Bisbee daily review., 1911-07-26


 operations one a larger scale are begun a wagon road will easily be constructed for l2 miles which will connect with the regular wagon road to the railroad. and which will make the mine only about 9 miles from the railway. This haul can be a great deal bettered later on, and doubtless if operations here forward on the large scale the country and naturalization justi1es there win be a railway up the Aaravaipa can. yon and within : or miles of the Royal Tinto mine.
 interesting information.
 The principal vein of the Royal Tinto follows and is associated with a strong porphyry dyke which tra- verses the country in almost a north and south direction. Oftentimes the vein is covered with a very heavy gossan, which itself will oftenUmes show copper stain. This gossan is from , to 90 feet in thickness, and when it is removed the ore-bearfng material is found to be a quartz-pon phyry. usually somewhat breviafcd and on the south end e the aroa- tTNh que to be greatly bre.iatec n.
 main vein is from 20 10 75 feet wide. In some places a lime flow covers the vein for several hundred feet, and in other places in the vein there will be small porphyritic intrusions, always heavily mineral. ized, and sometimes the gangUe Is a very strong and productive one, as Is evidenced by the enormous leach ing that is shown in the property where uncovered. There is some ore all along in the workings, but this is where the teaching has not been of sufficient duration to take all the values from the gangue where it is heavy in iron. This is another interesting phase Of the deDoslt-- there are quantities Of hematite and specuiar iron, and al one point in a cross cut in the ore the iron has replaced the lime this being quite apparent and of more than ordinary interest. The ore in the work is not of commercial value, but the extent of the leached ground, and the evi- dence Of its once extremely heavy naturalization are indications suffi- cient to go to whatever depth is necessary to reach the zone of sec ondary enrichment. which should not now exceed 100 feet at any place where considerable work has been done, for water level is not ex- tremely deep in any portion or the Royal Tinto territory In fact, winze sunk for l5 feet in the tun- nel in the north cad of the property 4n hz al inflow of water exceeded their pumping capacity without machinery. This leads to the belief that the zone of secondary enrichment is less than 9 feet deeper than pres ent tunnel levels. but of course any mining would make the next level 100 feet deeper There Is a showing in both the long tunnels sufficient to Justify the installation of all the machinery necessary to sink 100 and more feet, and to take care of the water at the same time. The tunnels are not far apart, on the same vein, but are separated by a small canyon, where there is a fault in the vein. The north tun, mel is an adit and here there is every incentive for immediate work to depth. In the other tunnel the inducement is to push forward couple of hundred feet, when the main vein will be crosscut at a depth of approximately 500 feet. This will of course demonstrate whether this vein has been leached to the same depth as the vein across the creek; but in this case another 100 feet of depth, driven from the face of the tunnel. would put this work also into secondary ore body-in all probability into tho sulphides
 Geological Legend.
 The geological legend of the country about the Royal Tinto shows ganite, schist, limestone, rhyolite, andesite, quartz, quartzite. Much hematite and specular iron is noted There is some of the Pinal schist. and sometimes the granite has been so altered as to make it look like diorite. The north workings show the country in place. while thr soufh tunnel is badly shattered and tnzer was crosscrt 300 feet from tse po
 tai. but the tunnel was pushed on 900 feet further and before 1t is AAAAoncN lN VIII uftAt DtEu GE1NEN du- ether I60 feet. when it will have cut the main vein, and given backs Of more than 800 feet. The vein cut In this tunnel is heavily mineraIized. the hematite being strong; it having in places even replaced the lime There are several varieties of lime noted here, including mammoth spar and some dol0mite Several smaller reefs of mineralized Quartzite were crossed fin driving this tunnel, as well as several pOrphyry intrusions The lime flows are now nearly hori- zontal, but this is due 10 action Of the earth after the lime was lain down. In a crosscut in the south tunnel the slickensides show the action to have been heavy and Of considerable duration. This fact has considerable to do with the mining conditions. When the volcanic or seismatic disturbances came they caused a fractuTing and rending and opening of the rocks of the country. and through these 1t was easy for the water and the chemical gases to percolate. These disintegrated the materials forming the ore, 1t may be, and carried the solution down ward. This could not be indefinitely, so at wafer level fhero fe a TO.