The Implementation of Rock Mechanics Into a Multiple Level Limestone Mine

Newman, David A.
Organization: International Conference on Ground Control in Mining
Pages: 6
Publication Date: Jan 1, 2014
In the 1950s, an underground limestone mine in the Camp Nelson Formation was developed from an outcrop exposure. The Camp Nelson Limestone met the requirements for DOT stone and aggregate. The mine ownership changed several times, which resulted in distinct mine designs in Level 1. Based upon the production requirements and an attempt to maximize limestone recovery from a single level, a variety of pillar dimensions and three mining heights (28 feet, 68 feet and 83 feet) were developed. This was sufficient prior to reaching the mineable extent of Level 1. Level 2 introduced previously unknown ground control challenges. These included: ??Pillar spalling and a significant back fall on the Level 1 - Level 2 decline; ??Laminated immediate back and the need to bolt the back on Level 2; ??Delamination of the back adjacent to the Level 1 - Level 2 decline resulting in bolt shearing, and floor heave in isolated areas of Level 2; ??Multiple level interaction, the need to design pillars based upon numerical modeling as columnization between Levels is infeasible: and ??Water inflow as the mine approached river. To meet the challenges, a testing program to determine rock strength and physical properties was implemented along with numerical (LAMODEL and FEM) modeling, and borescope inspections of the immediate back. The efforts to implement rock mechanics were re-focused as Level 2 approached its mineable limit and the initial attempt to drive a decline to Level 3 was unsuccessful. A second decline site was selected based on inter burden stability, a consistent shale parting for the Level 3 back horizon, results from numerical models of the immediate back and multiple level interactions, and the projected low water inflow. The mine is operating on Levels 2 and 3 with long-term planning and ground monitoring for Level 3.
Full Article Download:
(1746 kb)

Additional chapters/articles from the SME-ICGCM book 33rd International Conference on Ground Control in Mining

Development of the 3D Numerical Modeling of Roof Bolts for S
Development and Application of the TT Anti?Friction Washer f
A Comparison Between ARMPS and the New ARMPS?LAM Programs
Multi?stage Testing Procedures, Verification, and Results fo
The Caterpillar HW300 Quickscan
Underground Mining Technology in Chinese Coal Mines
Rock Characterization Using Time - Series Classification Alg
Ground Control in the Underground Coal Mines of Colombia
Investigating the Contributing Factors to Rib Fatalities Thr
Analyses of De-Confinement Mechanisms of Unstable Failures i
Photogrammetric Monitoring of Rock Mass Behavior in Deep Vei
Development of An Enhanced Methodology for Ground Movement P
Estimating Coal Strength Based on Historical Laboratory Test
Experimental Observations and Interpretations on Fracture Ne
Overburden Failure Characteristics of Extra?Thick Seam Using
FlexKnot: An Innovation in Roof and Rib Surface Control
Learning Our Geotechnical Limits and Pushing Our Longwalls T
Three Dimensional Analysis of Strain and Ground Surface Disp
Use of a Plate Loading Device to Quantitatively Evaluate Wea
Ground Control Design Considerations for Reducing Longwall?I
Mechanics of Horizontal Movements Associated with Coal Mine
Roof Geotechnical Properties for Roof Control Purposes in Il
Update: Analysis and Case Study of Impact?Resistant Steel Se
The Implementation of Rock Mechanics Into a Multiple Level L
A Case Study for Multiple Seam Calibration of LaModel in Bum
A Liquid Settlement System for Measuring Roof Sag During Dev
Ground Response As a Longwall Advances Into a Backfilled Rec
A Case Study of a Low Overburden Longwall Recovery with Pre?
To What Extent the Mechanical Properties of Coal Play Role i
Mine Water Vs. Drinking Water?Technical Execution and Legal
Mitigation of a Massive Sandstone Channel?s Impact on Longwa
Study on the Modified Model of Probability Integra Method
Multi?Seam Mining Over Old Workings with Small Pillars - A C
Development of Mechanized Ground Support Installation Equipm
Understanding and Optimizing the Performance of Passive Prim
Validation of Overburden Failure Zone in Complex Extra Thick
The Impact Factors of Overburden Movement in Longwall Mining
Fiber Reinforced Polymer Rockbolts for Ground Control in a S
Introduction of a Measurement Based Ground Control Managemen
Application of Various Probing Methods for Rock Characteriza
Risk Analysis and Risk Ranking in Tunneling: A Case Study
Development of Road Header Roof Bolting Module
Combined Effects of Rock Bedding Orientation and Topography
Challenges of Room and Pillar Mining at 900 M Depths in the
Sandy Creek Waterfall?Case Study of Successful Management of
Overburden Strata Movement for the Longwall Mining of Shallo
Rock Slope Stability Comparison Between Deterministic and Pr
Stability of a Gateroad Used Simultaneously for Two Retreati
Meeting the Challenges of Floor and Sidewall Strata Control
Strata Control Investigations During Fully Mechanized Coal P
Strata Movement Around Large Mining Height Face Area with Fu
A Case Study of Topography?Related Stress Rotation Effects o
Introduction of a New Superior Coating on Ground Support Pro
Suspension Designs Required in the Logical Framework
A Novel and Effective Method to Develop Tension in a Roof Bo
Time Dependent Mining Induced Subsidence Measured by Differe
Tracking and Tracing in Terms of Transportation Logistics of