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Jul 30, 2023 19 likes •330 views

Eric Dougherty, Chief Engineering Geology Division Presentation: Historical and Recent Abandoned Underground Mine Roadway Mitigation in Maryland ITGUAM 2013 Presentation Outline: Mineral Mining in Maryland Coal Mining in Maryland -Historical

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Eric Dougherty, Chief Engineering Geology Division

Presentation: Historical and Recent Abandoned Underground Mine Roadway Mitigation in Maryland

ITGUAM 2013

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Presentation Outline: Mineral Mining in Maryland Coal Mining in Maryland -Historical

Recent

Abandoned Mine Issues of Common Interest to Bureau

f Mines

Winding Ridge AMD Demonstration Availability of Abandoned Mine Maps

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Underground mines for copper, chromium, iron, calcite, green marble Area of underground mines for fire clay and coal

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Underground mineral mining examples: Mineral Hill – iron and copper (inactive) Soldier’s Delight – chromite (inactive) LeFarge Texas – calcite – underground workings on the southern end, under roads (inactive underground). Not really a concern - have encountered spoil piles with roadway construction.

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From: USGS SIR 2010-5152

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FROM: MGS

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Review of Coal Mining in Maryland: *

Coal mining in western Maryland started in 1700s * Underground (deep) mining started in 1820s * Coal mining increased with arrival of B&O railroad (1842) and C&O Canal (1850) * Peak coal production in 1907 * By 1941 most of underground coal mines abandoned * Approximately 450 abandoned underground coal mines identified that pre-date SMCRA-1977

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Some items that have occurred during highway construction and operations associated with underground coal mines,

1. Need to undercut (I-68)
2. Slope failure (Md Rt 36)
3. Rapid dewatering of mine (Md Rt 657)
4. Need to change alignment due to unstable spoil (gob)

piles/slopes (Md Rt 36)

5. Need to grout to control subsidence (MD Rt 936)
6. Settlement monitoring (MD Rt 50)

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MD Rt 36 Mt. Savage Slide, 2005 Map images from: Mine Drainage Abatement Investigations, 1974, Green Associates Inc., and Gannett Fleming Corddry and Carpenter Inc. for Md DNR

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MD Rt 36 Mt. Savage, 2005

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MD Rt 36 Mt. Savage

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Md Rt 36 Mt. Savage rock buttress

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I-68, undercut during construction to eliminate abandoned coal mine

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I-68 Undercut during construction to eliminate abandoned coal mine

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MD Rt. 936 Grouted to eliminate abandoned coal

mine. Funded by Bureau
f Mines, Contracted by

SHA.

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MD Rt. 657 Rapid dewatering flooded/undercut roadway

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MD Rt 657 Rapid Dewatering 2010

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MD Rt 657 Rapid Dewatering, 2010

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MD Rt 36 Relocated, slope failure

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Md Rt 36 Westernport, Taylor Slide, abandoned mine openings

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MD Rt 36 Westernport, Taylor Slide, Stone Buttress

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Underground mine drainage at Westernport – Taylor Slide

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Winding Ridge –Frazee Mine - closed Casselman Mine -

perating

Mettiki Mine - closed Taylor #1 Mine – operating Steyer #2 Mine –

perating

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Abandoned Mine Drainage Repair – note water level stain on roof

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Slide Repair

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Stream Erosion and Restoration

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Gob Pile – on fire

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No known mine maps. Field investigation conducted– estimated 3,900 yds void. When grouted used 5,600 yds, encountered unknown mine voids that prevented complete filling of mine with grout. http://esm.versar.com/pprp/bibliography/PPR P-124/PPRP-124_WR_Report.pdf

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Availability of Abandoned Mine Maps:

Frostburg University Mine Map Program at J. Lewis Ort Library MDE-Bureau of Mines web site for abandoned mine locations: http://www.fereshteh.net/student/mine_mapping/index.htm http://www.frostburg.edu/minemapping/ http://www.mdminemaps.org/mining/main.html

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THE END Questions?

Koontz Mine, Lonaconing, Maryland