ACARP ACARP ACARP ACARP
Open Cut

RAB Drill Rig Top Of Coal Detection While Drilling

Open Cut » Drilling & Blasting

Published: May 17Project Number: C21005

Get ReportAuthor: Enver Bajram, Daniel Hudson & Scott Adam | CRCMining

Accurately detecting the approaching top of a coal seam prior to blasting is fundamental to efficient coal recovery. Previous investigations by member mining companies reported a 66% reduction in coal dilution through disciplined and detailed overburden drilling and blasting practises. Through two Phases of CRCMining/ACARP funded research, CRCMining has developed a novel concept for detecting approaching Top of Coal (TOC) whilst drilling in Rotary Air Blast (RAB) over-burden blasthole drilling.

 

The method of detecting TOC while drilling brings significant benefits to key stakeholders, including - Providing a reliable indication of approach to TOC that will enable drilling to be stopped before touching coal or at a minimum standoff distance. - Increase production by reducing damage to coal from blasting.

 

The first phase of research investigated injecting an electrical signal into the drill bit and measuring single point resistivity at the drill bit while drilling. Early concepts were based on a 2.4GHz wireless communications path through the drill string to send resistivity measurements to the surface for subsequent data analysis. As this concept developed it became apparent that it was a complex and delicate system, with a number of significant practical limitations, including battery life, long term survivability and a dependency on in field support. Although demonstrated during lab testing, wireless communication up through the drill pipe proved to be problematic due to internal profile variation in the drill pipes causing attenuation in the returned signal.

 

An internal review of the project at CRCMining lead to the refocus of Phase 2 of the project to a simpler, elegant concept solution. A cornerstone of the concept involved relocating the complex, fine measurement electronics out of the drill bit and implementing them into the cab of the drill rig where environmental factors no longer became a factor. This also removed the need for wireless communications up through the drill string as all measurements are now done on the surface rather than at the drill bit. During this phase a system was designed and developed and trialled in the field at Jellinbah Mine in North Queensland. Results from this field trial proved that the coal seam could be detected using the phase 2 system, however due to a critical component failure in the research prototype, the full experimental program could not be completed. The system did however reliably and clearly detect coal interface despite a high signal to noise ratio, which is suspected to be associated with the failed critical component.

 

Related project reports also available from the ACARP website are C19023 and C24064.

Underground

Health and safety, productivity and environment initiatives.

Underground

Open Cut

Safety, productivity and the right to operate are priorities for open cut mine research.

Recently Completed Projects

C19024Establishing Ecologically Sustainable Mine Water Release Criteria In Seasonally Flowing Streams

Extreme rainfall conditions in the Fitzroy Catchment over an approxi...

C25030Coal Mine Open Pit Final Void Closure And Relinquishment - Addressing Uncertainty In Coal Mine Environmental Planning

This report addresses uncertainties faced by coal mine operators whe...

C27046Estimation Of True Deformation Vector From Slope Radar Monitoring

Slope deformation radar monitors are now widely used in open cut coa...

Open Cut

Coal Preparation

Maximising throughput and yield while minimising costs and emissions.

Recently Completed Projects

C27004Improving Coal Flotation With Oscillatory Air Supply

This report provides detailed information on coal flotation with os...

C25018Improving Solids Recovery And Moisture Reduction In Ultrafine Coal Dewatering

This report provides detailed information on fine coal dewatering in...

C27028Lab Froth Flotation Testing Guide With Coal Quality

Correct outcomes from laboratory froth flotation testing in coal bor...

Coal Preparation

Technical Market Support

Market acceptance and emphasising the advantages of Australian coals.

Recently Completed Projects

C26039Nanoporosity In Cokes: Their Origin, Control And Influence On CO2 Reactivity

This project using the outcomes of previous project C24060, examine...

C28063A Comprehensive Technical Review Of High-Efficiency Low-Emission (HELE) Pulverised Coal Combustion Technologies For Power Generation

Research and development has been undertaken worldwide to realise co...

C28064Carbon Structure Transformation During Coking Of Australian Coking Coals: Better Understanding The Coke Formation

Carbon structures of coke that are formed during the plastic layer a...

Technical Market Support

Mine Site Greenhouse Gas Mitigation

Mitigating greenhouse gas emissions from the production of coal.

Recently Completed Projects

C28076Selective Absorption Of Methane By Ionic Liquids (SAMIL) - Phase 2 Demonstration In A Packed Bed Reactor

An alternative approach to high temperature oxidation of ventilation...

C26004CFD Modelling Of Reverse Thermal Oxidisers For VAM Abatement - CFD Modelling Of Fixed-Bed RTO Devices

The project is part of a larger multi‐phase program of study a...

C27058Technological Assessment Of A Recycle Reactor For VAM Abatement

Underground coal mining emits high volumes of methane, diluted in ve...

Mine Site Greenhouse Gas Mitigation

Low Emission Coal Use

Step-change technologies aimed at reducing greenhouse gas emissions.

Recently Completed Projects

C17060BGasification Of Australian Coals

Four Australian coals were trialled in the Siemens 5 MWth pilot scale ga...

C17060AOxyfuel Technology For Carbon Capture And Storage Critical Clean Coal Technology - Interim Support

The status of oxy-fuel technology for first-generation plant is indicate...

C18007Review Of Underground Coal Gasification

This report consists of a broad review of underground coal gasification,...

Low Emission Coal Use

Mining And The Community

The relationship between mines and the local community.

Recently Completed Projects

C16027Assessing Housing And Labour Market Impacts Of Mining Developments In Bowen Basin Communities

The focus of this ACARP-funded project has been to identify a number...

C22029Understanding And Managing Cumulative Impacts Of Coal Mining And Other Land Uses In Regions With Diversified Economies

The coal industry operates in the context of competing land-uses that sh...

C23016Approval And Planning Assessment Of Black Coal Mines In NSW And Qld: A Review Of Economic Assessment Techniques

This reports on issues surrounding economic assessment and analysis ...

Mining And The Community

NERDDC

National Energy Research,Development & Demonstration Council (NERDDC) reports - pre 1992.

Recently Completed Projects

1609-C1609Self Heating of Spoil Piles from Open Cut Coal Mines

Self Heating of Spoil Piles from Open Cut Coal Mines

1301-C1301Stress Control Methods for Optimised Development...

Stress Control Methods for Optimised Development and Extraction Operations

0033-C1356Commissioned Report: Australian Thermal Coals...

Commissioned Report: Australian Thermal Coals - An Industry Handbook

NERDDC