2016-12-01_PERMIT FILE - C1980007A

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 12/1/2016
• Doc Name: delete
• Section_Exhibit Name: Exhibit 71
• Media Type: D
• Archive: Yes

HYDROLOGIC CHARACTERIZATION AND MONITORING PLAN 4
2.1.3 Poison Gulch
Poison Gulch is a small, narrow ephemeral stream that is tributary to Dry Fork (Plate 1). Poison
Gulch has a watershed area of approximately 0.3 square miles. The Poison Gulch drainage is
about 1.1 miles long, extends from an elevation of 8,200 to 7,800 feet amsl, and has an average
gradient of about 7 percent.
MCC began monitoring flows and collecting water quality data in Poison Gulch in the spring of
2005. The water quality data do not indicate any mining related impacts. The water quality data
collected through WY2015 for select parameters are summarized in Table 1.
2.1.4 Lick Creek
Lick Creek is a small ephemeral stream that is tributary to Minnesota Creek and is located to the
south and upstream of Dry Fork (Plate 1). The Lick Creek drainage drains the southern portion
of the SOD area and its watershed encompasses an area of approximately 1.9 square miles. The
Lick Creek drainage is about 2.8 miles long, extends from an elevation of 9,730 to 7,630 feet
amsl, and has an average gradient of about 12 percent. Lick Creek is a steep narrow drainage
with a limited alluvial valley floor. The incised channel restricts the width of the alluvium. The
relatively steep stream gradient and the presence of sandstone outcrops limit the thickness and
presence of alluvium. Lick Creek often has intermittent flows in the upper reaches originating
from several springs, but is typically dry in the lower reaches.
The Lick Creek water quality data collected through WY2015 for select parameters are summarized
in Table 1 and do not indicate any mining related impacts. The water quality data do, however,
reflect natural seasonal variations with respect to levels of iron, manganese, pH, TDS, and TSS
being elevated during spring runoff.
2.1.5 Deep Creek
Deep Creek is a perennial stream that is tributary to Raven Gulch which flows north into the
North Fork of the Gunnison River (Plate 1). The Deep Creek drainage drains the small northeast
arm of the SOD area and the majority of the DFL area and its watershed encompass an area of
over 9.4 square miles. Deep Creek is about 5.4 miles long, extends from an elevation of 8,550
feet to 6,600 feet amsl, and has an average gradient of about 6.8 percent. Deep Creek is a steep
narrow drainage with a limited alluvial valley floor. The incised channel restricts the width of
alluvium. The baseflow in Deep Creek originates from numerous springs. The Deep Creek
Ditch originates at the Little Gunnison River, collects runoff from upper Deep Creek, and
transports flows to upper Dry Fork.
Deep Creek water quality data collected through WY2015 for select parameters are summarized in
Table 1 and do not indicate any mining related impacts. The water quality data do, however, reflect
natural seasonal variations with respect to levels of manganese, pH, and TDS being elevated during
spring runoff.
2.1.6 South Prong Creek
South Prong Creek is an ephemeral stream tributary to Minnesota Creek and is located upstream
of Lick Creek (Plate 1). The north fork of South Prong Creek drains the extreme southeast
corner of the SOD area and is well outside the current mine panel area (-0.5 miles). As a result,
mining related hydrologic impacts activities are not anticipated in the South Prong Creek
drainage area.
Revised 09/07- PR12; 08/16- TR139 HydroGeo, Inc.