Chapter Twenty.
The Mine in the Sea
True to their appointment, young Tregarthen and Oliver Trembath met at the western end of the town of Penzance, close to the sea-beach, where a mass of buildings and a chimney indicated the position of the Wherry Mine.
Oliver’s countenance betrayed anxiety as he came forward.
“Nothing wrong, I hope?” said Tregarthen.
“Well, I can’t say exactly that things are wrong; but, at the same time, I don’t know that they are altogether right.”
“Much the same thing,” said Tregarthen, smiling; “come, Oliver, unbosom yourself, as novelists say. It will do you good, and two heads, you know, are better than one.”
“It’s not easy to unbosom myself, old fellow,” returned Oliver, with a troubled look; “for my poor uncle’s affairs are in a perplexed condition, and I hate explanations, especially when I don’t understand the nature of what I attempt to explain, so we’ll not talk about it, please, till after our visit to the mine. Let it suffice to say that that notorious smuggler Jim Cuttance is concerned in it, and that we must go to Newlyn this afternoon on a piece of business which I shall afterwards disclose. Meanwhile, where is this mine?”
“Lift up your eyes and behold,” said Tregarthen, pointing to an object which was surrounded by the sea, and stood above two hundred yards from the beach.
“What! that martello-tower-like object?” exclaimed Oliver in much surprise.
“Even so,” replied Tregarthen, who thereupon proceeded to give his friend a history and description of the mine—of which the following is the substance:—
At the western extremity of the sea-beach at Penzance there is a reef of sunken rocks which shows its black crest above water at low tide. It was discovered that this reef contained tin, and the people of the town attacked it with hammers and chisels, when each receding tide left it exposed, as long as the seasons would permit, until the depth became unmanageable. After having been excavated a few fathoms the work was abandoned.
Fortunately for the progress of this world there exist a few enterprising men whom nothing can discourage, who seem to be spurred on by opposition, and to gather additional vigour and resolution from increasing difficulties. These men are not numerous, but the world is seldom without a few of them; and one made his appearance in Penzance about the end of last century, in the person of a poor miner named Thomas Curtis. This man conceived the bold design of sinking a shaft through this water-covered rock, and thus creating a mine not only under, but in the sea.
With the energy peculiar to his class he set to work. The distance of the rock from the beach was about two hundred and forty yards; the depth of water above it at spring tides about nineteen feet. Being exposed to the open sea, a considerable surf is raised on it at times by the prevailing winds, even in summer; while in winter the sea bursts over with such force as to render all operations on it impossible.
That Curtis was a man of no common force of character is obvious from the fact that, apart from the difficulties of the undertaking, he could not expect to derive any profit whatever from his labour for several years. As the work could only be carried on during the short period of time in which the rock was above water, and part of this brief period must necessarily be consumed each tide in pumping out the water in the excavation, it of course progressed slowly. Three summers were consumed in sinking the pump-shaft. After this a framework, or caisson, of stout timber and boards, was built round the mouth of the shaft, and rendered watertight with pitch and oakum. It rose to a height of about twelve feet above the surface of the sea, and was strengthened and supported by stout bars, or buttresses of timber. A platform was placed on the top, and a windlass, at which four men could work, was fixed thereon. This erection was connected with the shore by a stage or “wherry” erected on piles. The water was cleared out; the men went “underground,” and, with the sea rolling over their heads, and lashing wildly round the turret which was their only safeguard from terrible and instant destruction, they hewed daily from the submarine rock a considerable portion of tin.
These first workers, however, had committed an error in carrying on their operations too near the surface, so that water permeated freely through the rock, and the risk of the pressure above being too great, for it rendered the introduction of immense supporting timbers necessary. The water, too, forced its way through the shaft during the winter months, so that the regular working of the mine could not be carried on except in summer; nevertheless, this short interval was sufficient to enable the projector to raise so much ore that his mine got the reputation of being a profitable adventure, and it was wrought successfully for many years.
