Page 162 - The Geology and Ore Deposits of Sierra County, New Mexico - Bulletin 10

16O GEOLOGY AND ORE DEPOSITS OF SIERRA CO., N. M.
Animas Peak. The workings consists of a tunnel, which cross- cuts for 150 feet to a fractured zone in the andesite having a strike of N. 60" E. and dip of 50" NW., and then follows along this zone for a distance of 200 feet. The width of the fractured zone is 2 to 4 feet, and the width of a persistent seam of gouge on the hanging wall side is from 1 to 18 inches. Three shoots of ore were encountered in the gouge along the tunnel in a dis- tance of 200 feet, one of these being 20 feet long and the others each 30 feet long. The value of the gouge seam is said to vary from $2.50 to $52 per ton. A moderate amount of material has been shipped from the three high-grade shoots in the vein. The gangue is calcite and subordinate quartz, and the vein at this elevation is highly altered and oxidized.
REPUBLIC AND WISCONSIN CLAIMS
The Republic and Wisconsin claims are on the north slope of Animas Peak and in Dutch Gulch just south of the road lead- ing to the El Oro property. There is a tunnel on the Republic claim 100 feet long, following a vein which strikes N. 78° E. and dips 65° NW. Latite porphyry makes the hanging wall and andesite breccia the footwall. The vein is 3 to 4 feet wide, and the value for the full width is reported to be from $4 to $5. Stringers of quartz and limonite in a gouge seam within the vein have assayed $16 per ton. These stringers have a width of 6 inches or less.
On the Wisconsin claim a shaft 90 feet deep exposes a vein 4 feet wide, with an 18-inch seam of gouge in the center. The footwall of the vein is latite porphyry and the hanging wall is andesite breccia. Assays from the shaft are said to average about $4 per ton. The vein consists of seams of quartz which are principally within the gouge seam. The vein outcrop has a jaspery appearance, and some of the jasper is said to yield high assays. In places at the surface the copper silicate, chrysocolla, has been found. This vein is considered to be an extension of one of the veins of the El Oro property. At the west end of the Wisconsin claim a fault offsets the vein 50 feet or more. A small pit at this point yielded a few tons of ore, the hand-sorted prod- uct from which assayed $20. These claims, formerly owned by Slease and Hiltscher of Hillsboro, have recently been acquired by the El Oro Mines CO.
PROPERTY OF EL ORO MINES CO.
The property of the El Oro Mines Co. is in the northeastern
part of the Hillsboro (Las Animas) Mining district. It includes the northern end of Copper Flat, and from there it extends in a northeasterly direction along Dutch Gulch and along the hills on either side of this Gulch to the andesite-limestone contact in the north part of the district. The Republic and Wisconsin claims have recently been acquired by this company, and it is said that the Mary Richmond mine in the southwestern part of