2012-10-05_REVISION - M1977342 ‎(14)‎

• Permit No: M1977342
• IBM Index Class Name: Revision
• Doc Date: 10/5/2012
• Doc Name: Appendix B - SWMP
• From: Climax
• To: DRMS
• Type & Sequence: TR18
• Email Name: PSH
• Media Type: D
• Archive: No

Climax Molybdenum Company HENDERSON MINE & MILL SWMP
Empire & Parshall, CO December, 2011
Page 4-4
Table 4.1, Description of Potential Pollutant Sources
PS # Potential
Pollutant Location Purpose Outfall
Likelihood
of Contact
with Storm
Water
Basis
M-5 Sedimentation and
erosion.
Steep bank at
switchback along road
to process/potable
water tanks.
Portion of access road for Mill
Process Water Storage Tank.
Sheet Flow
(Williams Fork)
Likely Erosion and sedimentation from slope discharges into tree below slope. Slope failure could
intensify erosion potential. Slope of the bank is approximately 1:1.
M-6 Spills from mill water
tanks, and sediment.
Process/Potable Water
Storage Tanks and
associated access road.
Mill Process Water Storage and
access road.
Sheet Flow
(Williams Fork)
Unlikely Any unexpected spills from mill water tanks could drain down access road and discharge outside
of the process water area and intermix with storm water.
M-7 Sedimentation,
erosion, and fuel.
Gravel Pit Source of gravel for mill
maintenance and construction.
Flows back into
gravel pit
Unlikely Erosion and sediment during storm events discharge to ditch along county road. Majority of water
in the ditch is returned to the lower portion of the gravel quarry. Remaining water in the ditch
discharges into an open field. The potential for erosion of significant sediment from the gravel pit
is small because area is covered with washed aggregates resulting from gravel pit operations. The
lower areas of the gravel pit report to existing ponds resulting from gravel mining. These serve as
excellent sediment traps since there is no surface connection to the Williams Fork River, and
topographic separation is more than adequate for high magnitude storm events.
M-8 Mobile Equipment
Shop and surrounding
Mill areas.
Primarily areas north of
the Mill Building.
Outdoor storage of materials and
mobile equipment.
Flows to Process
Water
Unlikely Site topography directs discharges from this area to process water systems. Being that a portion of
the discharge path is undisturbed, this pollutant source is included as a BMP.
O-1 Sediment and erosion. Conveyor & Access
Road
Conveyor used to transport ore
from mine to mill.
OF-M5, OF-M6,
OF-M7, OF-M8,
OF-M11, OF-M12
(Williams Fork)
Probable Erosion and sedimentation during storm event. There are several drainage culverts under the
conveyor that discharge toward the valley below, two of which are associated with discernible flow
channels or discharge points to the Williams Fork.
O-2 Pollutants from stored
equipment and erosion
and sediment.
Rectifier #6 Salvage
Yard
Equipment and material storage. OF-M3, OF-M14
(Williams Fork)
Probable Runoff from major storm event could discharge east towards river, but storage in the yard is
monitored and unacceptable materials are removed.
O-3 Sediment, erosion,
and ore.
PC2/PC3 Transfer
Station
Transfer of ore from PC2 to PC3 OF-M8
(Williams Fork)
Probable Erosion and sedimentation of access roads and collection of ore under belt cleaning area, which
could be entrained in storm water being discharged from the site.
O-4 Sediment, erosion,
and ore.
Portal Lay-down and
Rectifier #5 Yards
Portal Lay-down yard where PC2
daylights. Long-term parts
storage.
OF-M9, OF-M10,
OF-M15, OF-M16
(Williams Fork)
Unlikely Yard is rarely used and relatively flat.
O-5 Sediment, erosion,
and ore.
Upper Access Road Access to Conveyor OF-M4, OF-M17,
OF-M18, OF-M19,
OF-M20, OF-M21
(Williams Fork)
Probable Access road is steep and prone to erosion.