Dames & Moore, 1999 - USDA Forest Service

TABLE 4.24
BORROW SOURCE EVALUATION
HOLDEN MINE RUFS
DAMES 8 MOORE JOB NO. 17693005-019
SourceRocation
Rock Quarry, approximately
1500 R north of road at milepost
2.5
Holden Road at 3-Mile, on north
side of road
Holden Road at 4-Mile, adjacent
to and upslope of north side of
road
Holden Road at 6.5-Mile.
adjacent to and upslope of north
side of road
Talus Pile at 9-Mile.
approximately 500 ft north of
road
H:Violden\DraR Final RI rptS-4bblesW-2-6.xIs
71 1 8/99
Potential Use
rip-rap
rip-rap
rip-rap
rip-rap
riprap
Approximate
Distance
9 miles
8 miles
7 miles
4.5 miles
1.5 miles
Description (composition, size, etc.)
granodioritediorite-monzonite assemblage:
weathered in part; fractured -fracture density
variable but relatively high with several
conjugate sets
Page 1 of 2
SchmidtHammer Tests
on fresh exposures: red-brown
monzonite - < 30%; gray white diorite
- 20-45 %; white granodiorite > 50 %;
hard contact zones 5565 %
glacially eroded (smoothed, fluted) fractured on weathered surfaces: qua& diorite
bedrock composed primarily of quartz diorite to 35-45%; granodiorite - 30-50% with a
granodiorite
few > 50%
glacially eroded (smoothed, fluted) densely
fractured bedrock composed primarily of quartz
diorite to granodiorite, and monzonite
many 5 to 10 R (and >) erratics mixed with
smaller talus/collwium and glacially eroded
bedrock exposures; primarily granodiorite
diorite
many large variety of liihologies: finegrained
volanics (latites, rhyodacites), mafic
hypabyssal suites, coarse granodiorites;
not performed
on weathered surfaces: primarily
granodioritic erratics on slope -
consistently between 50-58%, with
some 40%. and a few >60%
hypabrssal and volcanics - 60-70%'
coarse granodiorites - 45-55%
Feasibility
medium to low quality; would need hygrading;
relatively long haul distance; appears
sufficient
apparent medium to low quality; would need
hygrading and further assessment; relatively
long haul distance; quantity unknown; quarry
development may be pose difficulties with
Holden Road road use
apparent low quality; would need hygrading and
further assessment; relatively long haul
distance but close to road; quantity unknown
apparent medium quality; would need
hygrading and further assessment; relatively
moderate haul distance but close to road;
quantity unknown
apparent high to medium quality; would need
hygrading and further assessment: relatively
short haul distance; quantity appears sufficient;
quarry development may pose technicausafety
challenges