New Dominion Mine (New Dominion property; New Dominion group; Stallo deposit), Big Johnnie Gulch, Globe, Globe Hills, Globe Hills District, Globe-Miami District, Gila Co., Arizona, USA

A former surface and underground Cu-Pb-Ag-Au-Mn-V mine and group of 11 claims located in the SW¼ sec. 13, T1N, R15E, on the NW side of Big Johnnie Gulch, about 1.5 miles SW of Black Peak, 2 miles north of Globe and 1 mile north of the Old Dominion "A" shaft, on private land. It includes the Mallory, or IXL, Mine and several small veins. The total property consists of 26 claims (20 patented). Earliest records place these claims in the possession of the Globe-Boston Copper Mining Co. (? -1906). In 1906 the property was acquired by the Globe Consolidated Copper Co. The mine was closed in 1907 and in 1909 the company merged with the Cordova Copper Co. The New Dominion Copper Co. purchased the property in 1916 (1916-1942). In 1942 the claims were acquired by T.J. Long of Globe (1942-1955)(11 claims). In February he sold the claims to C.W. Via (11 claims). Produced 1911-1955. Other owners/operators include A. R. Miller; W. A. Cook; F. Rodriguez; A. Peplica, B. F. Baker; Sidney Gibble, and S. Rodriguez.

Mineralization is probably associated with Early Tertiary, post-diabase intrusion period, although the nearest outcrop of Early Tertiary Schultze Granite is at the Old Dominion Mine, 1 mile S. Copper ore occurs as veins in fault zones; Mn-Pb ore occurs as replacement in limestone. The Mn deposit is 300 feet long, soft thick, strikes N80E, and dips N.

In the early days Mn-Ag ore was produced from several small veins. Later the focus was on 2 copper-bearing veins. Manganese ore was again produced from veins in limestone about 1955.

One of the manganese veins in limestone, whose outcrop passes through the collar of the Mallory shaft, strikes N37E and dips 70NW. It forms the boundary between a thin block of Troy quartzite and a thick diabase sill that crops out in Big Johnnie Gulch and underlies the Troy quartzite on Buffalo Hill to the east. The other vein strikes about N10E, and the outcrops of the two veins join 300 feet SW of the shaft. The second vein follows a fault that brings the Martin and Escabrosa limestones into contact with the thin block of Troy quartzite, and south of the junction of the two veins it forms the boundary between the Escabrosa limestone and the diabase sill. Most of the dispalcement on these faults probably preceded or was contemporaneous with the intrusion of diabase, and the later displacement appears to have been very small.

The faults described above coincide approximately with a northeastward-trending structural zone along which there was an abrupt change in the horizon at which the main diabase sill was intruded. SE of this zone, the sill is between the base of the Troy quartzite and the top of the Apache group; whereas on the NW side, thin remnants of Troy quartzite rest directly on Dripping Spring quartzite; and the main diabse sill was intruded at or near the base of the Pioneer formation.

The sedimentary strata north of this zone form a large block that is bounded on the north by the Irene vein fault and on the SE by a northeast-striking fault that is commonly referred to as the New Dominion vein. Both faults had large displacements before the intrusion of diabase, but probably less than 50 feet of diaplacement afterwards. The western part of the block is overlapped by dacite.

The fault that forms the SE boundary of the block splits about 1,700 feet NE of the Mallory shaft, and a narrow wedge of Martin and Escabrosa limestones between the two branches has been relatively depressed. Both branches of the fault are mineralized, and several small oreshoots have been mined along the outcrops. Other small, generally discontinuous, veins occur along fractures and minor faults that traverse the martin limestone in the southern part of the block. The Martin in this area is thin and lacks the conglomeritic and arenaceous memberss that are characteristic of the lower part of the formation in most places. It was deposited on an irregular erosion surface that stood relatively high underlain by Dripping Spring quartzite and thin remnants of Troy quartzite.

The ore minerals in these veins are entirely different from those in the veins developed by the Mallory Mine. The richer portions of the veins, which appear to have been small lenticular shoots, have been largely mined out. Veins still visible are a few inches to a foot wide, but some stoped portions may have been 3 feet (90 cm) wide. They have been highly altered by supergene oxidation and leaching.

Most of the central part of the veins is quartz containing many drusy vugs and cavities formed by solution of the hypogene vein minerals. This partb graqdes outward into partly replaced limestone breccia cemented by calcite and by manganese oxides, mainly pyrolusite and psilomelane-like minerals, a network of veinlets and irregular replacement masses of manganese oxides intergrown with calcite and chalcedony extend outward into the limestone walls for a smuch as 10 feet. Spongy masses of quartz are crusted by hemimorphite, descloizite, and globules of vanadinite generally intergrown with white calcite. Finely granular cerussite is disseminated throughout the oxidized vein matter.

Copper minerals are extremely rare. The veins are completely oxidized to the depths reach by mine workings, and probably down to the permanent water table. Sulfides exist below 800 foot level only.

Workings include a main shaft, which is the Mallory or IXL, 1200 feet deep with levels at 125 feet, 200 feet, 460 feet, 800 feet, 1000 feet, and 1200 feet, covering two main copper veins. The Mn deposit was worked by open cuts and a 75 foot deep inclined shaft. Production for 1934 through 1937 is from the Shaffer and Mills College groups.

References:
Ransome, F.L. (1903) Geology of the Globe Copper District, Arizona, USGS PP 12: 155.

Neale, W.G., The Mines Handbook, Vol. XVII (1926): 329-330.

Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990: 52.

Peterson, Nels P. (1962) Geology and Ore Deposits of the Globe Miami District, USGS PP 342: 116-118.

Peterson, N.P. (1962), Geology and ore deposits of the Globe-Miami District, Arizona, USGS PP 342: 116-118.

U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.

MRDS database Dep. ID #10109786, MRDS ID #M241226; and Dep. ID #10136730, MAS ID #0040070047.