Line Boy Mine, Line property, Duquesne-Washington Camp, Patagonia Mining District, Patagonia Mountains, Santa Cruz County, Arizona, USAi

Regional Level Types
Line Boy Mine	Mine
Line property	Property
Duquesne-Washington Camp	Mining District
Patagonia Mining District	Mining District
Patagonia Mountains	Mountain Range
Santa Cruz County	County
Arizona	State
USA	Country

A former small underground Cu-Ag-Au-Mo-Fe-Li-V mine located on 11 unpatented claims in the SE¼ sec. 22, T24S, R16E, about 3/4 mile SW of the Benton Mine, just north of post 113 of the international boundary, S of Duquesne, on National Forest land. Former owners included Capt. O'Connor (1910); Mr. Don Hamerly; and, Mr. Haverly.

Country rock is the gray quartz monzonite which is intruded by a small stocklike mass of granite porphyry that trends north and is about 300 feet wide. From the mass of granite porphyry near the middle of the claim a 10 foot thick dike extends to the WNW and dips steeply to the north. Much white mica is developed in the quartz monzonite near the contact.

Mineralization is a deposit with an ore zone 1.83 meters wide. A 10 foot dike extends from a granite porphyry mass to the NW and dips steeply to the N. A sheet of specularite 3 feet wide follows the hanging wall side of the dike. Considerable amounts of white mica developed in quartz monzonite near the contact. The metallic minerals pyrite, chalcopyrite, and molybdenite, with a little bornite and films of chalcocite, are particularly abundant along the contact of the two rocks and are concentrated in joint planes and fissures, locally with a little associated quartz in small stringers and veins, and the adjoining quartz monzonite is partly impregnated with them. Along the hanging wall side of the dike occurs a sheet of specularite 3 feet wide. Ore control was the contact of a porphyry dike and quartz monzonite, joint planes and fissures. Ore concentration was precipitation from thermal solutions whose circulation accompanied or followed intrusions. Alteration is silicification and sericitization.

An orebody encountered in 1910 is a 6 foot wide vein carrying 11% to 24% Cu. The ore contains principally chalcopyrite, with 15% to 20% of bornite.

Workings include 3 shafts and 2 tunnels totalling 56.39 meters in length and 24.38 meters in depth. Two of the shafts, each 50 feet deep, being at the top of the hill and the third, 80 feet deep, at the north base of the hill. One tunnel is 65 feet long and follows the north or hanging wall side of the dike, the other tunnel is 120 feet long.

Other Databases

Link to USGS MRDS:	10026975

Other Regions, Features and Areas containing this locality

References