Draft Environmental Impact Statement for Roca Honda Mine

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Chapter 3. Affected Environment and Environmental Consequences Table 11. Estimated storm water runoff for developed and undeveloped conditions Subbasin Area (acres) Discharge (cfs) Volume (ac-ft) Developed Discharge per Acre Undeveloped Discharge per Acre 101 10.8 42 1.46 3.89 3.89 102 18.9 64 2.55 3.39 3.39 103 21.9 79 2.96 3.61 3.61 104 35.4 98 4.77 2.77 2.77 105 31.6 102 3.68 3.23 3.23 106 1 626.5 595 66.64 0.95 0.92 107 1 499.8 814 60.6 1.63 1.55 108 82.8 185 9.65 2.23 2.23 109 1 54.1 204 6.58 3.77 2.78 110 1 224.2 457 26.88 2.04 1.81 111 1 23.3 88 2.83 3.78 3.67 112 5.5 20 0.65 3.64 3.64 113 42.9 112 4.54 2.61 2.61 114 58.8 159 5.92 2.70 2.70 115 15.8 39 1.27 2.47 2.47 116 13.0 52 1.67 4.0 4.0 117 15.9 58 1.86 3.65 3.65 118 20.1 77 2.45 3.83 3.83 119 75.6 219 8.82 2.90 2.90 120 88.5 206 10.32 2.33 2.33 121 140.3 366 16.36 2.61 2.61 122 1 154.2 527 19.41 3.42 1.27 123 474.5 620 55.32 1.31 1.31 124 9.2 34 1.07 3.60 3.60 125 244.5 423 28.51 1.73 1.73 Source: Attachment 2, MOP Rev 1; 1 Sum of values for subbasin number from RHR Mine Operations Plan Revision Attachment 2, Jan 2011 In addition to storm water impacts on disturbed land, the installation of dewatering wells, ventilation holes, and escape shafts would be accomplished with drilling rigs or boring machines. Pits to hold drilling mud for recirculation are anticipated to be excavated. Drilling mud pits can be of concern to surface water quality, in the event of overtopping or flooding. Construction, operation, and restoration of the mud pits are expected to be in compliance with the Pit Rule (19.15.17 NMAC). 152 DEIS for Roca Honda Mine, Cibola National Forest
Table 12. Storm water controls for stockpiles Stockpile Material Slope Runoff Controls Topdressing 4:1 Diversion ditch around piles ending in sediment trap with rock filter Subsoil 3:1 Diversion ditch around piles ending in sediment trap with rock filter Subbase Rock 3:1 Diversion ditch around piles ending in sediment trap with rock filter Shaft Excavation Material Nonore Material 3:1 Diversion ditch around piles ending in sediment trap with rock filter 3:1 Diversion ditch around piles ending in sediment trap with rock filter Ore Material – Staged on pads in ore bays with sloped concrete floors draining to retention ponds Operational Phase Effects Chapter 3. Affected Environment and Environmental Consequences Sediment Release Controls Filter rolls below stockpile; soil cover, revegetation Filter rolls below stockpile Filter rolls below stockpile; stabilized with spray Filter rolls below stockpile; stabilized with spray Filter rolls below stockpile; stabilized with spray Sump collects solids before water enters retention pond Storm Water Discharge Area Nearest arroyo Nearest arroyo Nearest arroyo Nearest arroyo Lined evaporation pond Lined retention pond Mine operations surface facilities were designed and located to avoid disturbance to minimize potential effects to surface hydrologic resources and the hydrologic balance through minimizing alteration of arroyos, springs, and stock ponds, as described in the mine operations plan revision 1. The direct and indirect effects on surface water associated with operation of the RHR project are discussed in the following paragraphs. Effects on Surface Runoff During mine operations, surface facilities of the mine site can impact storm water as summarized in table 13. Table 13. Potential sources of storm water contamination Drainage Area Source of Contamination Contaminants Cleared and graded areas, material stockpile areas Storm water erosion of disturbed soils and material stockpile areas Operations areas Storm water erosion of disturbed soils; leaking equipment and support vehicles; spills during fueling; and maintenance of equipment and vehicles Site entrances and exits and access roads Leaking vehicles; spills during fueling or maintenance; tacking of soil to and from work areas Soil, sediment Soil, sediment, hydraulic fluid, oil, gasoline, diesel from heavy equipment Soil, sediment, gasoline, diesel, oil, hydraulic fluid DEIS for Roca Honda Mine, Cibola National Forest 153
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United States Department of Agricul
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Environmental Impact Statement for
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Summary Roca Honda Resources, LLC (
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• Potential effects on the charac
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Mine Operation Summary Mine operati
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Resource Impacts and Mitigation •
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Resource Impacts and Mitigation num
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Contents Chapter 1. Purpose of and
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Contents Table 29. State of New Mex
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Contents Table 94. Food stamp enrol
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Contents Figure 66. Aerial image of
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H1N1 Influenza A virus, subtype H1N
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STD sexually transmitted disease SW
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Chapter 1. Purpose of and Need for
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Chapter 2. Alternatives, Including
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Land Use Chapter 2. Alternatives, I
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Treated Water Discharge in an Alter
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Table 3. Impact comparison matrix T
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Topic Alternative 1 - No Action Res
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Vegetation Topic Alternative 1 - No
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Topic Alternative 1 - No Action Sen
