Welcome to the Forum - posts for discussion

Drill Blast Limitations in Underground Coal Mines

Posted by Ümit KILIC on November 10, 2022 at 14:39

Dear All,

There was a firedamp (methane+air mixture) explosion in one of the UG coal mine in Turkey and 41 miners dead last month. The ignition source is still unknown.

There is no detail limitaitons for blasting in UG Coal Mine in Turkey (like total delay time, max charge quantity, max hole depth, etch.). As far as I know there are some limititaitons in the USA like;

- Hole spacing in coal is 60cm and is 46 cm in other formations

- MAx charge per hole: 3 pound (1,36 kg) in coal

- Max hole number per blast: 20 pieces (more hole depends on MSHA permission)

- Max delay time: 1000 ms

- Delay between holes: 50 ms and 100 ms

Could you please share limitations like in the USA for discussion.

Best regards.

drill blast in ug coal mines

★

Votes: 0

E-mail me when people leave their comments –

You need to be a member of Mining Industry Professionals to add comments!

Join Mining Industry Professionals

Comments

Ph.D. Natalia Petrovskaya July 21, 2023 19:20

Hello Miners are dying in all countries. There are many control systems. They turn off the security systems themselves, otherwise the mine will be closed.

Resultados de traducción

Traducción

Hello Miners are dying in all countries. There are many control systems. They turn off the security systems themselves, otherwise the mine will be closed.
Kim Henley July 6, 2023 13:24

Regulations in Australia are a lot more restrictive:

https://www.resourcesregulator.nsw.gov.au/sites/default/files/docum...

https://www.resourcesregulator.nsw.gov.au/sites/default/files/documents/types-of-explosives-for-use…