Bisbee daily review., 1919-07-27
PROBLEMS IN THE GIGANTIC TASK
 IF LEVELUNG SACRAMENTO HILL

In the summer of 1917 the work of cutting down Sacramento Hill in or der to take out the ore lying beneath it was begun. By its removal land mark will be lost, but many million pounds of copper will be added to the worlds supply and the Warren dis trict will be the gainer by increased activity in it's one great industry, and years added to its life. V
 The deposit is one requiring heavy preliminary investment. It is prob able that before the ore is reached, a concentration mill erected and neces- sary additions made to the smelting plant, five or six million dollars will be spent, and until then little or no copper can be sold.
 Both ore bodies comprising the known ore in Sacramento Hill were encountered in 1910 by underground workings projected to explore the most favorable areas in the porphyry intrusion. They have developed into very large and important deposits since then but no others have been found For a time exploration was by means of underground work, but in 1912 churn drilling began. Some of the richer ore was mined and shipped to the shelter, but when ex- ploration proved its importance all underground work was stopped and production was limited to what was required for test purposes in the ex- perimental mill and a small quantity of silicious ore needed by the shelter.
 The west orebody is now thorough ly explored but further drilling may be expected to prove extensions to the east Orebody.
 The ore in Sacramento Hill is of a variety new to the Warren district, where almost every other ore of cop per occurs in important quantities. It is q disseminated ore lying in the circular intrusion of porphyry which was pushed up through the Dividend Fault between the roundatiOn and Pinal sohist on the north and the Iimestones on the south. The ore appears to be confined to the brec- ciated zone in that side of the DOT phyry adjacent to the iimestOnes. IL occurs in two bodies separated by barren. or at least unprofitable, ground.
 The west orebody, it is figured, contains about 7,660,000 tons of ore carrying 22 per cent copper. Its eastern part lies under the peak of the hill 300 feet below the summit. If extends downward 400 feet farther.
 The east orebody which has devel- oped about 14.OOO,OO0 tons of con centrating ore. is somewhat better adapted tO underground mining but il is also more favorable for open pit work The method of working it will not be decided upon until more in- formation is available on the results of steam shovel work in the west ore body.
 Tho hill reaching up 300 feet above the 536G level, will be taken down in four benches, three of 60 feet each and one at the top averaging about that height but having a maximum of 120 feet.
 The benches will all be opened from the south. working back toward the north rim of the pit. The ground is thus broken into the pit and away from the slope toward Naco Road and the railway They must be attached separately, beginning on the top bench. and the upper benches must he kept we'll in advance of the lower so that they may not be undermined
 In order to reach the top bench track was laid on a grade cut out Of the bill itself. lt takes two and three quarter miles of track, most of it on 21b per cent grade with heavy curves two switchbacks, and circuit of the hill. to climb to the top.