Weekly journal-miner., 1910-01-19


 main shaft of the Arizona Central Copper company works had reached a depth of 700 feet, and coincident with that development the most note worthy and important determination yet made in the property was in evidence. At that depth the creation of a new and distinct mineralogical condition was accomplished, and what is believed to be the forerunner of one of the greatest copper producing properties in the Black Hills range of mountains is practically in evi- dence At the above depth, the OK idized character of the product dis tinctly and readily gave way to the sulphide. With that change the char acter of the quartz followed with the new conditions, and a heavy per centage of lime came in, indicating with the streaks of sulphides in evi- dence that the object of the develop ment had at last been accomplished, or practically so. Every indication now supports the belief that the per manent water line will be tapped in a short time, and where the develop ment is going on is practically on the roof of that point which has been sought. Taking into consider ation, also, the important matter, that on the opposite side of the range, where the United Verde, the Equator, the Daisy, the Copper Chief, and many other mines are located, the depth, at the present time on the Shylock is relatively the same as in those mines where geological conditions changed, and when per manent sulphide ore bodies were ere ated. The demonstrations along this copper belt has added to the Arizona Central merited consideration, and the development on the Shylock claim substantiates not only the fact thaV it is a continuation of that belt, but also justifes the faith as well as the investment of those behind the pro- ject.
 Supporting the splendid condition of the property at the present time, the aim of the management has been centered to the purpose of reaching depth as rapidly as it was possible to do so. All other work has been secondary, and accordingly but linn ited crosscutting or drifting is shown. As this shaft work progressed toward the objective point, rich bodies of OK idized ores have been cut into, and independent of what is coming in at the bottom of the main shaft, desir- able mineral condition is developed in the upper workings where the OK idized formation is shown.
 In the original workings on this mine, as near the surface as fifty feet, a small tunnel showed the min was favorable. From that point to the 200 foot level, a fine grade of oxidized ore, carrying good values in silver and copper, was developed, and this continued down the shaft to the 300 foot level, where similar values and ore bodies were cut into, with additional values in lead of a high percentage. A croscut at this point of 35 feetto the west gave increased values, while streaks of black oxidized copper also came in of high grade. Another crosscut from the 300 foot level to the west showed ore all the way. When the 800 foot level was reached a drift north and south was run, all in ore. A crosscut to the east of 35 feet, exposed good bodies of oxidized ores, and at this point the first indication of a change in the geological conditions came through streaks of quartz and lime appear ing. It was then decided to concen- trate all efforts to reach depth, and further exploitation of the vein was abandoned. Near the $50 foot point in the shaft, evidences of a change were apparent, and Saturday night, the shaft for over eight feet across was a solid body of mineralized white quartz and lime carrying veins of fine sulphide metal Also, at this point, 700 feet, the formation was tight, which is another favorable con- dition that the zone of secondary enrichment, or the permanent water line, is near. At this point, the greatest depth reached on the prop erty, the oxidized condition has dis appeared entirely, and the last shots showed the streaks of sulphides com ing in more pronounced and uni form manner. When the first sulphide bodies were struck, as compared to