About the end of the century the depth of the pump-shaft was about four fathoms, and the roof had been cut away to the thinness of three feet in some places. Twelve men were employed for two hours at the windlass in hauling the water, while six others were “teaming” from the bottom into the pump. When sufficient water had been cleared away the men laboured at the rock for six hours—in all, eight hours at a time. The prolific nature of the mine may be gathered from the fact that in the space of six months ten men, working about one tenth of that time—less than three weeks—broke about 600 pounds worth of ore. During one summer 3,000 pounds worth of tin was raised!
A steam-engine was ultimately attached to the works, and the mine was sunk to a depth of sixteen fathoms, but the expense of working it at length became so great that it was abandoned—not, however, before ore to the amount of 70,000 pounds had been raised from under the sea!
At the time of our tale another effort had been made to work the Wherry Mine, and great expectations had been raised, but these expectations were being disappointed. Our unfortunate friend Mr Donnithorne was among the number of those who had cause to regret having ventured to invest in the undertaking, and it was to make inquiries in regard to certain unfavourable rumours touching the mine that Oliver Trembath had been sent to Penzance.
After inspecting Wherry Mine the two friends walked along the shore together, and Oliver explained the nature of the difficulties in which his uncle was involved.
“The fact is, Charlie,” he said, “an old fish-purchaser of Newlyn named Hitchin is one of the principal shareholders in this concern. He is as rich, they say, as Croesus, and if we could only prevail on him to be amiable the thing might be carried on for some time longer with every hope of a favourable result, for there can be no doubt whatever that there is plenty of tin in the mine yet, and the getting of it out is only a question of time and capital.”
“A pretty serious question—as most speculators find,” said Tregarthen, laughing; “you appear to think lightly of it.”
“Well, I don’t pretend to know much about such matters,” replied Oliver, “but whatever may be the truth of the case, old Hitchin refuses to come forward. He says that he is low in funds just now, which nobody seems to believe, and that he owes an immense sum of money to Jim Cuttance, the smuggler, for what, of course, he will not tell, but we can have no difficulty in guessing. He says that Cuttance is pressing him just now, and that, therefore, he cannot afford to advance anything on the mine. This being the case it must go down, and, if it does, one of the last few gleams of prosperity that remain to my poor uncle will have fluttered away. This must be prevented, if possible, and it is with that end in view that I purpose going to Newlyn this afternoon to see Hitchin and bring my persuasive powers to bear on him.”
“H’m, not of much use, I fear,” said Tregarthen. “Hitchin is a tough old rascal, with a hard heart and a miserly disposition. However, it may be worth while to make the attempt, for you have a very oily tongue, Oliver.”
“And you have an extremely impudent one, Charlie. But can you tell me at what time the mackerel boats may be expected this evening, for it seems the old fellow is not often to be found at home during the day, and we shall be pretty sure to find him on the beach when the boats arrive?”
Thus appealed to, Tregarthen cast a long look at the sea and sky.
“Well, I should say, considering the state of the tide and the threatening appearance of the sky, we may expect to see them at six o’clock, or thereabouts.”
“That leaves us nearly a couple of hours to spare; how shall we spend it?” said Oliver.
“Go and have a look at this fine old town,” suggested Tregarthen. “It is worth going over, I assure you. Besides the town hall, market, museum, etcetera, there are, from many points of the surrounding eminences, most superb views of the town and bay with our noble St. Michael’s Mount. The view from some of the heights has been said by some visitors to equal that of the far-famed Bay of Naples itself.”
“Part of this I have already seen,” said Oliver, “the rest I hope to live to see, but in the meantime tin is uppermost in my mind; so if you have no objection I should like to have a look at the tin-smelting works. What say you?”
“Agreed, by all means,” cried Tregarthen; “poor indeed would be the spirit of the Cornishman who did not feel an interest in tin!”
Chapter Twenty One.
Treats of Tin-Smelting and other Matters
There is something grand in the progress of a mechanical process, from its commencement to its termination. Especially is this the case in the production of metals, nearly every step in the course of which is marked by the hard, unyielding spirit of vis inertiae on the one hand, and the tremendous power of intelligence, machinery, and manual dexterity on the other.
Take, for example, the progress of a mass of tin from Botallack.
