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STATUS REPORT ON INOPERA TIVE M INES
L I N D S A Y W H A L I N , M S , P G
E N G I N E E R I N G G E O L O G I S T
G R O U N D W A T E R P R O T E C T I O N D I V I S I O N
S A N F R A N C I S C O B A Y W A T E R B O A R D
M A R C H 9 , 2 0 1 6 M E E T I N G
Mine Cleanup Program
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Talk Outline
Region 2 inoperative mines
Water quality impacts
Program history
New tools/data aid prioritization
Regulatory tools
Next steps
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AND POTENTIAL IMPACTS ON WATER QUALITY
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Mines in Region 2
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Inoperative Mines in Our Region 4
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Mine Water Quality Impacts
Discharges to water of:
Sediments eroded from mine site
Toxic contact-water (including acid mine drainage)
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Leona Heights Sulfur Mine
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Mine Water Quality Impacts
Discharges to water of:
Sediments eroded from mine site
Toxic contact-water (including acid mine drainage)
Eroded mine site soils contaminated by processing of ore
Eroded waste rock
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Mine Water Quality Impacts
Discharges to water of:
Sediments eroded from mine site
Toxic contact-water (including acid mine drainage)
Eroded mine site soils contaminated by processing of ore
Eroded waste rock
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Leona Heights Sulfur Mine
Gambonini Mercury Mine
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Mine Water Quality Impacts 8
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Mine Water Quality Impacts 9
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INVENTORY, PRIORITIZATION &
SUCCESSFUL CLEANUPS
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Previous Efforts
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Previous Efforts 11
1990’s Mine Cleanup Program Development 196o’s USGS Mine Inventory
Prioritized by impacts to water quality
1998 Mines Report Inspected remaining mines
Prioritized by impacts to water quality
Mercury mines and those with acid mine drainage identified as highest priorities
Unable to locate some mines/features
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Previous Efforts 12
2007 to present - Mercury TMDL efforts San Francisco Bay
Tomales Bay
Guadalupe River Watershed
Walker Creek, Soulajule Reservoir and Tributaries
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Successful Cleanups 13
Gambonini (Marin) - mercury
La Joya (Napa) - mercury
New Almaden (Santa Clara) - mercury Mine Hill, Hacienda Furnace Yard, Jaques Gulch, Hicks Flat, San Mateo, Enriquita, San Francisco Open Cut, and Senador, plus portions of Alamitos Creek and Deep Gulch
Challenge/Stulsaft (San Mateo) - mercury
Leona (Alameda) -
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Mine Cleanups In Progress 14
San Jose
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NEW TOOLS AND NEW DATA IMPROVE INVENTORY AND
PRIORITIZATION
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35+ Mines Not Addressed in Previous Efforts
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Basin Plan Strategy
Mine Cleanup Program
Identify all mines and mineral production sites
Prioritize sites based on existing and potential impacts to
water quality and size
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Unaddressed Inoperative Mines (that we know about)
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Mercury – 14 Manganese – 11 Coal – 3 Copper – 2
Magnesium – 2 – 1
Silver – 1 Chromium – 1
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Current USGS Mineral Resources Database
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New Tools 19
Image from Icons-Land
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Inspections are Laborious 20
Carrie Austin at Bella Oak
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Satellite Reconnaissance
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Satellite Reconnaissance 22
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Satellite Reconnaissance
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Surface Water Flow-Lines 24
Spring Flow-Path
Potential Mining Waste
Pile
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Surface Water Flowpath 25
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Water/Habitat Quality Databases 26
Lake Herman
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Water/Habitat Quality Databases 27
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Water/Habitat Quality Databases 28
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Water/Habitat Quality Databases
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Prioritization Ranking System 30
Factors Affecting Water Quality
Weighted Ranking Exacerbating Factors +, ++, …
Mitigating Factors –, ––, …
Summed for total rank
Higher = Larger potential water quality threat
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Early Indications are Promising
Inspection priorities changing, a bit Example - Bella Oak moved down in priority
Large distance to surface water
Other mines closer to surface waters, impaired receiving waters
Discovered mines and features (waste piles) not identified in previous efforts
Drainage pathways, receiving waters corrected
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Current Mine Inspection Priorities
Mercury Highest priorities = Hastings, St. John’s & Corda Some medium, only a few low priority
Alma (Alum) – Mine recently located
Chromium Newman – Possible immediate human health concern
(inhalation)
Acid Mine Drainage associated with hard rock Palisade - Silver Union Gulch – Copper
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After the Desktop Prioritization
Inspection
Preliminary site characterization
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Handheld XRF Analyzer, Olympus
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After the Desktop Prioritization
Reprioritize mines FOR CLEANUP by identified impacts to water quality
Start cleanup process where worst water quality impacts identified
At each mine: Focus on projects that maximize water quality benefit
Implement interim measures for immediate risks and to expedite results
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New Effort Tasks 35
Collate existing sources of info/data into Excel table
Resolve discrepancies
Add additional sources of new data
Identify mines with potential to impact water quality
Prioritize by ranking according to weighted factors, water quality impacts
For inspection/preliminary characterization
For full site characterization and cleanup
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Regulatory Tools and Next Steps
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Regulatory Tools Provide Flexibility
Water Code section 13267 – Require investigations
Cleanup and Abatement Order
Waste Discharge Requirements
NPDES Industrial Stormwater Permit
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Next Steps
Keep you informed
Report findings
Update Basin Plan
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Acknowledgements
Thanks to: Carrie Austin Keith Roberson Terry Seward Dyan Whyte Tamarin Austin Bruce Wolfe Sarah Acker Corie Hlavaty Kristina Yoshida Melissa Gunter Christina Toms Alyx Karpowicz Anna Torres Jamil Adler & Glenda Marsh
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“Freddie Mercury” by Pablo Bustos