Page 212 - The Geology and Ore Deposits of Sierra County, New Mexico - Bulletin 10

208 GEOLOGY AND ORE DEPOSITS OF SIERRA CO., N. M.
feet, and is in the Bliss sandstone. The vein followed by the tunnel trends eastward and dips 80° S. The vein is sharply de- fined on the hanging-wall side, but fades gradually into the footwall. The ore, which is partly oxidized, forms pockets and small bodies in both the hanging-wall and the footwall. The gangue consists of quartz, which is more abundant in the lower part of the vein, and clay gangue. Higher in the vein, calcite and fluorite are present. The ore is said to assay 3 to 11 per cent in copper, and it is reported that past production has had a value of about $100,000.
The Oohoo vein is developed by an incline about 400 feet long, which is now partly inaccessible. The elevation at the portal is about 5,300 feet, and the incline was driven in limestone following the dip of the beds, which is about 25° E. The deposit is in an east-west fissure, but the walls are irregular and some replacement of the wall rock has taken place. The limestone near the tunnel is hard and silicified. It is said that the tunnel has produced considerable oxidized copper ore in the past, and for this locality the gold and silver content of the ore is said to be higher than the average, ranging between $3 and $4 to the ton for the combined metals.
LONE TREE PROSPECT
This property was not visited by the writer. It is south of the Marion at an elevation of about 5,000 feet, and the deposit is reported to be much like the one at the Marion tunnel. Near the tunnel the granite and quartz are cut by a pale brownish-gray porphyritic dike. 67
CABALLOS MOUNTAIN MINING & LEACHING CO. PROPERTY
This company is reported to own 14 claims 4 miles in an air line northeast of Arrey. The deposits are fissure veins in the basal sediments above the granite contact. The ore is similar in its occurrence to the deposits already described, except in its range of minerals, which here include galena and its oxidation products in addition to the usual copper minerals. Silver is re- ported in considerable amounts as a constituent of the ore. There are several shallow shafts on the property, the deepest of which is said to be 300 feet, and three tunnels with a combined footage of about 400 feet. The vein on which development work has been done attains a width of 4 feet between the walls, while the mineralized portion consists of veinleth and small bodies distrib- uted somewhat irregularly throughout. A fair road connects the mine with the nearest railroad connection at Hatch, 20 miles distant.
CABALLOS DEVELOPMENT. AND MINING CO. PROPERTY
This property is in the southern extension of the Caballos mining district, and in what is known as the Pittsburg district.
67 Gordon, C. H., op. cit. (U. S. G. S. Prof. Paper 68), p. 284.