TLDs placed between with each bunch block located close to the collar of the blasthole which delay.
2) Each block must point in the direction of firing ie. with its detonator pointing towards the next blasthole collar).
3) TLDs can provide a time delay between groups of blastholes, or individual blastholes
4) It is possible to achieve a wide variety of initiation sequences and firing times.by suitable choice of TLD and in-hole delay combinations