‡Ref.: Anderson, C.A. & S.C. Creasey (1958), Geology and ore deposits of the Jerome area, Yavapai Co., AZ, USGS PP 308: 132-134.
The North orebody, consisting mainly of massive sulfides, is on the lower levels of the United Verde Mine, and to the north of the roots of the main orebody.
A small prong of gabbro separates the two orebodies, but the main mass of gabbro is west of the North orebody.
It comprises a group of interconnected thin lenses of massive sulfide and extends vertically from a short distance above the 3450 level downward to about 150 feet below the 4500 level. On the 3450 level it comprises 4 lenses of massive sulfide, trending westward or west-northwestward and ranging in length from 130 to 35 feet and averaging about 10 feet in width. It is mainly in the Grapevine Gulch formation, at or near the contact with the quartz porphyry.
The mineralogy is similar to that of the main sulfide pipe. Along the west margin fine-grained quartz forms scattered lenses as much as 20 feet in width, concordant with the structure. Pyritic massive sulfide and zinc-bearing massive sulfide occur east of the quartz, and veins of pyrite in the quartz indicate the quartz is older. The massive sulfide is in part non-banded, particularly in the pyritic facies, but is banded where sphalerite is abundant. Quartz-carbonate in veins and nodules, with or without sulfide minerals, are common, particularly on the east side of the mineralized zone.
Workings went to the 3750, 4050 and 4500 levels.
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