Watch yonder stalwart miner at work, deep in the bowels of the mine. Slowly, with powerful blows, he bores a hole in the hard rock. After one, two, or three hours of incessant toil, it is ready for the powder. It is charged; the match is applied; the man takes shelter behind a projection; the mass is rent from its ancient bed, and the miner goes off to lunch while the smoke is clearing away. He returns to his work at length, coughing, and rubbing his eyes, for smoke still lingers there, unable, it would seem, to find its way out; and no wonder, lost as it is in intricate ramifications at the depth of about one thousand five hundred feet below the green grass! He finds but a small piece of ore—perhaps it is twice the size of his head, it may be much larger, but, in any case, it is an apparently poor return for the labour expended. He adds it, however, to the pile at his side, and when that is sufficiently large fills a little iron wagon, and sends it up “to grass” through the shaft, by means of the iron “kibble.” Here the large pieces of ore are broken into smaller ones by a man with a hammer; as far as the inexperienced eye can distinguish he might be breaking ordinary stones to repair the road! These are then taken to the “stamps.”
Those who have delicate nerves would do well to keep as far as possible from the stamps of a tin-mine! Enormous hammers or pounders they are, with shanks as well as heads of malleable-iron, each weighing, shank and head together, seven hundredweight. They are fearful things, these stamps; iron in spirit as well as in body, for they go on for ever—night and day—wrought by a steam-engine of one hundred horse-power, as enduring as themselves. The stamps are so arranged as to be self-feeders, by means of huge wooden troughs with sloping bottoms, into which the ore is thrown in quantities sufficient to keep them constantly at work without requiring much or constant attendance. Small streams of water trickle over the ore to keep it slowly sliding down towards the jaws, where the stamps thunder up and down alternately. A dread power of pounding have they, truly; and woe be to the toe that should chance to get beneath them!
The rock they have to deal with is, as we have said, uncommonly hard, and it enters the insatiable mouth of the stamps about the size of a man’s fist, on the average, but it comes out from these iron jaws so exceeding fine as to be incapable of thickening the stream of reddish-yellow water that carries it away. The colour of the stream is the result of iron, with which the tin is mingled.
The particles of tin are indeed set free by the stamps from solid bondage, but they are so fine as to be scarcely visible, and so commingled with other substances, such as iron, copper, sulphur, etcetera, that a tedious process of separation has yet to be undergone before the bright metal can be seen or handled.
At the present time the stream containing it is poured continuously on several huge wooden tables. These tables are each slightly raised in the centre where the stream falls, so that all the water runs off, leaving the various substances it contains deposited on the table, and these substances are spread over it regularly, while being deposited, by revolving washers or brushes.
Tin, being the heaviest of all the ingredients contained in the stream, falls at once to the bottom, and is therefore, deposited on the head or centre of the table; iron, being a shade lighter, is found to lodge in a circle beyond; while all other substances are either spread over the outer rim or washed entirely away. When the tables are full—that is, coated with what appears to be an earthy substance up wards of a foot in depth—the rich tin in the centre is carefully cut out with shovels and placed in tubs, while the rest is rewashed in order that the tin still mingled with it may be captured—a process involving much difficulty, for tin is so very little heavier than iron that the lighter particles can scarcely be separated even after repeated and careful washings.
In old times the tin was collected in large pits, whence it was transferred to the hands of balmaidens (or mine-girls) to be washed by them in wooden troughs called “frames,” which somewhat resembled a billiard table in form. Indeed, the frames are still largely employed in the mines, but these and the modern table perform exactly the same office—they wash the refuse from the tin.
Being finally cleansed from all its impurities, our mass of tin bears more resemblance to brown snuff than to metal. An ignorant man would suppose it to be an ordinary earthy substance, until he took some of it in his hand and felt its weight. It contains, however, comparatively little foreign substance. About seventy per cent of it is pure tin, but this seventy per cent is still locked up in the tight embrace of thirty per cent, of refuse, from which nothing but intense fire can set it free.
At this point in the process, our mass of tin leaves the rough hand of the miner. In former days it was divided among the shareholders in this form—each receiving, instead of cash, so many sacks of tin ore, according to the number of his shares or “doles,” and carrying it off on mule or horse back from the mine, to be smelted where or by whom he pleased. But whether treated in this way, or, as in the present day, sold by the manager at the market value, it all comes at last to the tin-smelter, whose further proceedings we shall now follow, in company with Oliver and his friend.
