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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
of the county, depletion dates can be calculated for each region.
These depletion dates can then be released without revealing
proprietary data, although the factors used to derive them
cannot.
The construction aggregate reserves of western Nevada County
will be depleted in 14 years, sometime in the year 2004. This
number does not account for any potential replenishment of
aggregate at currently permitted instream mine sites (R. J. Miles
Company and Hansen Brothers Enterprises, Inc.). Eastern Nevada
County's construction aggregate reserves will be depleted in 31
years, sometime in the year 2021. This marked difference in life
expectancy of reserves is because of the larger initial
population and smaller reserve base in the western portion of the
county.
The expected longevity of aggregate reserves is based upon
the assumption that the mining of these reserves will continue to
be permitted until the reserves are depleted. In a predominantly
rural county such as Nevada County, large public works projects
such as new dams, new highways or the widening of existing
highways could significantly affect the longevity of the
aggregate reserves of the county. Figure 6 illustrates that
considerable annual variations in aggregate production rate have
occurred in Nevada County in the past, probably due, at least in
part, to these causes. Should unforeseen events occur, such as
massive urban renewal, reconstruction in the wake of a disaster,
or a major economic recession, the demand for construction
aggregate in Nevada County could change considerably, which could
alter the life span of aggregate reserves in the county.
To increase the reserve base significantly, the permitting
of new mines should be given serious consideration by aggregate
producers, local planners and decision-makers. Planning for new
mine sites can minimize incompatible adjacent land uses and
environmental impacts can be more easily mitigated. To quantify
the possibility of construction aggregate replenishment at
currently permitted instream mine sites, the county may wish to
conduct site-specific studies on Greenhorn Creek and on the Bear
River.
AGGREGATE RESOURCES IN NEVADA COUNTY
As stated previously, resources include reserves as well as
all potentially usable aggregate materials that may be mined in
the future, but for which no permit allowing mining has been
granted, or for which marketability has not been established.
Aggregate resources in Nevada County have not been precisely
quantified. However, an approximate minimum tonnage of resources
can be calculated using Table 3 and a threshold tonnage of 1.94
78