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Grade and Tonnage Relationships Among Copper Deposits
D.A. Singer, Dennis P. Cox, Lawrence J. Drew
1975, Professional Paper 907-A
Three types of copper deposits-porphyry, strata-bound, and massive sulfide-are described, and the distributions of tonnages and grades for 267 deposits are compared with normal and lognormal frequency distributions. The relationships between grades and tonnages are analyzed by examining the correlation coefficients of these variables. Conclusions reached include the following: (1)...
Thickness of overburden map, Annandale Quadrangle, Virginia
A.J. Froelich
1975, Open-File Report 75-153
Volcanic and sedimentary rocks of late Precambrian age include four formations of volcanic rocks (three newly recognized) and four formations of sedimentary rocks, with a total apparent thickness of more than 60,000 feet. The Siemens Creek Formation, composed of: thin basalt flows, and the overlying Kallander Creek Formation, composed predominantly of...