The agent of the smelting company—a stout, intelligent man, who evidently did “knaw tin”—conducted them first to the furnaces, in the neighbourhood of which were ranged a number of large wooden troughs or bins, all more or less filled with tin ore. The ore got from different mines, he said, differed in quality, as well as in the percentage of tin which it contained. Some had much iron mixed with it, in spite of all the washings it had undergone; some had a little copper and other substances; while some was very pure. By mixing the tin of different mines, better metal could be procured than by simply smelting the produce of each mine separately. Pointing to one of the bins, about three yards square, he told them it contained tin worth 1,000 pounds. There was a large quantity of black sand in one of the bins, which, the agent said, was got by the process of “streaming.” It is the richest and best kind of tin ore, and used to be procured in large quantities in Cornwall—especially in ancient times—being found near the surface, but, as a matter of course, not much of that is to be found now, the land having been turned over three times in search of it. This black sand is now imported in large quantities from Singapore.
The agent then conducted his visitors to the testing-house, where he showed them the process of testing the various qualities of tin ore offered, to the House for sale. First he weighed out twenty parts of the ore, which, as we have said, resembled snuff. This, he remarked, contained about five-sixths of pure tin, the remaining one-sixth being dross. He mixed it with four parts of fine coal dust, or culm, and added a little borax—these last ingredients being intended to expedite the smelting process. This compound was put into a crucible, and subjected to the intense heat of a small furnace for about twenty minutes. At the end of that time, the agent seized the crucible with a pair of tongs, poured the metal into an iron mould, and threw away the dross. The little mass of tin thus produced was about four inches long, by half an inch broad, and of a dull bluish-grey colour. It was then put into an iron ladle and melted, as one would melt lead when about to cast bullets, but it was particularly noteworthy here, that a very slight heat was required. To extract the metal from the tin ore, a fierce heat, long applied, was necessary, but a slight heat, continued for a few minutes, sufficed to melt the metal. This remelted metal was poured into a stone mould, where it lay like a bright little pool of liquid silver. In a few seconds it solidified, retaining its clear purity in all its parts.
“That,” said the agent, “is tin of the very best quality. We sell it chiefly to dyers, who use it for colouring purposes, and for whom no tin but the best is of any use. I will now show you two other qualities—namely, second and inferior.”
He went to a small cupboard as he spoke, and took therefrom a small piece of tin which had already gone through the smelting process in the crucible above described. Melting this in the ladle, he poured it into the mould, where it lay for a few moments, quite bright and pure, but the instant it solidified, a slight dimness clouded its centre.
“That,” explained the agent, “is caused by a little copper which they have failed to extract from the tin. Such tin would not do for the dyers, but it is good for the tin-plate makers, who, by dipping thin sheets of iron into molten tin, produce the well-known tin-plates of which our pot-lids and pans, etcetera, are manufactured. This last bit, gentlemen,” he added, taking a third piece of tin from the cupboard, “is our worst quality.”
Having melted it, he poured it into the mould, where it assumed a dull, half-solid appearance, as if it were a liquid only half frozen—or, if you prefer it, a solid in a half molten state.
“This is only fit to mix with copper and make brass,” said the agent, throwing down the mould. “We test the tin ore twice—once to find out the quantity of metal it contains, and again to ascertain its quality. The latter process you have seen—the former is just the same, with this difference, that I am much more careful in weighing, measuring, etcetera. Every particle of dross I would have collected and carefully separated from any metal it might contain; the whole should then have been reweighed, and its reduction in the smelting process ascertained. Thus, if twenty parts had been the weight of tin ore, the result might perhaps have been fourteen parts of metal and six parts of dross. And now, gentlemen, having explained to you the testing process, if you will follow me, I will show you the opening of one of our furnaces. The smelting-furnace just shows the testing process on a large scale. Into this furnace, six hours ago,” he said, pointing to a brick erection in the building to which he led them, “we threw a large quantity of tin ore, mingled with a certain proportion of culm. It is smelted and ready to be run off now.”
Here he gave an order to a sturdy man, who, with brawny arms bared to the shoulders, stood close at hand. He was begrimed and hairy—like a very Vulcan.
