Calvert prospects (Terry Marie Nos. 1 & 2 prospects; Terry Marie No. 1-3; Nelsons Pride Mine; Nelson's Pride No. 1-4), Baboquivari District, Baboquivari Mts, Pima Co., Arizona, USA
Ref.: Dale, V.B., Stewart, L.A., and McKinney, W.A. (1960), Tungsten deposits of Cochise, Pima, and Santa Cruz Counties., Arizona, U.S. Bureau of Mines Report of Investigation 5650: 76-77.
MRDS database Dep. ID file #10039482, MRDS ID #M050146; and, Dep. ID #10161644, MAS ID #0040190148.
A former small surface and underground group of W mines/prospects located in the N½ sec. 13, T17S, R6E, about 2 miles N of San Juan Spring. Discovered 1953 by Walter N. Calvert (Nelsons Pride Mine), and Eugene D. Calvert (Terry Marie). Produced 1955.
Mineralization is a vein deposit in a shear zone with closely spaced fractures. The rock is dense and compact, leaving little room for tungsten mineralization. Alteration is epidote and manganese oxides occurring on fracture planes. The ore body strikes S70E and dips 80N. The formation is somewhat schistose, feldspathic, and quartzitic rock.
Samples from pits assayed 0.01% WO3, & 0.019% WO3., sample across length of face of open cut assayed 0.037% WO3.
Local rocks strike S30E and dip 80SW.
Workings are comprised of pits, one shaft, one diamond drill hole and one open cut. No production from the Terry Marie.
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Map Reference: 31°57'3"N , 111°41'25"W
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Mineral List:4 entries listed. 3 valid minerals.
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