Pasadena Boy Mine (Pasadena Mine), Tom Reed vein, Oatman, Oatman Mining District, Black Mountains, Mohave County, Arizona, USAi

Regional Level Types
Pasadena Boy Mine (Pasadena Mine)	Claim
Tom Reed vein	Vein
Oatman	Town
Oatman Mining District	Mining District
Black Mountains	Mountain Range
Mohave County	County
Arizona	State
USA	Country

PASADENA MINE.

Location and history. The Pasadena mine (see PI. X) is about 1½ miles west of Gold Road, on open, gently sloping ground that drains northward into Silver Creek, at about 2,550 feet elevation. The mine was located about 1900 and had been working about two years at the time of visit. It is still in the development stage. The property comprises seven mineral claims, five being continuous along the vein and two being side claims. It is owned by the Pasadena Consolidated Mines Company, with headquarters at Pasadena, Cal.

Developments. The mine is developed mainly on the Rhine Gold claim, principally by a shaft 318 feet deep, three levels containing about 100 feet of drifts and crosscuts, and by surface openings. A small shaft 55 feet deep is located 820 feet south of the main shaft.

The principal equipments are a gasoline hoist and a 2-stamp prospecting mill for testing the ore bodies in development work. The water supply is piped by gravity from Cottonwood Springs, 3 miles to the northeast, at Battle Mountain.

Geology. The country rock is the green chloritic andesite, which here, particularly in the side of the gulch to the west of the mine and in the dump, is shown to vary in a very short distance, even in a hand specimen, from the soft, altered greenish chloritic phase to the fresh, hard black rock. A fuller description of the rock appears on pages 34-37. The rock shows characteristic propylitic alteration along the vein. Angular blocks of the rock a foot in diameter and many smaller fragments are inclosed in the vein.

The rock is intruded by dikes and masses of rhyolite and by dikes of a basic but quartz-bearing greenstone porphyry. One of these dikes, of greenish color, 20 feet in width, and trending east and west, is cut by the vein about 3,000 feet south of the hoist. The dike is here prominently cross sheeted parallel with the vein.

Veins and ore. The Pasadena vein or lode varies from 10 to 140 feet in width. It strikes about N. 10° W. and dips about 70° W. It is reported to extend throughout the length of 19 claims and to be continuous with the vein of the Tom Reed or Blue Ridge mine on the southeast; if this is correct it has a length of several miles.

To the north the vein does not seem to retain its development more than a few hundred yards beyond the mine and hoist. To the northwest, however, where the gulch from the south enters Pasadena Wash, a vein of calcite 2½ feet wide and striking northward is prospected, but is not proved to be a part of the Pasadena vein, which it may, however, join farther north.

The croppings consist essentially of reefs of iron and manganese stained quartz and some gray calcite. They show polished faces with horizontal striation. In the Pasadena mine the walls are reported to be firm, well defined, and regular and to stand well.

The vein consists essentially of calcite and quartz, the quartz increasing in amount with depth. Some of it is of the greenish Gold Road type and this carries the best values. The calcite or spar portion of the ore is said to contain its best gold values in the minute black specks and dendritic bodies of iron and manganese, which it carries widely disseminated.

The average values of the ore are reported to be about $10.50 a ton and the ore is said to be suitable for the cyanide process. In the main shaft, which is on the west spur of the vein, the ore is said to average $11.20 in gold to the ton from the surface down, the ore shoot varying from 4 to 10 feet in width. At a smaller shaft 55 feet deep mill runs of ore are reported to have given results as follows: Surface, $5.56; at depth of 25 feet, $12.45; and at 55 feet, $24 in gold to the ton. The ore at these depths is reported to extend the entire width of the shaft, with only one wall in sight.