Seizing an iron poker, Vulcan probed the orifice of the furnace, and forthwith there ran out a stream of liquid fire, which was caught in an iron bowl nearly four feet in diameter. The intense heat of this pool caused the visitors to step back a few paces, and the ruddy glow shone with a fierce glare on the swart, frowning countenance of Vulcan, who appeared to take a stern delight in braving it.
Oliver’s attention was at once attracted to this man, for he felt convinced that he had seen his face before, but it was not until he had taxed his memory for several minutes that the scene of his adventure with the smugglers near the Land’s End flashed upon him, when he at once recognised him as the man named Joe Tonkin, who had threatened his life in the cavern. From a peculiar look that the man gave him, he saw that he also was recognised.
Oliver took no further notice of him at the time, however, but turned to watch the flow of the molten tin.
When the iron cauldron was almost full, “slag,” or molten refuse began to flow and cover the top of the metal. The hole was immediately plugged up by Vulcan, and the furnace cleared out for the reception of another supply of ore. The surface of the tin was now cleared of slag, after which it was ladled into moulds and allowed to cool. This was the first process completed; but the tin was still full of impurities, and had to undergo another melting and stirring in a huge cauldron. This latter was a severe and protracted operation, which Vulcan performed with tremendous power and energy.
In reference to this, it may interest the reader to mention a valuable discovery which was the result of laziness! A man who was employed in a tin-smelting establishment at this laborious work of stirring the molten metal in order to purify it, accidentally discovered that a piece of green wood dropped into it had the effect of causing it to bubble as if it were boiling. To ease himself of some of his toil, he availed himself of the discovery, and, by stirring the metal with a piece of green wood, caused such a commotion that the end in view was accomplished much more effectually and speedily than by the old process. The lazy man’s plan, we need scarcely add, is now universally adopted.
The last operation was to run the metal into moulds with the smelter’s name on them, and these ingots, being of portable size, were ready for sale.
While the agent was busily engaged in explaining to Charles Tregarthen some portions of the work, Oliver stepped aside and accosted Joe Tonkin.
“So, friend,” he said, with a smile, “it seems that smuggling is not your only business?”
“No, sur, it ain’t,” replied Joe, with a grin. “I’m a jack-of-all-trades—a smelter, as you do see, an’ a miner also, when it suits me.”
“I’m glad to hear it, my man, for it gives you a chance of coming in contact with better men than smugglers—although I’m free to confess that there is some good among them too. I don’t forget that your comrade Jim Cuttance hauled me out of the sea. Where is he?”
“Don’t knaw, sur,” replied Tonkin, with an angry frown; “he and I don’t pull well together. We’ve parted now.”
Oliver glanced at the man, and as he observed his stern, proud expression of face, and his huge, powerful frame, he came to the conclusion that Cuttance had met a man of equal power and force of character with himself, and was glad to get rid of him.
“But I have not gi’n up smuggling,” added the man, with a smile. “It do pay pretty well, and is more hearty-like than this sort o’ thing.”
“I’d advise you to fall back on mining,” said Oliver. “It is hard work, I know, but it is honest labour, and as far as I have seen, there does not appear to be a more free, hearty, and independent race under the sun than Cornish miners.”
Joe Tonkin shook his head and smiled dubiously.
“You do think so, sur, but you haven’t tried it. I don’t like it. It don’t suit me, it don’t. No, no; there’s nothin’ like a good boat and the open sea.”
“Things are looking a little better at Botallack just now, Joe,” said Oliver, after a pause. “I’d strongly advise you to try it again.”
The man remained silent for a few minutes, then he said,—“Well, Mr Trembath, I don’t mind if I do. I’m tired o’ this work, and as my time is up this very day, I’ll go over to-morrow and see ’bout it. There’s a man at Newlyn as I’ve got somethin’ to say to; I’ll go see him to-night, and then—”
“Come along, Oliver,” shouted Tregarthen at that moment; “it’s time to go.”
Oliver bade Tonkin good-afternoon, and, turning hastily away, followed his friend.
The two proceeded arm in arm up Market-Jew Street, and turning down towards the shore, walked briskly along in the direction of the picturesque fishing village of Newlyn, which lies little more than a mile to the westward of Penzance.