REP25820

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Date: 4/25/1991
• Doc Name: 1991 AHR - text & App. A - G
• Annual Report Year: 1991
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

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water year. Therefore, water quality sampling did
not begin until water year 1991. The results of this
sampling will be included in next year's report.
Mine Water Monitoring
Mine water inflows in areas being actively mined
were mapped during water year 1990. Areas of
previous mine inflows were monitored by occasion-
al visits. Exhibit II shows locations of inflows and
estimated amounts of mine inflows. Areas o[
standing water are also shown.
Average flows were estimated for the spring runoff
season and the low-flow time of year (Exhibit II).
InOows into previously mined areas along Sylvester
Gulch and near the main portals continued to be
responsive to the spring runoff season. However,
the duration and amount of inflow were Icss than
in years previous to water year 1990 because of low
precipitation and runoff. Areas along the Sylvester
Gulch Main Minc Fan entries produced measured
flows ranging from 0.25 to 0.5 gpm during low flow
conditions. Spring runof(flows ranged from 3 to 5
gpm. The old Sylvester Gulch area (entries ]4
through 21, main intakes) produced estimated
(lows ranging from 0 gpm during low Ilow condi-
tions to I gpm during spring runoff conditions.
Flows in the main portal area (entries I through 5)
were similar to those oC the 1989 water year.
Estimated flows ranged from 0 to 0.25 gpm during
low flow conditions. Spring runoff conditions
produced flows of 1 to 3 gpm. Entry 1 on the east
side of the main intake from crosscut 1 to crosscut
7 had standing water year-round. Flows in this area
were estimated at 0.0 to 0.5 gpm during low flow
conditions and 2 to 5 gpm during the spring
runoff. Entry 9 on the west side of the southwest
main intakes from portal entry 5 to crosscut 7
produced flows estimated at 0 to 0.25 gpm during
low (low conditions and 0.5 to 1.0 gpm during
spring runoff conditions.
6
Activirirs
New areas mined in 1990 produced minor damp
and wet areas with no associated measurable Vows.
The wet areas consisted of damp and wet roofs in
Panels 1WIN and 2W1N and wet roofs and Moors
in Panel NW15 and the "B" scam development.
Root fractures and nearby sandstone channel
margins are probably the sources of the water.
During 1990, samples of mine discharges were
taken from the MB-1 and MB-2 sediment ponds.
They were tested for pH, electrical conductivity,
total suspended solids, total dissolved solids, and
total iron. Results of the analyses are shown on
Table 5. The quality o[ water sampled was good
and posed no problem for direct discharge to a
stream or other surface feature.
The mine water balance, based on actual and
estimated Mows, is shown in Table 6. The quantity
of water discharged or pumped from the mine was
approximately 35 acre feet. Water unaccounted for
is lost through seepage and evaporation into the
ventilating air. Both of these losses can be large,
depending on conditions.