rise in demand then costs related with the different means of transportation will increase and the service levels will most likely fall, mainly with shipping the goods through water ways as demand for containers are increased, the fuel costs are higher and even due to slow steaming. The single railcar shipping rates are as closely as truckload shipments which will lead to decline in on-time transportation service which will cause customer dis-satisfaction. MAP’s service levels fell to less than 85% on time and the domestic customer demand is increased and there are complaints from customers all over the globe regarding the delay in receiving their product due to the deregulation in transportation which will lead to a negative effect on its current supply chain, MAP should place supplier-owned inventory in nearby storage facility or by positioning warehouses around the globe if not will lose 100% of its business. Question 3 Many factors influence location decisions. If MAP were to relocate a facility today, what factors would seem most important? Do MAP’s past location decisions limit or enable their future opportunities? Would your answer change if MAP was a large multi-national corporation? Answer: If MAP were to relocate to any other place, two points should be kept in mind:- Firstly, to relocate to areas where resources are in abundant as it’s the main source for their business. Secondly, transportation should be much easier and should be accessible to various areas. Distance from both suppliers and customers are important as when it comes to the efficiency of an operation suppliers are involved and delivery of goods to customers or key infrastructure is just as important. It’s better off if MAP does not relocate its facilities because in its current location in the Midwest it offers an abundance of corn and soyabean suppliers which is the main source of MAP’s business. Since transportation is the main problem for MAP, but after Mary’s talk with various other Midwest shippers to better utilize the existing transportation infrastructure it looks like a bright future ahead. I believe a large organization would choose to locate in a similar fashion, b ut would also strive to choose a location with easy access to rail and highways. Question 4 Manly Terminal LLC successfully enables modal shifts from truck to rail transportation, and specifically to unit-train pricing, for ethanol shippers producing single carload shipment sizes. What prevents MAP from realizing these same rate advantages? Can these challenges be overcome? How? Answer Map is unable to realize these same advantages for a few reasons: Poor model optimization. MAP is not located near a major national and international railroad hub. They are in fact only shipping single carloads, but an individual car costs a fair amount more when we are not speaking about a until-train. With the right partnership, I believe those problems could be overcome. Question 5 Manly Terminal LLC offers the ethanol industry exciting supply chain solutions. Are the ethanol industry’s transportation needs similar to any other sectors? Could Manly Terminal expand to serve other industries? Which sectors should they target? Answer The requirements for shipping ethanol sound very similar to what we believe it would take to ship corn syrup or soybean oil. Manly could service almost any liquid bulk product. Manly terminal are already located in the Midwest servicing corn refineries for ethanol. They can also service the corn refineries for other by-products to make corn sweetener’s, refined corn feed products, starch, corn oil, ethanol and other bio-products. Manly terminal can target the sectors or industries who ship grains, biofuels/bioenergy and products involved in trans loading.