CMRR Ratings You Can Defend with Confidence
When roof conditions change and support designs have to justify themselves, one-click scenario comparison beats three weeks of spreadsheet archaeology.
What's Actually at Stake
A CMRR miscalculation doesn't just delay your report. It cascades into support design. Into contractor scope.
Into the safety case that sits in front of regulators.
When someone asks "how did you get that number?", you need an answer that isn't "column D, I think."
Designed for Mining Geotechnical Engineers
CMRR-io simplifies the complex process of coal mine roof stability analysis, helping you make safer, data-informed decisions. Implements the Molinda & Mark (1994) NIOSH CMRR methodology with full unit rating, roof rating, and adjustment factor support—including automated moisture sensitivity deductions for clay-rich strata.
Audit Trail Built In
Every input, adjustment, and assumption logged. When your calculation gets reviewed (and it will), you'll know exactly why you chose 1.8m bolts over 2.1m.
Scenario Comparison in 2 Clicks
Bolt length × roof type matrix. Stone roof vs coal roof. Run them all simultaneously—no copy-paste, no broken cell references.
Same Methodology, Every Time
No more 'which version of the spreadsheet did they use?' Standardised calculations across your entire team and all mine sites.
CMRR Analysis Workflow Steps
Add Roof Units
Define your roof rock mass units with geological, geomechanical, geophysical & hydrogeotechnical data.
Calculate CMRR
Easily duplicate CMRR analyses to assess multiple scenarios (e.g., 1.8 & 2.1 m bolt lengths for both stone & coal roof scenarios).
Audit Analysis
Review and validate CMRR calculations, ensuring accuracy and identifying potential errors or inconsistencies.
Share & Export
Review results, export PDF/CSV reports & collaborate with your team.
CMRR Analysis in the Cloud
Eliminate complex spreadsheets and isolated data sets. CMRR-io brings sophisticated Coal Mine Roof Rating analysis to a user-friendly, collaborative platform.
From Bolt Length to Seam Type
Query any dimension across your CMRR analyses
CHART-io is completely free and can be used with CMRR-io. No additional licences, no hidden fees.
Compare roof ratings across seams, locations, or bolt configurations with intuitive filtering and grouping.
- —Visualise how different bolt lengths or roof types affect CMRR ratings. Spot optimal configurations at a glance.
- —Filter by seam type, depth, or geological conditions to understand spatial variations across your mine.
- —Export publication-ready charts for mine planning documents and safety reports.
Everything You Need for Geotechnical Roof Stability Analyses
CMRR-io offers a complete suite of tools designed specifically for coal mine geotechnical engineers.
Upload Data & Info
Upload supporting borehole data & information (e.g., drillcore photos, lithology logs, LAS geophysics, field & laboratory test reports, etc.)
Export PDF & CSV Reports
Generate professional reports with CMRR inputs, calculations & assumptions. Export as PDF/CSV for sharing or inclusion in geotechnical reports.
Real-Time Collaboration
Work seamlessly with and within your team. Review, edit, and approve CMRR analyses with ease.
Cloud-Based Access
Securely access your data from anywhere — no need for dongles, executable files or server-based software licenses (all you need is an internet connection).
User Access & Permissions
Assign specific roles and privileges at the user level to ensure everyone has the appropriate access to features and data.
Mobile-Responsive
Perform CMRR analyses on any digital device — mobile, tablet, laptop, desktop
Benefits of Cloud-Based CMRR Analysis
Scenario comparison in 2 clicks
Bolt length × roof type matrix. Run 1.8m and 2.1m bolts for both stone and coal roof scenarios simultaneously.
PDF export that matches exactly what your client sees in-app
No reformatting. No screenshot-and-paste. Professional output ready for inclusion in geotechnical reports.
Eliminates version control issues
When three people touch the same analysis, you'll know who changed what and when. No more "CMRR_Final_FINAL_v2_USE_THIS.xlsx".
Pricing
Scalable, fair pricing that grows with your projects - for engineering consultancies & mining companies alike.
CMRR-io Base Subscription
Includes 3 active projects
Per Additional Active Project
Features Included:
- Unlimited users
- Unlimited boreholes
- Duplicate CMRR analyses
- Upload data & info
- Export results (PDF & CSV)
- Cloud-based access
- Secure database
- Priority support
Example Pricing Setup
Billed annually (save AU$1,262/year)
No credit card required
Run Your First CMRR Analysis—Free
Import your own borehole data. See scenario comparison in action. 14 days, full access, no credit card.
Frequently asked questions
Everything you need to know about CMRR-io
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