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Collection: Directories and Documents
Mineral Land Classification of Nevada County, California (1990) (235 pages)
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Page: of 235
INTRODUCTION
BACKGROUND
Local, state, and federal agencies are faced with difficult
land-use decisions as competition for land for a variety of
purposes increases. Since the availability of mineral resources
is vital to our society, it is essential that mineral potential
of land be considered in the land-use planning process. The
California Surface Mining and Reclamation Act of 1975 requires
the State Geologist to classify land, without regard to land use,
according the presence or absence of significant mineral
deposits. These studies are carried out under guidelines adopted
by the State Mining and Geology Board (1983). As they are
completed, the State Mining and Geology Board transmits the
mineral land classification reports to appropriate lead agencies
that are required to incorporate the information in their general
plans and to use it in their land-use planning process.
SCOPE
Unlike earlier studies conducted by the Division of Mines
and Geology that emphasized the reporting of mining information
within the state, mineral land classification studies address the
overall mineral potential of land through the identification of
local and regional geologic factors that control or influence the
formation of mineral deposits. Although mines and prospects are
viewed as important sample points for accumulating geologic data
on the nature and distribution of deposits within a mineralized
area, information regarding the extent of workings, years of
activity, total production, current status, etc. is not normally
presented. This type of information may be obtained from the
selected references given for mines and prospects plotted on the
mineral land classification maps (Plates 2-7) and listed in
Appendix A.
FIELDWORK AND RESEARCH
The Mineral Land Classification study of Nevada County was
conducted intermittently over a three-year period between October
1987 and October 1990. Metallic and industrial mineral deposits
were studied during the first two-year period by R.C. Loyd and
construction aggregate deposits were evaluated during the last
year by J.P. Clinkenbeard.
The mineral resource evaluation of Nevada County involved
research of geologic and mining-related literature, compilation
of geologic maps, and plotting of reported mines and prospects
using publications and mine data of the Division of Mines and
Geology, U.S. Geological Survey, U.S. Bureau of Mines and the
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