abandoned underground mines in ohio – aumira database ... · abandoned underground mines in ohio...

Abandoned Underground Mines in Ohio – AUMIRA Database Population Project

Eric Kistner and James R. Swindler Jr.Stantec Consulting Services Inc.

August 3-5, 2010Appalachian States Coalition for Geohazards in Transportation

Presentation OutlineAbandoned Underground Mines in Ohio –AUMIRA Database Population Project

I. IntroductionII. Site IdentificationIII. Site GroupsIV. Database PopulationV. Remediation Cost EstimatingVI. Results/Statistics

I. IntroductionODOT Inventory Projects

• Rockfall• Landslides• Karst• Abandoned Mines

– AUMIRA = Abandoned Underground Mine Inventory and Risk Assessment

– Process published in 1998 manual

I. IntroductionWhy was AUMIRA process developed?

• Eastern Ohio mined extensively for coal• Problems with past mine subsidences

– Highway closures– High repair costs

• A need to be proactive– Public Safety– Budgetary Mechanism– Informational Resource

II. Site Identification

ELP

BLP

III. Site Groups

Appropriate Site Evaluation ScoreInactive

File

Eliminated Site Group

High Rating Group

Low Rating Group

Surface Deformation

Group

Mine Opening Group

Simplified AUMIRA ProcessInitial Evaluation

No Mapped or Observed

Mining Features

III. Site GroupsSurface Deformation Group

III. Site GroupsMine Opening Group – Drift Entry

III. Site GroupsMine Opening Group – Slope Entry

III. Site GroupsMine Opening Group – Air Shaft

III. Site GroupsMine Opening Group – Main Shaft

IV. Database PopulationSite Features – GPS Points

IV. Database PopulationInitial Site Evaluation

IV. Database PopulationHigh Rating Evaluation

IV. Database PopulationMine Opening Evaluation

IV. Database PopulationSurface Deformation Evaluation

V. Remediation Cost Estimating

• ODOT RCDA – Remediation Cost Database Application• Web based tool developed for ODOT by OSU• Mine remediation, landslides, rockfall• High Rating, Mine Opening, or Surface Deformation Sites• There are three scenarios for the RCDA Application:

• Excavate and Fill – less than 40 feet overburden• Drill and Grout – overburden between 40 and 100 feet• Land Bridge – overburden greater than 40 feet Surface

Deformation sites• Can be used separately or in conjunction with one another

V. Remediation Cost EstimatingExcavate and Fill Scenario

Input Parameters:•Average roadway elevation•Average elevation of top of rock•Average elevation of mine void floor•Average mine void thickness•Angle of draw•Width of pavement•Length of highway above mine void•Primary mining percentage removal•Secondary mining percentage removal•Lateral distance of excavation•Soil cut angle•Rock cut angle

V. Remediation Cost EstimatingDrill and Grout Scenario

Input Parameters:•Average roadway elevation•Average elevation of top of rock•Average elevation of mine void floor•Average mine void thickness•Angle of draw•Width of pavement•Length of highway above mine void•Primary mining percentage removal•Secondary mining percentage removal•Barrier grout hole spacing•Production grout hole spacing•Percent of grouting by pressure/tremmie feed•Percent of grouting fluid/air /sonic rotary method•Percent of grouting by inclined methods

V. Remediation Cost EstimatingLand Bridge Scenario

Input Parameters:•Average roadway elevation•Average elevation of top of rock•Average elevation of mine void floor•Average mine void thickness•Angle of draw•Width of pavement•Length of highway above mine void•Primary mining percentage removal•Secondary mining percentage removal•Total bridge length•Total bridge width•Maximum ground collapse length•Thickness of bridge slab•Length of grouted areas (if needed)

VI. Results/Statistics – Roadway Miles Underlain by Mines

• State: 8,425 Roadway miles;495 miles (13%) underlain bymines.

• County values range fromless than less than onepercent to 40 percent.

• Belmont County: 291 roadwaymiles; 116 miles (40%)underlain by mines.

• Jefferson County: 175roadway miles; 48 miles(27%) underlain by mines.

VI. Results/StatisticsStatewide - Site Group Breakdown

VI. Results/StatisticsStatewide – Initial Evaluations

144

443

261

157

109

49

132

0

50

100

150

200

250

300

350

400

450

Num

ber

Scores

Statewide Initial Evaulation Scores

VI. Results/StatisticsStatewide – Initial Evaluations

State0

50

100

150

200

250

300

350

400

450

Initi

al E

valu

atio

n Sc

ore

• Denotes Median of Initial Evaluation Scores

Statewide Initial Evaluation Scores

VI. Results/StatisticsStatewide – High Rating Evaluations

16 17

32

44

67

55

48

21

11

41

0

10

20

30

40

50

60

70

Num

ber

Scores

Statewide High Rating Evaluation Scores

VI. Results/StatisticsStatewide – High Rating Evaluations

State0

100

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400

500

600

700

800

Det

aile

d H

igh

Rat

ing

Scor

e

• Denotes Median of Detailed High Rating Evaluation Scores

Statewide High Rating Evaluation Scores

VI. Results/StatisticsStatewide – Mine Opening Evaluations

5

57

42

23 22

39

15

4 42

42 1

0

10

20

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40

50

60

Num

ber

Scores

Statewide Mine Opening Evaluation Scores

VI. Results/StatisticsStatewide – Mine Opening Evaluations

State0

200

400

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800

1000

1200

1400

1600

1800

Det

aile

d M

ine

Ope

ning

Sco

re

• Denotes Median of Detailed Mine Opening Evaluation Scores

Statewide Mine Opening Evaluation Scores

VI. Results/StatisticsStatewide – Surface Deformation Evaluations

11

22

12

76

4

1 1

0

5

10

15

20

25

30

Num

ber

Scores

Statewide Surface Deformation Evaluation Scores

VI. Results/StatisticsStatewide – Surface Deformation Evaluations

State0

100

200

300

400

500

600

700

800

900

1000

Det

aile

d H

igh

Rat

ing

Scor

e

• Denotes Median of Detailed Surface Deformation Evaluation Scores

Statewide Surface Deformation Evaluation Scores

VI. Results/StatisticsStatewide – RCDA Cost Estimates

Scenario

AverageRemediation Cost

Per Lane Mile(Thousand $)

Excavate and Fill 482

Drill and Grout 2,035

Land Bridge 1,741

Total 1,602

Summary• AUMIRA has been an effective method to

inventory mapped abandoned mine sites.• Sources of error:

– Presence of unmapped mining– Inaccurate mapping/georeferencing– Incomplete information about mines

• Cost remediation tool low compared to actual past construction costs

• Status - Inventory process is complete; implementation not started.

Thank you.Questions?

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