Arizona republican., 1911-04-08

one on which the greatest hope of the owners is based. is 300 feet wide. and on this ledge the miners have drifted sixty-five feet, opening up a promis ing ore body. Other shafts and tun- nels have been driven with equally promising result, and it is the opinion of Mir. Harris, who returned with a bushel of specimens, that his property is going to gain recognition after a while as one of the richest that has so far been located in this country. A small body of men are kept at work. and the development will go right along.
 MT. Harris has had a wide experi-'
 ence in mining, having worked in Grip ole Creek in the early days, since
 which time he has been interested in
 number of big producing mines of the
 west. He stated yesterday that pro-
 vided the work done on his properties this year are as favorable as he anti cipates. his company will erect a con- centration mill on the Agua Fria. which will furnish the water for its opera
 ton. The capital is $l,0O0O00 fully paid up, with non-assessable stock, it l being specially provided in the articles
 of incorporation that no indebtedness
 shall be contracted by the company. During a long conversation on min ing matters yesterday MT. Harris said that he had a large holding in the J. P. Karns Tunneling Machine company
 of Boulder, Colorado, and that he had | been associated with MT. Karns ever since he conceived the idea of his ma
 chine, which has attracted considerable attention in mining circles. The con
 trivance was tested recently in the coal mines near Johnstown, Pa, and in a
 newspaper of that city dated March
 9th description was given of the sat
 isfactory results which had attended
 the first demonstration of the machine.
 The machine bids fair to revolutionize
 tunnel work. The company was or
 ganized in 1904, and first built a ma chine capable of cutting 52-Inch hole. Next a machine with 6-foot head was
 built. and upon his experiments were made for several years, parts that seemed weak being strengthened, and improvements constantly being made. At this time the officials of the Karns company are confident that they have perfected machine, and the recent test would seem to bear out that be- lief. The company has done very lit tie commercial work yet, many con- tracts being refused for the reason that it was desired to perfect a machine that would do the work under any and all conditions before accepting any of- fers
 The tunneling machine is built in the form of large ram with great cutters on the head, run by compressed air, which strikes the mountain to be tunneled with force of more than seven tons behind it. With a 6-inch stroke the head of the ram crashes into the rock and runs at the rate of about 120 strokes a minute, the mass torn down being carried away by a powerful water flush underneath. As the ram is drawn back after a stroke the cutters turn slightly, giving the knives a new place to cut, this operation being con- tinued indefinitely. It is not necessary to lay track for the machine as it progresses, as it carries its own track series of wheels and it runs along on the hard semi-circular floor cut | out of the solid rock. To tunnel up- ward, downward. or on either side, l all that is necessary is a readjustment | of these wheels, and the immense ma chine goes in any direction its operators | desire. The machine tunnels through | solid rock at the rate of about thirty | feet in eight hours, and there will no doubt be a wide sale for it in the mining states of the west during the next few years.
 Mir. Harris left last night for Los and expects to return to Ari- zona in few months to keep in touch with the development work on his property. He expresses himself very much pleased with the present showing. and is optimistic of seeing the claims