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Topic Alternative 1 - No Action Rec
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Topic Alternative 1 - No Action Cul
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Transportation Topic Alternative 1
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Topic Alternative 1 - No Action Hum
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Topic Alternative 1 - No Action Alt
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Topic Alternative 1 - No Action Leg
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Other Actions and Projects Consider
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Marquez Canyon Exploration Current
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Chapter 3. Affected Environment and
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State Listed Plant Species Chapter
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Species Status Habitat and Distribu
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Common Name (Scientific name) Black
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Common Name (Scientific Name) Gunni
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Table 39. Criteria for rating impac
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Wildlife Mortality Chapter 3. Affec
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Table 40. Impact characterization f
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Transportation Chapter 3. Affected
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Figure 57. Nearby recreation sites
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Table 41. Impact characterization f
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Minority Populations Chapter 3. Aff
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Figure 58. Distribution of minority
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High school graduates, percent of p
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Earnings Chapter 3. Affected Enviro
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Public Finance Chapter 3. Affected
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providing an estimate of the “rip
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Tax Revenue Chapter 3. Affected Env
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Table 61. Household characteristics
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Tribal History Chapter 3. Affected
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Natural Resources Chapter 3. Affect
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Physical APE Chapter 3. Affected En
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Agricultural Fields Chapter 3. Affe
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• Removal of a property from its
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Impacts to Natural Resources with C
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Site No. Project Section Land Statu
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Visual Resources Affected Environme
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Figure 64. View looking north from
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Alternative 1 Chapter 3. Affected E
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Environmental Consequences Chapter
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New Mexico 1.11 (0.98 - 1.25) Cibol
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Magnitude Descriptor Precedence or
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Noise Chapter 3. Affected Environme
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Resource Area Cultural and Historic
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Cumulative Effects Chapter 3. Affec
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Chapter 4. Consultation and Coordin
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Chapter 4. Consultation and Coordin
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Glossary Air-Quality Control Region
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References Cited (ACHP, 2005). Advi
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References Cited (Basin Coordinated
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References Cited (Brugge et al., 20
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References Cited (Census, 2011). U.
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References Cited (DesertUSA, 2011).
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References Cited (Gordon, 1961). Go
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References Cited (Jackson, 2002). J
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References Cited (Lyford et al., 19
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(NatureServe, 2010a). NatureSevere.
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References Cited (NMDH, 2010c) New
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References Cited (NRGNHA, 2011). No
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References Cited (RHR, 2011a). Roca
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References Cited (Stacier and Guzy,
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References Cited (USEPA, 1975). U.S
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References Cited (USFS, 2001). U.S.
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References Cited (USFWS, no date).
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References Cited (WildEarth Guardia
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Index E economic impacts - 15, 73,
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Index N National Environmental Poli
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Index W waste - 18, 40, 46, 56-57,
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Draft Environmental Impact Statement for Roca Honda Mine

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