Hydrologic Investigation Summary

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Presentation transcript:

Hydrologic Investigation Summary Prepared at the Request of Nevada Division of Environmental Protection - Bureau of Mining Regulation & Reclamation February 2009 Errol L. Montgomery & Associates, Inc.

Site Location Errol L. Montgomery & Associates, Inc.

Errol L. Montgomery & Associates, Inc.

ANNUAL PRECIPITATION Errol L. Montgomery & Associates, Inc.

MONTHLY PRECIPITATION Errol L. Montgomery & Associates, Inc.

Geologic Map Errol L. Montgomery & Associates, Inc.

Site History Mercury mining 1915 to 1940s Inactive from 1940s to 1960s Exploration by numerous companies for gold and other commodities 1960s to 1980s Open pit / heap leach mining by Touchstone Resources and Galactic Resources joint venture 1990 to 1992 Errol L. Montgomery & Associates, Inc.

Site History (cont.) Operation of heap leach and exploration by Newmont 1992 to 1995 Closure / reclamation by Newmont 1996 to 1998 (Water Pollution Control Permit NEV88022) Errol L. Montgomery & Associates, Inc.

Site History (cont.) Exploration by Great Basin Gold 1997 to 2002 Underground exploration by Hecla Ventures 2002 to 2007 (Water Pollution Control Permits NEV2003107 & NEV2003114) Ongoing underground exploration by Great Basin Gold / Rodeo Creek Gold 2007 to present (Water Pollution Control Permits NEV2003107 & NEV2003114) Errol L. Montgomery & Associates, Inc.

Monitoring Network Touchstone/Galactic wells early 1990s (WW-1 and WW-5) Newmont wells 1998 and 2000 (HOL-MW1, P1 and P2) Hecla Ventures wells 2002 and 2004-2005 (BH-series, W-E-1, and DGW-1R) Rodeo Creek Gold wells 2006 and 2007 (red) and surface water monitoring sites (green) Errol L. Montgomery & Associates, Inc.

Monitoring Program Quarterly Groundwater Levels 14 monitor wells 1 water supply well 7 piezometers West Pit pond Quarterly Groundwater Quality Samples 13 monitor wells 2 water supply wells 2 piezometers 7 stream sampling locations Errol L. Montgomery & Associates, Inc.

Occurrence of Groundwater Groundwater occurs in two fractured rock aquifers Tertiary volcanic rocks Ordovician sedimentary rocks Errol L. Montgomery & Associates, Inc.

Volcanic Rock Aquifer Groundwater in the Tertiary volcanic rocks is recharged locally by precipitation Groundwater level in the Tertiary volcanic rocks follows local topography Groundwater movement in the Tertiary volcanic rocks is from the north-northwest toward the south-southeast Errol L. Montgomery & Associates, Inc.

Sedimentary Rock Aquifer Groundwater in the Ordovician sedimentary rocks is recharged in the mountains to the northeast Groundwater movement in the Ordovician sedimentary rocks is from the northeast toward the southwest Errol L. Montgomery & Associates, Inc.

Location Map Errol L. Montgomery & Associates, Inc.

BH-07 Errol L. Montgomery & Associates, Inc.

BH-01 Errol L. Montgomery & Associates, Inc.

Location Map Errol L. Montgomery & Associates, Inc.

Errol L. Montgomery & Associates, Inc.

Location Map Errol L. Montgomery & Associates, Inc.

Water Level Comparison Errol L. Montgomery & Associates, Inc.

April 2008 Groundwater Contours Errol L. Montgomery & Associates, Inc.

Groundwater Quality Up-gradient groundwater quality--background levels Tertiary volcanic aquifer and Ordovician sedimentary aquifer Pit area water quality--impacted by historic mining operations Down-gradient water quality--slightly impacted by historic mining operations Errol L. Montgomery & Associates, Inc.

Stiff Diagram Well Identifier pH Date Sampled Total Dissolved Solids Na + K Ca Mg Cl HCO3 SO4 Date Sampled Total Dissolved Solids milligrams per liter Errol L. Montgomery & Associates, Inc.

Groundwater Quality Up-gradient from Historic Mining Operations Tertiary volcanics Ordovician sediments Errol L. Montgomery & Associates, Inc.

Groundwater Quality Vicinity of Historic Mining Operations *Pit area well Errol L. Montgomery & Associates, Inc.

Groundwater Quality Down-gradient from Historic Mining Operations Tertiary volcanics Ordovician sediments Down-gradient well Errol L. Montgomery & Associates, Inc.

Location Map Errol L. Montgomery & Associates, Inc.

Surface Water Quality Up-gradient from Historic Mining Operations Upstream Errol L. Montgomery & Associates, Inc.

Surface Water Quality Vicinity of Historic Mining Operations Upstream from East toe East toe Downstream from East toe South toe Errol L. Montgomery & Associates, Inc.

Surface Water Quality Down-gradient from Historic Mining Operations Little Antelope Creek Downstream *Downstream Antelope Creek Errol L. Montgomery & Associates, Inc.

Sulfate Concentrations/pH April 2008 Errol L. Montgomery & Associates, Inc.

Sulfate Concentrations Errol L. Montgomery & Associates, Inc.

Water Quality Comparison 1996 and 2008 Errol L. Montgomery & Associates, Inc.

Conclusions Site is well characterized Surface and groundwater monitoring data indicate that impacts are related to historic mining operations Monitoring data also show that state-of-the-art (and unique to Nevada) engineered waste rock storage facility and stormwater management features are not contributing impacts to surface and groundwater Closure / reclamation efforts continue Errol L. Montgomery & Associates, Inc.