Gold Butte Mining District

Gold Butte Mining District

The Gold Butte district is in southeastern Clark County in the southern end of the Virgin Range. It includes the territory south of Gold Butte lying between the Nevada-Arizona boundary line on the east and the Virgin River on the west. Mining was begun in this area in the eighties. A small boom occurred in 1908, when the camp of Gold Butte was established, and although a number of small companies were organized to work various properties, no important discoveries were made. The total production from the district has been about $75,000, mostly in shipping ores. In 1936 the principal operation in the district was that of the Lake Shore Mining Co.

The geology of the Gold Butte mining district has been described by Hill (Hill, James M., Notes on Some mining District in Eastern Nevada: U.S Geol Survey Bull. 648, 1916, pp 42-53)

The ore deposits are of two types – replacement deposits in limestone and quartz veins in gneiss and granite. The ore in the limestone consists of oxidized copper, lead, and zinc minerals. The values in the quartz veins are chiefly in gold.

A small amount of sheet mice has been produced from pegmatite dikes in the vicinity of Gold Butte.

Mica Deposits

In 1873 Daniel Bonelli discovered mica deposits 4 miles east of Gold Butte, but because of their isolation and unfavorable transportation facilities very little mining was done. As far as the writer could learn, the only production has been 5 tons of sheet mica shipped by Bonelli prior to 1900 and 2,500 pounds shipped by Frank Allsop in 1908. In recent years these deposits have not been exploited. William Garret of Gold Butte is the owner of several unpatented mica claims in this area.

The deposits have been prospected by a number of shallow shafts, the deepest of which is about 40 feet. The mice, associated with garnet, quartz, feldspar, and tourmaline, occurs in pegmatite dikes that cut granitic schists. Due to the manner in which the mica occurs, it is difficult to mine it in large sheets. The mice is said to be of good quality as to transparency, color, cleavage, and flexibility, and the size of the sheets varies from 6 to 15 square inches.

Magnesite Deposit

Magnesite occurs in the vicinity of Horse Springs, 14 miles by road southeast of St. Thomas, Nev and 9 miles north of Gold Butte. The deposit was located originally by Fay Perkins of Overton, Nev in 1922. The present owner is Albert Bauer. No production has ever been made. Development comprises several short tunnels and a shaft about 60 feet deep. Fine-grained dolomite and magnesite beds overlain by shale and underlain by limestone and dipping about 30 degrees outcrop for several thousand feet

Webster Group

A group of sever unpatented claims in Cedar basin is owned by Mrs. A. G. Webster of Moapa, Nv. In 1937 this property was under option to H. G. Snyder of Salt lake City, Utah. Development comprises a shaft 130 feet deep and several hundred feet of lateral workings. Property is equipped with a 2-stamp mill (1,050 pounds each),a jaw crusher (6 by 8 inches), and an amalgamation plate (4 feet long and 3 feet wide). Mill equipment is operated by an automobile engine. About 150 tons of ore, averaging 1 ounce of gold per ton, was treated in this mill.

The ore occurs in a quartz vein in the granite. The dip of the vein is about 75 degrees and the average width is 18 inches. Formation is altered granite and schist traversed by pegmatite dikes.

Azure Ridge Group

The Azure Ridge Group of four unpatented lode claims owned by John F. Perkins of Overton, Nv is near the Arizona-Nevada boundary in the southeastern part of the Gold Butte district. The only production from the property was in 1918, when John F. Perkins shipped two carloads of zinc ore and one carload of copper ore. The zinc ore averaged 40 percent zinc and the copper ore 35 percent copper, with small values in gold and silver. This ore was hand-sorted and hauled to St. Thomas for shipment to smelters. Since 1918 the property has been inactive.

This property is in the prospect stage of development and all work has been superficial in character. Development comprises an adit 100 feet long, another of 40 feet, and several shallow shafts, totaling in all about 300 feet of workings. Mineralization occurs in a faulted zone in limestone near granite.

http://www.nbmg.unr.edu/mdfiles/mdfiles.htm

The Bonelli Deposit

The Bonelli Deposit – the Bonelli salt deposit is in the NW1/4 of Sec 4, T. 20 R. 68E and near the east bank of the Virgin River.

The salt exposure is confined to the western extremity of a minor spur where it appears as the crest of a small, sharp, anticlinal fold of which the axis strikes about 50 degrees east. The salt mass, as seen in section in the open cut shown in the illustration, is about 20 feet high and 40 feet wide. It is directly overlain by about 70 feet of brown silt containing lenses of very impure gypsum. Overlying this brown silt is about 10 feet of impure gypsum which forms the summit of the spur. In a small ravine immediately north of the salt deposit, crystalline rocks, presumably of pre-Cambrian age, are exposed. The salt-bearing beds were either deposited against a steep slope of these rocks or have been faulted down against them. 

In either vase the salt bed is definitely limited in that direction. To the east and south the salt mass dips steeply under the overlying silts of the Muddy Creek formation. On the west, the salt bed has been cut away by the Virgin River. Some of the higher hills north of the deposit are capped with basalt indicating that the salt probably lies in the same general stratigraphic zone as the other deposits, namely, a few hundred feet below the basalt flow of the former lacustrine period.

A tunnel, shown in figure 105, to the right of the open cut, has been driven into the fill for about 100 feet, penetrating brown silt. Between the tunnel and the open pit there is exposed a little very impure salt, apparently the result of the impregnation of the silt by salt carried in solution from the main salt mass. It is reported that some salt was secured from this deposit about 1895 to 1900, but apparently no mining has been done since that time.