Incwadi Yami; or, twenty years' personal experience in South Africa

by J. W. Matthews

DIAMOND WASHING MACHINE.

First of all came the “Long Tom,” a trough fitted with ripples, into the head of which the gravel was thrown, and through which a constant flow of water drawn from the river was maintained, while the gravel was raked and the larger stones and pebbles removed, the fine gravel found behind the ripples being taken away to the sorting tables. To this contrivance succeeded the “cradle,” a wooden box placed upon rockers and pulsated upon a flat piece of ground or rock by means of a handle. The cradle contained three sieves, the first very coarse and the third extremely fine. Into the first the mud and gravel were poured, a constant flow of water being of course kept up. When the mud had disappeared the first sieve was hand-sorted, and loud indeed were the shouts of acclamation and universal was the adjournment to the nearest liquor tent when a diamond was found in this receptacle. The contents of sieves Nos. 2 and 3 were then emptied on different ends of the sorting table.

Both these appliances were introduced by old gold diggers, and were similar in construction to their Californian and Australian namesakes.

Third in order came the “baby,” so-called from its inventor, a Mr. Babe, an American. Three screens, somewhat similar to those used by bricklayers in making mortar, were suspended by reins (leather thongs) almost horizontally to four posts, and were kept in agitation by hand, the reins of course giving full play for “pulsation.” The subsequent process was nearly identical with that above described in connection with the cradle, which this machine indeed resembled in principle, though a decided improvement, as much more work could be accomplished with the aid of this invention than with the assistance of its predecessor.

Fourth in order came the “cylinder,” constructed of either wire sieving (10 inch mesh) or punched sheet iron fitted with lids, revolving on an axle, kept moving by a handle immersed in a tub of water. The gravel before being shut up in a cylinder was screened. This was found to be an excellent contrivance for saving labor, and was highly popular, as obviously the natives could have no opportunity of purloining diamonds from it, as it was only opened for the pouring out of the contents under the digger’s personal supervision, or perchance the observing eye of the partner of his joys and sorrows. It is perhaps unnecessary to add that after these machines had come into general use, many, especially the impecunious diggers, amongst whom were many Dutchmen, with overwhelmingly large families, did as best they could with a single sieve, which served as pulsator and everything beside. To-day even, many use this primitive appliance at the river.

Before passing on to the Dry Diggings and the systems that there prevailed, it may be as well to briefly describe the “sorting table.” The top of a packing-case balanced on a heap of gravel often had to serve this purpose in the early days of the river diggings, and beside it the digger knelt, crouched or sat, changing his position when it became too wearisome. The more affluent had a sorting table supported by legs, and covered with a sheet of iron, being slightly inclined from the digger, so that the water might not flow into his lap when the gravel was poured out in front of him. Those of my readers who visited the Cape court in the “Colinderies” have seen a sorting table almost if not quite identical with the best constructed of the early days. The “scraper,” too, which, though small in size and inexpensive in material, is yet an important instrument in diamond winning, has but little altered. This little wonder is not much to look at, being simply a piece of tin or iron about six to nine inches in width and three to four inches in height, with a straight edge and pointed ends. With this the sorter scrapes—scrapes—scrapes, pushing over the edge of his sorting table, garnets, jaspers, carbons, agates, pyrites, crystals and pebbles, which, however interesting to the scientist, are commercially valueless, until at last a diamond is found, and then the precious stone, large or small, is dropped into an unpretentious tin or perhaps a broken bottle, and the process goes on as before.

At the dry diggings sieving and hand-sorting were at first the usual methods employed, and it was long before even so much ingenuity as was required to construct an improved or altered cradle was brought into play. The processes named, however, being so wearisome and exhausting, they were at last abandoned; and among other labor-saving appliances one, for which much kudos was gained by the inventor or adapter—a Mr. Van Doussa—was largely used, but does not need detailed description, as it was simply a combination of the Long Tom and the cradle.

Before describing the elaborate washing machines, etc., in vogue to-day, I will proceed to give my readers some idea of the successive methods by which the diamondiferous soil has been removed from the claims for manipulation. The Kimberley mine attracting by its marvelous richness diggers from other mines was, at the time of its opening, and indeed still is, a wondrous hive of human industry. In the earliest days the sorting tables were placed in the claims themselves, and marvelous were the scenes that then might daily be observed. In a space of some dozen acres were often gathered together as many as ten thousand people; diggers with their wives, sisters and children, busily engaged in sorting; natives shoveling the earth into buckets ceaselessly, the whole scene dotted with myriad parasols and umbrellas of the most varied hues, and awnings of the most gayly-colored blankets. The example of Horace’s “magni formica laboris,” that insect to which Mr. Eugene Wrayburn objected to King Solomon referring him, was closely followed by thousands filled with sanguine hopes, some doomed to bitter disappointment, but full many destined in greater or lesser degree to have their realization.

After a time, however, as the claims were worked deeper, it was found more convenient to have the sorting tables placed outside the mine. I may here mention that in order to facilitate work, roads were reserved running across the mine from north to south. They were some fourteen in number, and 7½ feet being allowed from the claims on each side, were 15 feet broad. On these roads the native laborers tossed the ground, most of which was conveyed to the sorting tables outside the mine, but some to tables placed upon the sides of the road. The waste ground out of which the diamonds had been sorted was of course deposited outside the mine,[^[31]] after having been conveyed along the roads in sacks or buckets, or sometimes in wheelbarrows or carts, by the “boys,”[^[32]] the name by which the native employés were entitled.

As the mine became yet deeper the system of “benches” came into vogue. There were levels or terraces cut in the side of a claim, and on each of them was posted a native who shoveled up the ground thrown to him from the level below, until at last the precious soil reached the roadway, where a fourth or perhaps a fifth native was waiting to convey it to its destination. Of course the number of benches varied with the depth of the claim.